Solar Versus Wind Power: Which Has The Most Stable Power Output?

Due to the larger magnitude of solar PV power output fluctuations relative to those of wind at time scales shorter than approximately 31⁄2 hours, the costs of large scale solar PV integration are likely to be larger than those of wind.via Treehugger

Posted by ewilhelm 10 years ago


Small PV Solar Cell Charger Questions

I volunteer as a ski patroller at a ski resort in northern Vermont.  Like many other ski resorts, we monitor Family Radio Service (FRS) Channel 9-11 for skiers who might get lost or hurt within our resort's boundary or sometimes outside the resort boundaries.  Due to the FCC restriction that FRS channels are limited to only a half watt (0.5w) they have very limited range.  So in order to monitor channel 9-11 effectively, we keep FRS radios plugged in all over the mountain in all of our ski patrol huts where there are always patrollers on standby in case of injuries or lost skiers.  One of our huts does not have any electrical power, so we are constantly cycling freshly charged radios to and from that hut, almost every day.  It would be a lot less of a nuisance if we could charge that radio with solar power.   On the wall outlet plug for charging station for the radios we use, the label says the power output from the ac/dc adapter says it outputs 9VAC 200mA.  I assume this means 9 volts alternating current at 200 milliAmps.  Could I simply find a PV solar cell that outputs 9 volts a/c and connect it to the wire that runs into the radio charger?  Most of the PV cells I found online have a watt rating, but I'm not sure if that matters or not.  Where is a good place to find a specific PV cell for this purpose, for reasonable price? If anyone person in the Northeast is able to offer significant help for this, I could probably take care of one free lift ticket for your time and help.  I'm also posting an image of the wall outlet plug label and charging station. Thanks, David

Posted by dtepper 6 years ago


a very hot 9V

Alrighty, sorry for the noob question, but i am very very new to this, i'm tryin hook 3 10mm LEDs to run off a 9v battery, i hooked it via the LEDcalc with correct resistors, it works just fine, but when i try to add a on/off switch into the mix the 9V gets very very hot. could it be ... the switch i am using... the 24 gauge wire to connect it all.... how i have connected the on/off switch into the mix , instead of connecting it straight to a battery i have added extra wires and put the switch in between the battery and the start/end of the LED chain... should i bump it down 6v instead with the correct resistors instead of the 9v also if you could explain why the 9v was heating up so much that would be great too....

Posted by pixelglasses 10 years ago


Build PV solar panels from broken solar cells

The sun's energy may be free, but solar panels can be quite expensive.  Still hoping to get off the grid? VIRON has a great Instructable, How to make PV solar panels, teaching how to make your own from broken or surplus solar cells! From the introduction: In essence, this involves ways to connect cells, which may produce more or less than one volt, and not only try to increase power output but also decrease the load, that is, efficiently conserve the energy whether it is meager or significant. For example, even the weakest solar panels can run watches, calculators, radios, charge batteries, and if a computer were specifically designed to, it would be as solar-powerable as a calculator. Check out the Instructable for info on finding and foraging usable solar cells, instructions on preparing different types of broken cells, tips for getting more power out of your panel, and instructions for wiring the whole thing up to power your devices. Inspired? Planning to try piecing your own solar panels?  Already off the grid, and planning something even better?  If you do, be sure to post an Instructable so the rest of us can learn something new. This post has been sponsored by Pepsi. The Pepsi Refresh Project celebrates the people, businesses, and non-profits with ideas that will have a positive effect on our world.

Posted by canida 8 years ago


linear strip photovoltaic panels

Hi, I was wondering if anyone knew where I could find strip PV (photo voltaic) panels. I have small pv panels 3in by 3in but i am looking for longer strip pv panels maybe an inch long by however thanks Jon

Posted by gwydionn 6 years ago


Wiring Multiple Turbines and PVs

Just a little worried... how do ya'll go about wiring multiple power sources together? I have been long under the assumption that your solar array will only put out power of the weakest panel. If I come across 3 different 12v panels, that have differing amperages, and have a wind turbine on a 12v car alternator, that ranges in power output, how can I wire these to make these most effective? Is there a charge controller out there that can manage multiple power sources? Pardon me if this is stupid. I just cant seem to get off the ground with these simple questions. i guess the most effective q to ask is: What do you do to wire multiple power devices of different outputs into a single battery bank/ grid tie system? Thanks so much for all yall's brilliant help. -Luke.

Posted by ineclipse 7 years ago


Hacking the PV Solarpower into a mere electrical outlet plugger

Is it possible with system of PV solar panel (and inverter to convert dc into ac current) with reasonable amount of power to reduce electrical bill simply by plugging it into the house electrical outlet instead of complicated wiring into the house? I want to see if it possible to share solar power panel sitting in the front yard with neighbor by taking turn with use of plugging it in the house outlet

Posted by Engineer my brain 10 years ago


Battery Charging Light Circuit

Dear All I am building a small scale PV system and I want to implement a circuit that will allow a LED to light up when the battery is being charged from the PV cells Currently I have a general purpose PNP transistor with a 2KOhm resistor for the base and a 1KOhm resistor in series with the LED, however when running this simulation the LED will not light, even when I lower the values of the resistors Any help would be much appreciated 

Posted by EmptyCoffin92 4 years ago


Agua-luna solar panel ripoff

I bought a manual from Aqua-luna.org about making solar panels. I've been misled and ripped off. The first two solar panel technologies are not viable for home power generation. The screen printed PV panels may be. There were listings of materials and a copy of a patent application along with some hand written notes. Not much else. There's absolutely no way that a person with electrical and fabrication skills could make printed PV panels from this document. I tried there msn address, no response. I posted a message in their forums, no response. Beware.

Posted by daveh189 9 years ago


PWM to MPPT solar Charge Controller

I have an Hybrid Solar Inverter with 50A PWM solar charge controller inbuilt into it. It works on 24V battery bank. I am having 800Watt of PV module installed in the system. As my inverter is having PWM charge controller, I am not able to harvest maximum of power from panels. I want to know that, is there any arrangement or device which can be put in between PV panel and my Inverter which can increase efficiency or can act as PWM to MPPT converter for my Inverter? My Solar Pannels generates often 39V but I couldnt utilize the surplus power as it stepped down to 24 Volt.

Posted by Shashi BhushanS 3 years ago


How much psi can these objects hold...

How much psi can a: 1. Coke Bottle 2. PVC Pipe 3. Metal Pipe safely hold? Is there a formula that I can use to calculate any vessel's psi capacity? Thank You!

Posted by La Tour Rouge 8 years ago


The Eco Powerplant

  Creating a Permanent IcePack in the Eastern Sierra A permanent Ice pack in a north south valley of the Carson Basin could insure constancy of water supply to Fallon area farmers and ranchers. Creating a permanent icepack in Northern Nevada is technologically and economically feasible, given the right location . This project will be solar powered, and serve as a peaking unit during times of high electrical demand. This technology will produce energy from solar by PV Panels mounted on a giant spanning grid over a north south valley in the eastern Sierra. A properly excavated mine could also serve as a location. Proximity to gas distribution and an electrical sub line are also important . This facilities' economic importance as a producer of LNG from surplus stock cannot be overstated. The upper part of the oval consists of a space grid spanning the valley or excavation. It is covered with steerable PV panels. The PV panels may be inserted into the grid or used to create liquid air , which in turn can be used to produce LNG. The thermal energy storage as liquid air would be contained underground in the mountainside itself.In Northern Nevada, these mountains are usually solid rock formations imbedded in sandy detritus, an excellent insulating material. Vast amounts of wind power are also available during spring and summer.   During summer peak demand, liquid air could be re expanded to run generators.   And most importantly , this plant will produce as a by product of its operation large amounts of water in the desert by freezing the ground on which it operates. Wet air passing over an expanse of frozen mountain rock will condense, and either form ice or rain. The production and maintenance of a liquid air production and re-expansion facility will also produce large amounts of water during times of high humidity.   Suitable locations in the Eastern Sierra would by necessity by close to either the Truckee or Carson River Basin.    

Posted by Mud Stuffin 5 years ago


Lost the wind generator here

I saw an instructable about a wind generator here last month. I bookmarked it to show to a friend so we could build it. Now I go to show it and I can't find it. I believe it was called the chispito wind generator. It features 3 blades made from big pv pipe. Can anyone tell where it went. Do they take down older instructables periodically? Can anyone tell me where I can find this if it's not on this site anymore? Thanks

Posted by diane4m 11 years ago


Can Anybody Top this Crazy Green Idea?

What is it? it's the side view of a solar peaking plant. With PV panels on the roof of a giant structure that would produce liquid air during periods of low demand, and augmented by solar work like a big energy storehouse that would be called upon during peak demand. During peak demand the liquid air would be vented into the atmosphere, causing it to snow in the desert in the summer.  It could also cause the formation of a permanent snowpack downwind of its' location.  

Posted by Mud Stuffin 5 years ago


Advice needed - DIY off-grid solar electrics DC charging via AC from generator

Hi all, new to this forum... I'm looking for some advice regarding an off-grid electrics setup i'm running. Currently i have a PV solar panel charging a battery bank through a charge controller. It's a 12vdc system. For 240vac i use a small (500W) inverter. For larger loads i use a diesel generator. The inverter is basic but very high quality sine wave, it doesn't do any charging nor does it automatically switch the load between the AC of the generator and its own AC (i do this manually). In order to recharge my batteries when there isnt enough sun (which is often!), i use a simple AC powered charger that isnt specifically designed for off-grid/solar applications. In other words it is not "intelligent" and doesnt have bulk, float or equalization settings - it's just a DC charger that gives decreasing current as the voltage of the batteries rises. In fact it is very prone to overcharging if left charging for too long and will keep putting current into the batteries even after they've reached 15.5vdc or more. My question is this: is it a good idea to feed the DC charging current from my AC-fed charger into my solar charge controller in order to allow the charge controller to regulate and/or limit the charge as appropriate? I did this for a period of time and it seemed not to cause any problems. However, my AC charger did eventually blow its recrifying diodes although i'm not sure if this was due to a separate issue with the AC power coming from my generator which at the time was an old one and may not have been giving proper AC voltage (it may have been low due to engine speed problems). The solar charge controller is a PWM type. The way i had it set up was the DC from the solar panel and the DC from the charger in parallel to the charge controller. If there is no difference between the DC from the charger and the DC from the solar panel, i don't see how there could be any problem as it amounts to the same thing as having two 12v PV panels in parellel. However, what i dont know (due to insufficient technical knowledge) is whether rectified DC is any different to the DC from a solar panel. My setup is as follows: 1 x 200W 12vdc PV panel 60A tristar PWM solar charge controller 2 x 6vdc Trojan t105 batteries wired in series to give 12vdc Mastervolt 500w pure sine wave inverter (12vdc in, 240vAC out) SDMO 6kva diesel generator (240vAC) Wolf Max 50 battery charger (AC powered 40A DC charger)

Posted by RionZion 2 years ago


No Electricity and No Stream; How Can I Move Water From Well?

I have raw land, in a State Park, which has no access to electricity or running water (stream or otherwise).  I am trying to build an aquaponics farm, however I don't have access to electricity for a well to deliver water to the system, or to the air pumps for aeration.  Any advise?  I need to know how to get water out of the well, and how to aerate the water for the fish and plants, without electricity.  I looked into Solar PV and wind turbines, and they are out of my budget. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Update *03/08/13* Thank you all for the wonderful help and suggestions.  I am going to try several of these to determine the best fit.  Also, please keep the suggestions coming, I will continue testing methods, even after setup.

Posted by msilverstein1 5 years ago


By toothbrush to the stars!

A concept known as a space elevator has been "doing the rounds" as a cheap way into orbital space for several decades now.Basically, a cable of some description is anchored to an orbiting mass, and vehicles climb up and down the cable to transport materials and passengers to and from orbital space cheaply and easily (in any space journey, the most expensive and dangerous parts of the journey are the first and last few kilometres).There are, technologically speaking, two main hurdles - the cable, and the vehicles.Carbon nanotube composites are a strong contender for the cable, but travelling up and down the cable takes power. Rockets are out of the question (what would be the point of the cable?). The hours, possibly days, of the journey make batteries unfeasible, and the turbulence of the atmosphere precludes the use of PV panels large enough to power the vehicles from daylight.That leaves transmitted power.So far, the transmission ideas have been electromagnetic - lasers aimed at smaller PV panels on the underside of the vehicles, or microwaves aimed at receiver dishes.Now, a new proposal suggests transmitting the energy mechanically.European Space Agency ground station engineer Dr Riise ... proposed sending power mechanically - effectively by providing a carefully timed jerk of the cable at its base.To demonstrate, he employed a broomstick to represent the cable held in tension, and an electric sander to provide a rhythmic vibration to the bottom of the stick.Around the broomstick's circumference he tied three brushes representing the climber with their bristles pointing downwards - meaning it took slightly more force to lower the brush assembly than to raise it.The vibration from the sander allowed the assembly to slide upward along the broomstick as it moved slightly downward, but grip it as it moved slightly upward. The net effect: the assembly rose against gravity straight to the top of the stick. That's a bristlebot (or vibrobot)! Dr Riise, though, calls it a longitudinal wave climber or LWC.It sounds easy enough to replicate the demonstration model, although I can't imagine how you would efficiently vibrate a 36,000km cable (I have images of damaging harmonics getting set up as the moving carriages change the effective length of the vibrating part of the cable, and shaking important bits off the vehicles).Apparently, though, the idea is being looked at by lift manufacturers for installation in the next generation of super skyscrapers.Demonstration videoBBC story

Posted by Kiteman 9 years ago


I have a plan ...

I have acquired, as a strict one-off, a quantity of solar cells.Apparently seconds that "work fine", the one I have unpacked is about 5 inches electrode-to-electrode, glass, and produces about 4-5V with no load in full sunlight. I assume the others are similar.A plan springs to mind. A plan to save money and be "greener". I want to use them to charge batteries during the day, then light my home with LED sources.A grand scheme, one that still requires the approval of She Who Must Be Obeyed, so I intent to take it is stages.Stage One: The Shed.I plan to install an LED light source, running off a battery charged by cells stuck to translucent panels already in my wall.Questions:what number and combination of (ordinary, cheap) LEDs would give a reasonable match for the brightness and colour of the currently-fitted 3-foot fluorescent tube?Is this a suitable circuit to charge the battery?Should I connect PV cells in series or parallel?Is there anything I should have thought of?

Posted by Kiteman 11 years ago


Solar - PV versus Solar Oven with Peltier

I was browsing the site as I am often wont to do, and spent quite some time revisiting old 'ibles covering various solar projects, almost all of which are heat related. I understand from general consensus that PV (photo voltaic) solar systems are very inefficient and one of the worst ways to harvest solar energy (when considering the cost of construction and the energy transfer capacity, etc.) Almost everyone who knows what they are doing suggest that the best (and easiest) way to harvest solar energy is to collect the heat - be it to heat air or water, cook food, or other such purposes.Now, I have recently been fascinated by a discovery relatively new to me, peltier units. These devices, for those who don't know, can work in one of three ways. They can harvest and/or produce either heat, cold, or electricity.Basically, if an electric current is run through a unit, it produces heat on one side and an equal amount of 'cold' on the other. Yes I know you can't produce cold - but for the layman, that is what we call it.Or, if one side is heated while the other side is cooled, the unit produces an amount of electricity from the difference in temperatures. One example I have seen and plan to make use of is in vehicles - if you place one or more of these on your exhaust manifold, or any other location where the engine produces waste heat, and airflow can reach it to cool the other side, you generate electricity from the waste heat energy that would otherwise just be . . . well, wasted.But it occurred to me today, if you had a unit attached in the middle of a solar collector, focusing sunlight on one side of the peltier unit, and isolate the other side of the unit in some cooling medium (perhaps even just air with a heat sink of some sort - more likely a cooling liquid though), how effective would this be at harvesting solar energy (heat) into electricity?Actually, I have been using the more common name of peltier, but I believe that for this application a seebeck unit (which is nearly the same, but different) would be required. As I understand it, Peltier units are used more as coolers and are almost always constructed with Bismuth Telluride (Bi2Te3) and used around room temperature and below; while Seebeck units are good for power generators are often constructed of PbTe or, SiGe as well as Bi2Te3 and are used at much higher temperatures.From http://en.wikipedia.org/wiki/Thermoelectric_effect :The effect is that a voltage, the thermoelectric EMF, is created in the presence of a temperature difference between two different metals or semiconductors. This causes a continuous current to flow in the conductors if they form a complete loop. The voltage created is of the order of several microvolts per degree difference.((more info can be found at the referenced wiki page on formulae etc.))Just curious on if this would ever be a decent way to harvest solar energy into electricity. I have also thought up using a thermal siphon solar heating system in which the liquid flows past one or more water wheels which power a small (and obviously slow) generator - but at that point I believe it would be so inefficient and limited in use as to just have absolutely no practical application. The peltier unit (used as a seebeck unit) would probably do better, but I am not certain, which is why I post the question.

Posted by karossii 10 years ago


Very basic electronics kits for 2 yearolds!?

My 2 year old daughter appears to enjoy the very basic geeky things that she's gotten her hands on so far.  Things like plugging headphones into the iPad to listen to music; building things with large Lego blocks; turning torches on and off; playing with little remote-controlled-cars etc etc. I'd like to see how she gets on with some sort of basic "electronics kit" which allows her to experiment a little while teaching her some very basic principals (like circuits require both a power source and a load). All existing electronics kits I've seen would be way to advanced for her.  For example, she's years away from being able to understand what "completing a circuit" means (i.e. any kits which require you to connect both a negative and positive cable from power source to actuator would be way to abstract for her). I'm thinking of making her a very, very basic "electronics kit".  Each component would be in its own little tinted, semi-transparent box. There would be several "sources" of electrical power (small battery pack, PV cells, little hand-cranked dynamo etc).  Each source module would have a single large DC socket to send power to another module.  Each source would produce about 3 volts and would have short-circuit protection. There would be several "actuator" modules like a lamp, motor, door bell, volt meter, radio etc.  These modules would each have a single small DC socket. Cables would have a large DC socket on one end and a small DC socket on the other.  The use of large DC sockets on the power source modules and small DC sockets on the actuator modules should make it mechanically impossible to create a "wrong" circuit (like connecting a battery pack to a  PV cell). And maybe some basic "control" modules like a switch, light-operated switch, oscillator etc.  Each  control module would have both a small DC socket (power input) and a large DC socket (power output to actuator). Each class of module (actuator, controller, power source) would have its own colour. My first question is: does a similar kit exist for purchase? If not, I'll make the kit for my daughter, unless anyone has good evidence that such a project would still be way to advanced for a 2 year old.  Of course, I'll start with the real basics like just a battery module, switch, light and two cables to see how she gets on with it.

Posted by jack_kelly 5 years ago


off-grid solar/wind powered greenhouse

 Hello DIYers, I am planning on building a simple greenhouse (hoop-house) this spring. The construction will be for an 8'x12'x8'H design. Building this part is wonderfully easy. The hard part is building the off-grid power to supply power to the greenhouse fans and hydroponic pump(s). I'm not sure where to start with the plans.  Here is what I am needing some guidance: Do I build a PV panel then design my electrical needs around that...or vice-versa?? (I have forty 2W solar cells on order) I know i will need batteries...how many 12V batteries do I need? Type? What is the best configuration for the batteries? Should I use a DC hydro pump or AC hydro pump? DC or AC fan for cooling? Future plans include using an arduino to be the main controller.... Please keep in mind that this is a small(ish) hobby greenhouse and I hope to build it to be fully off-grid, at least for the summer months. I have the time to build it, but don't have the know-how for fully designing it (electrical stuff confuses and scares the crap outta me). I'm not against keeping the price low, but am willing to spend a few extra bucks to make sure it's designed right.

Posted by Tweac-it 8 years ago


Generating a Couple of Watts Using Urine?

Hello, I recently came across a paper written by a researcher from a Scottish University about generating electricity directly from urine in a fuel cell and I was wondering if a larger version could be built to generate around 2 watts.  The power per square cm is around 1.5mW so even at 1mW I would need 2000 cm-sq so I think it would be easier to build a stack of cells instead of one or 2 large cells. I'd like to attach the paper but it's one which you need to pay for though I got it for free, could a moderator let me know what to do?  It was written by a Shanwen Tao and called 'A Direct Urea Fuel Cell' DOI: 10.1039/b924786f Another idea I had was to use a small PV setup to generate hydrogen from urine and then store the gas so that it can be used in a hydrogen fuel cell.  I've had some difficulty in trying a to find a cheap fuel cell but then I came across this page: http://www.mtmscientific.com/fuelcell.html Are there any really simple ways of building a fuel cell? I'm posting this here to see if anyone can help me come up with a viable design and maybe even build it for me.  I can pay you for your time and effort; though as a student I do have a tight budget to stick to. Any help, advice and ideas will be very much appreciated. Thank-You

Posted by jezym108 4 years ago


(newsletter) Build a Lightsaber, Fiber Optic Ceiling, Steampunk Laptop

Sign-up for this newsletter: Welcome back! Arduino Contest - Make anything involving Arduino and win a sweet prize from Evil Mad Science or an Arduino Mega! Closes Sunday: Digital Days Photo Contest - Show us your best photo trick, tip, or homemade gadget to win a new Sony digital camera! Winners announced: See who won the Converse Back to School in Style Contest! Coming soon: Our most awesome Halloween Contest ever! Any Instructable published since the last Halloween contest is eligible! Want a more convenient version of Instructables with fewer ads? Get a Pro Membership! Create a Fiber Optic Starfield Ceiling Bedazzler: DIY Non- Lethal Weaponry Make a Werewolf Mask Mummy Dogs Get your outfit ready!   Closes this Sunday! Steampunk Veneer Laptop Mod Non-PV Solar Power Low Cost Halloween Pop-Up Character Build a Sweet Raised Clubhouse Build a Lightsaber Quick Roast Chicken The Office Worker's Portable Solar Oven Install a Ball Valve on a Cooler See who won!   Win sweet prizes from Evil Mad Science! Make an Indoor/ Outdoor Boomerang Hand-Solder a PowerPad IC Cheap and Quick iPhone Stand Make Your Own Lathe from Trash   Now go make something awesome, and I'll see you next week! - Eric Instructables.com - 82 2nd St. - San Francisco, CA Sign-up for this newsletter:

Posted by fungus amungus 8 years ago


Advice needed on adding a Wind Turbine (generator) to a DIY PV Solar System.

I have bought a 12 volt FD-300 300 watt wind turbine to add to my 12 volt DIY solar setup. The solar setup consists of 3 home made 70 watt panels on a single axis tracker charging 6x 12 volt 85 ah batteries wired in parallel (510 ah total) through a 20 amp controller. I run a 12 volt fridge/freezer (120 liter) and my now 12 volt (was 240 volt) evaporative air cooler (cools our 3 bedroom house) off the controller load output. The wind turbine has an inbuilt regulator. The instructions for the wind turbine tell me to attach it's + and - wires directly to it's own dedicated terminals on the battery bank. This is of great concern to me. How can this be done when the batteries are already connected to each other and to my systems controller? If it can be done without damage to the batteries would I still run the appliances through the load output on my controller? Would the different charge limiters cause an issue? My controller cuts out at 13.7 volts while the turbines controller would want to allow a charge of 14.1 volts. The two controllers also have different lower limits. As you can see I'm confused and in desperate need of quality advice. Thank you for taking the time to read this.

Posted by Rob Patterson 9 years ago


Relationship between volts and amps

I'm working on a project found in this thread https://www.instructables.com/community/Solar-powered-cell-phone-charger-case-hack/ I think I'm almost ready to buy parts and start building but I have a small issue with getting the exact voltage and amperage output I need. I've been researching for hours and I can't find a simple answer to this problem. As I understand it, as voltage decreases, amperage increases to compensate and maintain wattage. Working on this basic understanding I've come up with this model. If I have a solar array consisting of 6 PV cells (1.5V 50mA ea) wired together I get 9V and 300mA. This is too much voltage and is on the low end of amps I want. If my math (and understanding of the subject) is correct, then if I use a 5V voltage regulator I will have a final max output of 5V and 433.3 mA which is right about perfect. Am I doing this right or is there more to it, like how I'm wiring the cells together? Am I correct in the idea that using a voltage regulator will increase my amp output? I'm not schooled in electricity in any way so I would appreciate any help I can get on this in as simple of a form as possible. Everything here I've put together from several hours of studying sites on solar DYI and electricity. Thanks. For reference, these are the solar cells I was referring to: http://cgi.ebay.com/High-Efficiency-Solar-Cell-32-22mm-1-5V-50mA-0-075W-/320541888508?cmd=ViewItem&pt;=LH_DefaultDomain_0&hash;=item4aa1c90ffc#ht_2428wt_1148 *EDIT* Below is a diagram of what I suspect may give me a 5V/490mAh output which would be absolutely perfect. I need to know if I can wire two different sizes of solar cells together in this manner and how it will effect the output.

Posted by HittingSmoke 8 years ago


SEMICON West 2011, July 11-15, in San Francisco

For techies who live in the San Francisco Bay area or who will be visiting here July 11th through July 15th, you may want to check out this event.  Event Dates Exhibits:                              July 12–14, 2011 Events (co-located conferences, partner events):   July 11–15, 2011 Location Moscone Center 747 Howard Street San Francisco, California (Facility address provided for directional purposes only) Show Hours Tuesday, July 12                  10:00am–5:00pm Wednesday, July 13             10:00am–5:00pm Thursday, July 14                 10:00am–4:00pm Background Founded 1971 (2011: 41st year) SEMICON West is the flagship annual event for the global microelectronics industry. It is the premier event for the display of new products and technologies for microelectronics design and manufacturing, featuring technologies from across the microelectronics supply chain, from electronic design automation, to device fabrication (wafer processing), to final manufacturing (assembly, packaging, and test). More than semiconductors, SEMICON West is also showcase for emerging markets and technologies born from the microelectronics industry, including micro-electromechanical systems (MEMS), photovoltaics (PV), flexible electronics and displays, nano-electronics, solid state lighting (LEDs), and related technologies. Major technologies served Semiconductors Photovoltaics/Solar Micro-electromechanical systems (MEMS) LEDs/Solid State Lighting Printed/Flexible Electronics Technology/product segments include Device Fabrication/Wafer Processing Equipment and Materials Deposition (CVD, PVD, ALD) Etch Ion implant Lithography Masks/reticles and mask-making equipment Chemical mechanical planarization (CMP) equipment and materials Silicon and non-silicon based wafers and substrates Process chemicals and gases Chemical handling systems Vacuum systems, components, and parts Robotic systems and components Valves, actuators, gear systems, and other components Factory automation systems, software, and components Assembly and packaging equipment and materials Wire bonding Bump/flip chip/wafer-level packaging Automated semiconductor test equipment (ATE) Test handlers Probe cards and test materials FOR MORE INFO GO TO: www.semiconwest.org

Posted by unclejoe 7 years ago


Find Your Car, Build a Letterpress, Become Mad Eye Moody...

Function clickclear(thisfield, defaulttext) {if (thisfield.value == defaulttext) {thisfield.value = "";}}Sign-up for our newsletter subscribe August 16, 2007 Welcome back!Two new contests have started! There's the Fake It, Don't Make It Contest and the Launch It! Contest. We're also excited to anounce that the Instructables Store has gone live. Check it out. Dude, where's my car? Use a magnetic pointer to remember where you put your car last night.posted by bobg on Aug 13, 2007 Portable 12V Air Conditioner - Cheap and easy! A $10 solution to a $500 solution to a $25,000 problem. posted by CameronSS on Aug 15, 2007 Easy Doughnuts Warm doughnuts on a Saturday morning are right up there with bubble baths and midday naps on the list of life's greatest pleasures.posted by RealSimple.com on Aug 16, 2007 How to Make a Woody Laptop Nothing beats the texture, look and feel of wood. Especially on a laptop.posted by trebuchet03 on Aug 14, 2007 Build a Letterpress & Use It to Print Things Save a bundle on invitation printing with this effective tool.posted by j schultz on Aug 15, 2007 Contest ends this Sunday! Share your quick and delicious recipe and get published in Real Simple! Get ready to fly. Make an Evaporative Terra Cotta Beer Chiller Harness the power of evaporation to chill your drink.posted by jolshefsky on Aug 15, 2007 How to MAKE PV Solar Panels Revive "dead" solar cells and group them to form new solar panels.posted by VIRON on Aug 13, 2007 Retouch yourself into the picture Put yourself into any scene from your favorite movie. Become Mad Eye Moody!posted by KaptinScarlet on Aug 10, 2007 How to make a cardboard stand up of someone! So you wanna make a cardboard stand up of someone? Well with a few hours and a few bucks you can make one. posted by FreakCitySF on Aug 14, 2007 Solar Thermal Water Heater For Less Than $5 Reuse some old junk and learn about renewable energy.posted by TheNaib on Aug 5, 2007 Now go build something awesome, and I'll see you next week! -Eric

Posted by lebowski 10 years ago


Instructables, Popular Science, and TreeHugger "Go Green!" Contest Results

Instructables, Popular Science, and [http://www.treehugger Treehugger] are pleased to announce the winners of the Go Green contest!The entries were fantastic- check the full list of projects as well as the winners for more great ways to green your life.Grand PrizeThe grand prize winner will receive a Breezer Liberty hybrid commuter bicycle with pedal-powered lights, an Instructables robot t-shirt, a brief write-up in a future issue of Popular Science, and a 1-year subscription to Popular Science magazine.Hydroponic Bog Garden (Water Recycling) by BiotankFirst PrizeEach first prize winner will receive a Solio Universal Hybrid Solar Charger (TreeHugger review here), an Instructables robot t-shirt, and a 1-year subscription to Popular Science magazine.Bicyle Power for Your Television by bdwhaleyGeodesic Dome Greenhouse by yes2techHow to MAKE PV Solar Panels by VIRONPortable 12V Air Conditioner --Cheap and easy! by CameronSSSolar Thermal Water Heater For Less Than Five Dollars by TheNaibSecond PrizeEach second prize winner will receive an Instructables robot t-shirt and a 1-year subscription to Popular Science Magazine.Build your own flat panel solar thermal collector by iwilltryCart Bike by zieakComposter (Drum Style) by jdlinkFree Air Conditioning by VygerGrow organic food without spending $ by gowithfloHack a Toilet for free water by gregorylavoieHow to save water in gardens and small-holdings: the Scrooge Bottle by KitemanMake an Evaporative Terra Cotta Beer Chiller by jolshefskyRecreate a Vanishing Ecosystem : The Eastern Vernal Pool by Tool Using AnimalThe Wind-up Headboard Reading Light by peterwbrownAll winners should watch their inboxes for a private message with prize-claim instructions.Thanks to our judges, who carefully read through all 63 eligible entries:arwen; canida; Dave Prochnow, PopSci; Doug Cantor, PopSci; ewilhelm; fungus amungus; Graham Hill, TreeHugger; John Mahoney, PopSci; Ken Rother, TreeHugger; Mike Haney, PopSci; noahw; numberandom; reno_dakota; seedlingproject; Shayne McQuaid, TreeHugger; stasterisk; T3h_Muffinator; TetranitrateFor more information on how we judged, click here for the full results.

Posted by canida 10 years ago


Deriving the maximum range and angle of a projectile

In a thread in the Green group, AnarchistAsian and I were discussing his coil guns. I posed the question of what range he could get, and he asked me to go through the physics derivation. Here it is, simplified to require just algebra and trig.The kinetic energy of the projectile E = ½mv2, gives v = sqrt(2E/m) as the speed at launch. Let θ be the angle at which you launch (θ=0° is horizontal, θ=90° is straight up). Then you can decompose the speed into two components: vh = v cos(θ) is the horizontal speed,vv = v sin(θ) is the vertical speed.Gravity only pulls vertically, so the projectile's vertical speed will be slowed down until it reaches its maximum altitude, then it will fall back until it hits the ground. The horizontal speed will remain constant until it hits the ground and stops. To figure out the range, you need to know the time t that the projectile flies before it hits the ground; then the range is just R = vhtEnergy conservation guarantees that it's downward speed at the end is equal to its original upward speed, just with a change of sign. That also means that the total flight time of the projectile will be half going up and half going down. Once you determine how long it takes to reach the top of its flight, you're done; just double that answer :-)In the vertical direction, the maximum heightH = vvt - ½gt2(you need calculus to derive this result). From energy conservation, the initial kinetic energy in the vertical direction, Ev = ½mvv2 must equal the potential energy at the top of the flight, Pv = mgH:mgH = ½mvv2H = ½vv2/gSubstitute this on the left hand side of the trajectory expression,½vv2/g = vvt - ½gt2vv2 = 2gvvt - g2t2vv2 - 2gvvt + g2t2 = 0(vv - gt)2 = 0vv = gtSo, t = vv/g = v sin(θ)/g is the time to reach maximum height. Double that as discussed above, and you get the range R = 2 sin(θ) cos(θ) v/g.Work out the angle that gets you maximum range by just plugging in different angle values and finding the one that is biggest.

Posted by kelseymh 9 years ago


Solar powered cell phone charger case hack

After finding solar chargers and DYI solar videos I had an idea... I'm getting an HTC Evo soon. This phone has a lot of screen real estate. It's going to require a decent sized hip case. Why can't I slap a couple solar panels on the outside of the case with a small USB cable plugged into the phone while it's resting on my belt? I want to take advantage of the size of this thing and have my own hacked solar case. So here's my idea. I want to grab a couple panels out of some all-weather garden lights. Mount two solar panels to the outside of a good case when I find the right one. Then add a 5V regulator wired to a mini-USB plug. When I put my phone in it's pouch I could just plug the end of the short wire into the phone to charge it, or at least help it keep a charge while I'm out and about without having to worry about carrying around a solar kit to pull out and pay attention to. The reason I need advice. I don't know much of anything about solar panels other than what I've heard in other DYI tutorials. I'm not an electrician so I don't know much about the power requirements of the phone outside of standard USB voltage. What would I need for amperage requirements? Is a 5V regulator enough to ensure no damage to the phone? The phone will only pull as much amperage as it needs as far as I understand it. Will the phone safely stop charging when it's full or will I blow up my battery? I know they make cases for iPhones like this for $80+. I think I can build one for ~$20 save for the actual case itself. Any help would be appreciated. Thanks *EDIT: A little bit of clarification on my project. I've looked at a lot of other Instructable projects as well as ones all over Google. I've got a lot of good info from them, and I know I *can* do this, but because I'm trying to charge such an expensive device I want to make sure I have every little detail worked out. I've read warnings about issues with part of a solar cell being in the shade (wasn't detailed on why). With my scope of electrical understanding, I would feel comfortable following these guides if I was doing the exact same project with the same amount of panels, but I'm going to have to change things up a little bit mainly due to space and weight constraints since this is going to be mounted on my hip. The biggest requirement here is that the panels produce enough power to charge a USB device without having to trickle charge a separate battery first. I won't have the space on my cell phone pouch for an extra mounted battery. The entirety of this device should be no more than the pouch itself, one or two solar panels and a few wires. The main concern here is getting the amperage I need to charge the phone faster than it drains with only one or two panels.  I'm not looking for step by step instruction here, just a bit of advice from someone who knows a thing or two about PV to give me some tips on solar panel size and power. Also any safety precautions I need to take to keep from causing electrical damage to my phone.

Posted by HittingSmoke 8 years ago


You can help save a rare frog from extinction!

First off, I realize instructables does not want pure advertising on their site through these forms. The voting is optional and I don't want this to be viewed as advertisement. If nothing else, I want to share with you our story in the project, and hopefully you'll see how awesome this is. We are doing something that no high school has ever achieved before, and I think it's more relevant to the site than some re-posting of a blog article. I hope that you take a few minutes and find out what the Frog Project is all about! Want to support the cause of helping endangered species, education, and advancing biotech in schools? Well, take 5 minutes and vote for our school to convince Khols' to give us 1/2 million $$! Unfortunately the contest is over, but we're going to go for a $250,000 grant for a Pepsi contest in November. If you become a fan of our page (noted below) you'll be updated. Check back in November! https://www.facebook.com/pages/The-AAEC-Frog-Project/128763967175416 ======================================================== Not convinced? Well, here's our story: You can help save a rare frog from extinction, and it is free! Kohls the dept. store is donating $500,000 to the 20 schools with the most creative need for the money. Your vote can help our school win this money, and best of all it costs you nothing! We are working on a project to try and save a rare frog from extinction. And we need the cash. At our small high school of 300 students, we are trying to completely sequence the genome of a rare Arizona frog. We hope to accomplish 2 things from this work. 1) We hope to rescue this frog from extinction. 2) We hope to train a new generation of students in modern biotechnology, and rescue the State of Arizona from last place in quality of education in the United States. The Chiricahua Leopard frog is currently listed as a threatened species. We have been working in conjunction with the Phoenix Zoo and Arizona Game and Fish to develop a genetic test that could aid in conservation efforts. We have already spent a year working on the sequence of the mitochondrial chromosome of this frog. Our school actually owns a DNA sequencer. We have made pioneering efforts in the design of genetic tests for this frog. Our students have presented 5 posters on our work at the International Plant and Animal Genome conference (PAG), quite an achievement for a high school. Our project was recently awarded one of only three heritage grants: http://www.gf.state.az.us/w_c/heritage_projects.shtml By the way, the other two Heritage grants were awarded to Arizona State University and Northern Arizona University. What we really wish to do is completely sequence every chromosome in this frog. This is a very ambitious project. Consider that the human genome project completed in 2003, cost $3 billion dollars and took 13 years. Our leopard frog is estimated to contain twice as much DNA as humans! However, we think that with appropriate funding, and new technology that has recently become available we can accomplish this task in 2 years! We wish to construct what are called “DNA libraries”, collections of broken chromosome fragments of known sizes. These can be sequenced quickly using NEXT generation sequencing technology. The Chinese genomic group BGI has agreed to cover the costs of NEXT generation sequencing, and genome assembly for our project (an estimated $1 million) if our school can come up with the remaining funds needed for the construction of the libraries. We need to purchase about $200,000 in new equipment, and extend our existing lab space. With the completed genome sequence, we would like to have a custom “gene chip” manufactured. This chip will have all the DNA of the frog physically printed on it. The chip allows experiments to be carried out without any harm to any frog. This chip could then be used to aid conservation efforts by the Phoenix Zoo and Arizona Game & Fish. It could allow the exact parentage of every Chiricahua frog that is discovered to be known. Eventually this technology will become the backbone of conservation work on all species, but at this early stage it is not possible for Arizona Game & Fish to raise the funds needed to generate a gene chip before it is too late for the frog. Our school hopes to be the first in history to carry out a genome project. We hope this will serve as a guiding light to other schools, and start a grass-roots movement in the conservation and education world. Help us save our frog! Here is the catch. Vote for us on Facebook, and convince all your friends to do the same (forward this message to them), or unfortunately the frog bites it! Everybody can vote up to 5 times for us. In this way YOU can help make the difference not only for this rare species, but if we can succeed you will help pave the way to help many others. https://apps.facebook.com/KohlsCares/school/32741/aaec-paradise-valley Regards, -Mike Dr. Mike Brown Science Dept. Chair AAEC-Paradise Valley Phoenix Arizona 602 569 1101 Interesting references/links about our project and research (really, we are real!): Abstracts to posters presented by our high school students at the Plant ANimal Genome Conference (PAG)http://www.intl-pag.org/17/abstracts/P03a_PAGXVII_102.html http://www.intl-pag.org/pag/17/abstracts/P03b_PAGXVII_134.html http://www.intl-pag.org/18/abstracts/P03d_PAGXVIII_162.html http://www.intl-pag.org/18/abstracts/P01_PAGXVIII_031.html http://www.intl-pag.org/18/abstracts/P03b_PAGXVIII_155.html Our high school and its project http://www.aaechighschools.com/teachers/pv/mbrown/abstract.htm The MoBio scientific supply company featured us in their 2009 catalog, and describes our project on their “where in the world” page of their website: http://www.mobio.com/pages/wiw-namerica.html See page 8 of the Phoenix Zoo’s Conservation Science Newsletter: http://www.phoenixzoo.org/learn/Conservation_and_Science_Newsletter_Winter_09.pdf A recent article from the press: http://www.somonews.com/article.cfm?articleID=18154

Posted by lukethebook333 7 years ago