Changing DC voltage and amperage?

I've been looking into HHO units and the most efficient voltage is 1.5 VDC but the units pull 30 Amps.  All the converters and modules seem wasteful while I feel there is a direct way to create this supply with minimal loss from battery supply.  Resistors seem to be the most efficient but what resistor can turn 12V into 1.5V while delivering 30 Amps without burning something out.  I'm contemplating a bank of resistors all on separate leads and tied together in a parallel combination so the 30 Amps are split along many lower amp rated resistors.  I just don't know enough about DC conversion to know if amps will become volts or just get lost to heat dissipation.  An HHO unit relies on the highest efficiency current supply to perform correctly and save my gas.  The units are out there but not this fine tuned system I want to build because 1.5V at a 30 A draw from a 12V car battery is hard to do without wasting the gas in just converting the ideal power supply.  I've heard talk of using diodes as well.  Is a diode or resistor setup more efficient than a PWM?  Could I combine diodes and resistors for better efficiency?  I've been searching the web for info but it just confused me more as nothing I've read comes anywhere close to what I'm trying to do.  Those I've read about that try to build the most efficient power supply end up burning up their components by pushing them too hard while instructing others to do the same.  There has to be an efficient way to create that ideal supply current without much loss.  Could it be run straight off my alternator since it produces AC before the voltage regulator converts it to DC or would a second regulator just waste more current than resistors and diodes from the 12V battery?  Any advice or info would be greatly appreciated.    

Question by bmac30   |  last reply


Higher efficiency (high amp) 12V regulator alternative to 7812

I need a high efficiency 12V DC regulator to supply my thermoelectric modules (they're very inexpensive so I had no choice but to use them). I found that the modules are most efficient at 12V @ ~7A each. I could use many 7812s in parallel but they are too inefficient and too much energy is lost to heat. Is there any alternative? Electricity bills are going up so it'd be very good if I can find an extremely efficient step-down or step-up regulator, short of using an expensive 'gold standard' ATX PSU (which are usually upwards of 500W so the power savings don't matter).

Topic by arikyeo   |  last reply


What components do I need to produce my 3 rechargeable Power-Packs using what ive collected so far ? Please can anyone help ?

Hello & Good day to you all, I'm making my own powerpacks for: a miniature wireless CCTV camera & receiver (Link Below for specs) , and a rechargeable powerpack to charge my laptop (that dies in 15minutes!) Wireless Pinhole Spy Camera & receiver After spending stupid money on sh*t 9 volt batteries (600mAh = £11 EACH) - ive had enough of the crap and absolutely absurdly LOW capacity 9 volt batteries out there (when TODAY's 'D' cell is capable of 11,000mAh !!!) and extremely high cost - i am making a battery-pack to power my receiver and another power-pack for the wireless camera using Ni-MH rechargeable batteries in the following packs: Powerpack 1 (for camera) 6 x 18650 cells @ 3.6v each, 5000mAh {Total Power=21.6v} Output Power Needed:  8v, 200mA Powerpack 2 (for camera receiver) 24 x D Size cells @ 1.2v each 11000mAh ( Total Power= 28.8v)  Output Power Needed: 12v, 500mA  Powerpack 3 (for Laptop) 40 x D cells @ 1.2v each, 11000mAh {Total Power=48v} Output Power Needed: 16v, 4A  I should add that my existing 9-volt (2 new & 1 old) rechargeable batteries are a little-more-than USELESS (Rated @ 175mAh...{USELESS}) as the receiver of my wireless camera drinks the power (juice, lol) at an extremely FAST-Rate... 15 minutes of use and its DEAD. 10 mins of use from the old 9 volt battery. And thats all from a 9 hour charge... How pitiful...Despicable & Disgusting... Now i got the idea to use a semiconductor from an instructable to make a simple solder-fume-extractor... (Link Below!) and also i know that resistors can reduce the voltage and amperage output of a circuit.......... Solder Fume Extractor I have calculated, researched, 'Googled', calculated again, more googling and after 6 months of trawling through the internet to find parts of designs i could hack together to achieve my goals including getting answers from "SO-CALLED-EXPERTS 'In the trade'" and from Circuitry & Electronics Forums (whom shall not be named...) yet they always say, yeah, here's my email address, email me your questions and when i do, they all turn around and gimmi some crap like "oh...well...you have your plan all set-out so what do you need me for ?" AS*HOLES! F*C*ING AS*HOLES!!! - If these peeps didnt want to help in the 1st place, then WHY BOTHER to give me their email address so i could ask them directly for help ? Im now going to give up and finally cry-out --- Please HELP (Again and probably for the last time!) ok ok, enough of the hell's-anger-fuelled-rage-at-"EXPERTS" who give me the run-around.....(Bcoz they're AS*HOLES...) Please please please can anyone help me find the components i need to make my very simple circuits for my battery packs ! I know that the use of a/a few? semiconductor/s (3 pin only) can let in a certain voltage and only output a specific voltage & amperage - i think i'll be needing a combination of a semiconductor and a resistor but i've searched continuous for 6 months now and am now irritated-beyond-belief that i still haven't found what im looking for or that no one is willing to help! ffs! Many thanks in advance for some light on this darn-troubling matter.... Please Help !!! Power-Specification For My Gear: Wireless Receiver: DC 12V 500mA Wireless Camera: DC 8V 200mA Sony Vaio Laptop 16v, 4A Also how do i charge my individual power-packs ? At what volts & amps do i charge them ??? Im already severely mobility-impaired and wouldn't want my life getting worse by any of my battery-packs exploding near me!!!!  Ingredients i have collected So Far: - 12 x 18650 5000mAh Batteries (Li-ion) (i want to make a total of two power-packs with these) - Solder Tabs for battery Packs -Small to medium collection of semiconductors + (plus) & - (minus) output voltages (from -24v to +25v) and from 100mA to 1.5mA amperage... - Heatshrink (40mm, 50mm, 70mm) - 24 x D cells @ 11000mAh - 40 x D cells @ 11000mAh I have no resistors but can order anything i need online if i only knew what to order!!! i would also need to include a circuit to prevent deep-discharge & over-charge! This is where i need the main help: I cannot read electrical diagrams at all but try to but it takes a day of deciphering and thats only if i do it right, i have dyslexia and am fighting daily with it when it comes to referring to any diagrams concerning circuits so would it be possible if someone could draw the circuits i need onto an a4 piece of paper and photograph it to be posted here (or draw it in paint, lol) - what i mean is, to draw a basic 3 pin semiconductor (a square with the 3 pins coming out the bottom, lol) and then draw the wires that need to connect to all the 3 pins to then for the wires to go to whatever component they need to go to next, for example ? {the 'solder-fume-extractor's' wiring picture where you can clearly-see where all the wires connect to all the components is the only type of simple diagram i can read by myself} Still wiht me ? i lose myself sometimes! So as i understand it, from what ive been reading so far, as long as the voltage output of the battery pack is correct, say for example for my wireless camera, if ive used a semiconductor to get the voltage of my power-pack down to give an output of 8v rated to 500mAh, as the device (wireless camera) only uses a max of 200mAh, then does this mean that the device will only use what it needs and ignore the rest ? Also it has taken a week of help from many friends of mine to help write this question and to keep it on-track with my main goals for the 3 power-packs listed above! if anyone needs more info, please let me know and i shall endeavor to reply as soon as humanly possible, again many thanks for your help Again, many thanks in advance for all help given and i sincerely apologize the long speech of a few questions, im afraid i get too-specific when asking for help (and often branch-off far-too-much, like now, lol)

Topic by offtherails2010 


How to make indoor lightning with Led Strip + Battery + Solar Panel?

Hello everyone, First thing first. As you know im new to this =) However, im familiar with wiring & soldering some easy parts. I will try describe my problem detailed as possible for future readers with same problem. My Grandmother living on a top of mountain for like 5 months in a year. As you gues, there is no electric. So, i decided to give her indoor lightning with solar enegry and led strip for at least 2-3h in a day. Place where she lives is mostly sunny. I can say thats about full sunny 3 months of 5 and semi-sunny or cloudy 2 months of 5 in total (There will be no autumn or winter usage). I'm not planning to use 5m of strip at one connection. There are 4 rooms in the house. I'm thinking 9 leds (or 12) in each rooms. Lets say 12 for fixed amount talk. That makes 12 x 4 = 48 leds in total. If light would not enough for her, can consider increase led numbers 24 in each rooms. Also dose not excepting light from leds as normal lightning. Just wanting she would be able to see whats around. My plan was simple before starting seacrh (LOL). 1 or 2 entry level solar panel(s). A backup battery (Li-Ion) charged via solar panel. And leds. So, things were not gone as expected of course. I had searched like 5-6 hours about this in past 3 days. I had read every similar situations (or a part of this) that i find on here or somewhere else (other forums). Situations was different all the time. But, i learned a lot. And this is not enough yet. I have learned there are a few types of 12V strip led (Do not remembering the link, sorry). But those are; 2835, 3014, 3528, 5050 and 5730. If i did not get it wrong, when number goes down brightnes goes down too. But, energy consumption goes down too. There are a few things about led strips to know: There is a Power Consumption number for all leds. But, that is not means all 5050 leds will consume same amount or other numbers. And its important about feeding your led strip. It depends on brand or manufacturer. If i didnt get it wrong (again). If you feed your led more than its required Voltage, it means you are grinding its life cycle. It will gonna die faster than normal life time. That is also causing overheat on leds strips. However, not sure if its life time will be longer than normal if you feed it with less Voltage. Forexample; feed 12V led strip with 11V. Did not see anything about it while searching. And last thing that i have learned about leds while searching is, led strips can be different on led numbers on them. Mostly (that i had read) they are 2 types on number. One is 60 leds on 1 meter and other on is 30 leds on 1 meter. I have learned realy a lot about Li-Ion batteries at this link https://www.e-cigarette-forum.com/forum/blog-entry/9-battery-basics-for-mods-the-ultimate-battery-guide.4848/ I have learned "do not over voltage your leds" and alternative methods in theory at this link http://electronics.stackexchange.com/questions/135611/what-happens-if-i-supply-18v-to-a-12v-lighted-switch I have learned "sometimes exact V is not enough when using solar panel" at this link (still confused about DC Booster part about will i need it or not) https://www.instructables.com/answers/Why-can-I-recharge-lead-acid-batteries-with-solar-/ I have semi-learned "how to calculate Watts, Amps etc" at this link http://diy.stackexchange.com/questions/18225/what-do-i-need-to-install-led-strip-lighting I have learned there is a "Ohm's Law" and calculate/use it at this link http://electronics.stackexchange.com/questions/117594/how-to-get-12v-5amps-battery-setup-for-led-strip I have consolidated my new infos at this link https://sirs-e.com/general/battery-powered-led-strips/ I have learned, that i can improve my batteries capacity or voltage (or both same time) with series/parallel connecting them at this link https://www.batterystuff.com/kb/articles/battery-articles/battery-bank-tutorial.html And few more links via links at above including i have learned there is a battery type 12V named "Lead Acid Battery" and variations of it. I chose parts at below aka my simple plan (LOL). Batteries (not all of them, need to decide which one. Batteries chosen via Li-Ion battery explanation link at above): 26650 5200mAh 3.7V High Capacity High Drain IMR Li-ion Orbtronic Battery -  http://www.orbtronic.com/26650-5200mAh-IMR-Li-ion-battery-orbtronic Panasonic NCR18650PF 18650 10 Amp. 2900mAh Hybrid IMR Li-ion Rechargeable Battery - Flat Top - High Drain -   http://www.orbtronic.com/batteries-chargers/high-drain-18650-2900mah-ncr18650pd-hybrid-li-ion-rechargeable-battery-panasonic-flat-top Solar Panels: 220x200mm-12V-5W-Solar-Panel-Fit-Car-Battery-Trickle-Charger-Backpack-Power http://www.ebay.com/itm/220x200mm-12V-5W-Solar-Panel-Fit-Car-Battery-Trickle-Charger-Backpack-Power/141777113443?_trksid=p2047675.c100009.m1982&_trkparms=aid%3D777000%26algo%3DABA.MBE%26ao%3D1%26asc%3D36144%26meid%3Da11bbdc4faa8438bb298191c9d100913%26pid%3D100009%26rk%3D1%26rkt%3D1%26mehot%3Dag%26sd%3D221887501129 10W 12V Polycrystalline Cells Solar Panel Poly Battery Charger Power Generator http://www.ebay.com/itm/10W-12V-Polycrystalline-Cells-Solar-Panel-Poly-Battery-Charger-Power-Generator-/221887501129?hash=item33a9869349:g:za4AAOSwVL1V-TGi Now, i need your help and advices. Because, after all reads, King-Kong is still jumping in my head. As i described before; i want to use a (or two) solar panel(s) and charge batteries then use batteries for light small led strips. All led strips should be connected together on one circuit from batteries. Ofcourse there will be small switchs in each room to lit on/off led strips. 4 x 3.7V Batteries makes a total of 14.8V or 3 x 3.7V batteries with 11.1V will do the job too? Can i connect 3 batteries in series and parallel for improve capacity and voltaj? If possible, prefer to use batteries in day time too. Not for long day time or load. I gues like 5-10 mins in day time for dark rooms. Detailed explanation or step by step guide link would be freaky awsome. I have learned many things while searching but in theory. As you know im all about strange to terms. And there will be few future readers like me too i believe. I'm sorry about my English and long links. Do not know how to shorten them. Best regards, Mehmet

Question by signOnthe   |  last reply