charging

Hello sir,  Im intrested in solenoids feild and wanna have practical experince in that.can you please tell me how to generate electrical charge by using solenoids and storing that charge in mica capacitors with less voltage rating high storage capability..which also has slow discharge. The time of storing the charge should be high.Hope will guide me. Thankyou. Raghudeep,

Topic by RaghuC   |  last reply


charge controller

I have the cm3024z charge controller. i have 240 watts going in, controller going to batteries, no conection on the load,   have 1500 watt converter hooked to batteries. set the controller as such,,, HvD-14v, LvR-12.5 v'  LvD-10.8 v . my voltage comming in to the controller is good, when i get to the hvd it kicks out at 14v as it should, but my lvr doesnt want to kick back in. i have let the batteties drain below the lvr but will not kick back in ..  is there anybody that can help with this, i have retured the first one and this is my second one with same problem. i have left the system hooked up as acording to manual,but after it kicks out it just wont kick bavk in unless i disconnect the panels and reconnect them.   all help would be appreciate, thanks

Topic by puddlepod   |  last reply


Charging a capacitor? Answered

Recently I've had an idea for a project that requires a relatively low voltage (5 to 30 volts) capacitor bank. However, that capacitor bank needs to be charged. While I do know you can easily just hook it up to power, I find that too simple, and lacking of safety, and knowing when it is fully charged. So, could anyone please enlighten me on how i can charge my cap. bank relatively slowly, with, say, an LED that lights up when charged (to avoid them blowing up in my face), and a kill switch/button that discharges the capacitor bank in the event of an overcharge. If anyone could provide an explanation or circuit diagram that would be great, thanks. BTW, the capacitors I was planning on using are http://www.goldmine-elec-products.com/prodinfo.asp?number=G17623 or http://www.goldmine-elec-products.com/prodinfo.asp?number=G16573.

Question by LiquidLightning   |  last reply


Battery Charging? Answered

If i charge a battery when it's half full will ruin the battery life between charges?

Question by KnexFreak360   |  last reply


Charging Circuit

I was wondering if anyone had any ideas on how to make a circuit so that I could charge a battery, but that I can also power an amplifier when the battery is not charging. Currently I have a switch that switches between a charging circuit and powering the amplifier, but I was looking for a way to do this without having a switch that I have to control

Topic by Fozzibehr   |  last reply


battery charging?

How can i charge my battery, i've lost my charger. the battery is 14.4V 1.5Ah Li-ion

Question by johnnywgk 


Solar charging

Hi, pls suggest me for the following A 20Watt ( 20V , 1000 ma) solar panel is connected to charge a 12V, 80AH battery . What is the value and wattage of a Current limiting resistor to be added?

Topic by khhrao   |  last reply


Capacitor Charging?

How do I charge a capacitor rated for 450v at 1150uf using 2 AAA batteries? I tried using a mini transformer but it takes a very long time. Is there a quicker solution? Thanks in advance, IndianHacker

Question by IndianHacker002   |  last reply


charge battery

I have battery 1cell NI-MH AA 1.2 v 1500mAH   and i need to charge it by using smps and diode for detect peak voltage of battery   i prefer fast charge for maximum 2 hours for my project  how much voltage and current i need in output of smps ?

Question by omar kotrash    |  last reply


Battery Charging?

Hello, So I have a 9.6 volt  NI-CD 4 hour quick charger and the battery(600mah) that goes with it, but I was wondering if I could charge a 7.2 volt 2000mah, Ni-Mh battery with it. If i can for how long?

Topic by ben2000   |  last reply


Battery Charging? Answered

Hello, So I have a 9.6 volt  NI-CD 4 hour quick charger and the battery(600mah) that goes with it, but I was wondering if I could charge a 7.2 volt 2000mah, Ni-Mh battery with it. If i can for how long?

Question by ben2000   |  last reply


batery charging

Having had to buy a dedicated charger for some 18650 cells (at my wife's insistence) I took an interest in these cells for the first time and their smaller cousins the 123a. At with maximum capacities I've come across so far of 3700mAh and 2000mAh respectivley that's twice the capacity of the battery in my smart phone and 2.5 times the capacity of the one in my basic bar phone. The smart phone width would accommodate 3 of the 18650 cells (6 days without charging at my rate of use) and the bar phone possibly 4 of the 123a's (70 hours talk time or 10 months on standby). Yes this would mean a custom made back, but there is at least one instructable on molding a GRP/ carbon phone back adjusting it to take extra cells and maybe ports just needs modeling clay. I suppose I could just carry a power bank, but why if the phone can be its own power bank? Removing the guts of a power bank and building a new phone back to accommodate them may be the simplest answer to this but, my questions are:- A) I've got old mobiles laying around could I use their charging circuits to charge these standard Li-ion cells? Assuming that is a yes that would mean a long charge every 6 days/ 10 months. I gather there are problems associated with parallel charging/ discharging of Li-ion cells and over discharging so, B) Any advice on doing this other than don't? On the assumption that's a don't or even if its not this strikes me as a safer possibility. C) Could a micro controller be configured to discharge one cell to its limit then switch to the next full cell. D) Could a micro controller be configured to charge one cell to capacity then look for the next under capacity cell and charge that. E) if so could it do both at the same time? If A is possible and the rest not then a multi position switch is  probably the answer.

Topic by Stan1y   |  last reply


Induction Charging ? Answered

OK, I have disassembled a old electric tooth brush and I am trying to reduce the size and one of the things I have deemed unnecessary is the PCB that runs the timer built into the toothbrush. However, one thing I am wary of at this moment is that the toothbrush is a induction Charger which is a A/C and I don't know if I can just remove the board and be OK or do I need to rectify the current into D/C to continue charging the battery. If the latter is the case what do I need to achieve this?

Question by Jayccob   |  last reply


Wireless charging? Answered

So i would like to make a simple wireless charger for an ipod (ok ok its not so simple once you factor in the ipod) but i want it to be able to show a charging sign.... also it would be nice if it waould work from one or two feet apart minimum. I heard guys at MIT made one for a 60 watt lamp that worked 2 meters away... so its possible... i can probably order any circuitry if it is reasonably priced and available at digikey or mouser. :) I have access to several ipods so it doesnt really matter what model i use. I also know that this would probably make a huge electromagnetic wave... possibly? idk... but if it is big enough to destroy nearby electronics i might not want to try... So i am all for distance- the farther the better.... Also base power is not an issue, i can use a wall wart if i need to...i can just see an ipod touch with 500 passes of wire around it 5 feet away from a 2 foot square power station..... all while erasing my hard drive :) Soo.... im coming back to reality for a min.... anybody know any sites....any formulas too!! Thx! :) :)

Question by astroboy907   |  last reply


Charging BoostCaps

I recently got a few of the 3000 farad 2.7 boost caps from electronic goldmine.  I have a quick question about charging them.  Applying a higher than rated voltage before the capacitor is charged all the way would be fine, right?  The voltage drop should cause the source voltage to approach 0, thusly below the 2.7 volt rating.  As an extreme example, lets say you simply hooked up a 9 volt battery to it.  Since the battery can only supply like 200mA, the voltage drops to nearly 0 as the capacitor appears to be a dead short.  The dielectric (or ion exchange or napheon membrane or whatever it is in a ultracap, lol) should be fine, correct? My main goal is to later hook up one or two of these for a regenerative brake system of something like a small gokart or bike or something.  Stopping at 30mph is like (assuming 200kg total mass) 20k joules, and each one can hold about 10k joules, and assuming a max efficiency of like 30 or 40% (I think itd be much lower, though), these capacitors could brake a gokart going fairly several times without having to be discharged inbetween cycled (but of course they would be).  For braking, could these essentially be hooked up directly (of course with pwm, and other things, but in essence:) to the motor with a little protection circuitry to prevent overcharging the capacitors?  Or would the higher voltage instantly puncture and destroy the boostcap?

Topic by guyfrom7up   |  last reply


How to charge this capacitor? Answered

I got this from a lightbulb. (three way)

Question by Xixfas   |  last reply


Charge controller CM3024z

Hi,  im a student, i just  wanna ask if i can use the charge controller CM3024Z to a Magneto (alternator) and coupled with a solar panel 50watts? does the solar charge controller are for solar panel only? thanks godbless

Topic by romeob   |  last reply


How to charge a capacitor? Answered

I read some where that you need a rising amount of volts to charge a capacitor, but I also always see around that you can just charge a capacitor on just a straight battery that is DC. I am very confused how you can and should charge a capacitor.I think the formula for charging a capacitor is i=C(dV/dT)Thanks

Question by squirt8500   |  last reply


SLA Battery Charging? Answered

Quick question about charging SLA Batteries, I haven't really dealt with battery charging too much in the past.  I have two 12v 5Ah SLA batteries, in series, and I have built an under/over voltage protection circuit for each of them, but while charging I noticed that testing voltages across each battery, they are different, however, as soon as I remove the charger and test them as is, they have the exact same voltage (+/-0.05 volts, they are very close).  Is this just because the charger is hooked up, or should I be worried at all about that? I am charging them to 14.75 volts each, or would like to, they say they should be charged to 14.5 to 15v right on the front of them.  While charging they both climb, but one climbs faster and stops once the voltmeter reads 15.2v across it.  0.2v over the rated value really doesn't seem to be of major concern, I just find it odd the different voltmeter readings across the batteries are different while the charger is connected and identical when its not.  Does it have something to do with charging them in series?  I did read that you really can't measure batteries while charging, you have to disconnect the charger first, but any insight would be appreciated.

Question by Electric Spectre1   |  last reply


LiPoly charging question?

Hi Everyone, I am creating a 6 cell pack (first time as you can tell) of LiPoly batteries 14.8V 5A it will have 3 groups in series of 2 in parallel for a 44.4V 10A pack. In order to properly charge and maintain the batteries does anyone have any recommendations for a good balance charger from hobbyking or elsewhere? Also in order to properly charge them should I charge each of the 6 cells individually, or charge the 3 packs of 2 in parallel using these?  Thanks for your help.

Question by Hammock Boy   |  last reply


Over-Charging Capacitor

What happens if you connect some form of dc power source that supplies 100 volts to a capacitor that is rated for 100 volts, and leave it plugged in for a long period of time. would it eventually "over charge" and explode? would it over heat? would it loose its  ability to store energy?

Topic by merlinj   |  last reply


led charging circuit

I dont have much experience designing circuits but i can soldier. I need to design a circuit that can charge 2 aa rechargable batteries and power 2 leds. Each rated at 25ma and 2.0~2.2. I want the circuit to be charged by usb and use a 3 way switch. Off, on (both leds) and charge. The usb will be plugged into a mains usb charger, not a pc port. I think i have included all important details. So please help me by explaining what i need to do and possibly schematics.

Topic by o0SLOVAKIA0o   |  last reply


12v battery charging?

I'm making a prop that has 6 12v 6800mAh rechargeable batteries, but i wanted two ways of charging them, a normal plug in to a wall adapter, but also jump lead connectors, so I'm able to charge it of a reving car, or a leisure battery, all my questions are, is what would i need in the circuit to make it safe, and work, imbetween the jump lead charge wires, the normal adapter charger lead, and the batteries them selfs. JUMP LEAD------------  ??  ----------------------------       WIRES                                                          |                                                                             |------------------  ?? -------- BATTERIES ----------12v -------                                                                             |                                                                             POWER ADAPTER------------------  ??  ------------|                       

Question by infinity1   |  last reply


charging batteries with 240V? Answered

I was thinking, wall transformers only transform so much energy(70-90%?) the rest goes off into heat. so, wouldnt it be better to charge 160 AA batteries at the same time in serial (thus making 240V) directly off the wart? i know this is just theory, since its not practical, not managable or anything, but i just wondered if it could be done. would this solve the energy loss from heating the transformator up?

Question by godofal   |  last reply


Waterproof charging input?

Hello everyone, I'm new to electronics and while I can usually find what I need by asking good ole' Google, I decided to try asking a forum of people more knowledgeable on the subject. My question relates to the charger input on devices with internal batteries. I have a Braun razor that can be used in the shower, and I was curious how it can go in water with the two charging prongs exposed? Thanks in advance! 

Topic by alpizzles   |  last reply


Charging Multiple NiMH

I'm modding something (secret, Instructable later) and there's going to be some integrated NiMH batteries to replace the one 1.5 AA battery that the device use to use. Due to funky space constrictions, I'll be using 7 tiny 320mAh 1.2V NiMH coin cells in parallel (to get a decent amount of maH). How hard is it to charge a bunch of batteries like this? Could I get a chip from a place like Maxim or TI? All of their chips require the batteries to be in series... Thankyou!

Topic by guyfrom7up   |  last reply


Charge level indicator?

I need a nice, simple charge indicator. I have a battery pack that holds 4 AA NiMH batteries. Normally they charge up to 1.3V per cell or 4X1.3=5.2V total. I have a solar trickle charger on there too and I'd like to have a little charge indicator.   Requirements are: -low part count -under $10 -small (it's on my bike helmet) I was thinking something with a pushbutton an LED or two and a zener diode. Something that turns on the LED at  greater than 5.2 volts. But I don't have experience with zener diodes. Has anyone seen a system like this around? Can you think one up? -Cheers

Question by snotty   |  last reply


Wirelessly charged mouse

I need some help from all yall out there. My idea is a wirelessly charged mouse. The mouse pad acts as the transmitter coil, and the receiver is in the mouse. The concept might not be phenomenal for gamers, but would be a step into getting rid of wires on our peripherals and really making wireless charging reality. Perhaps a .2 farad super capacitor (.2 Farads ~ 400mAh) could be used to prevent the mouse from dying if you drag if off the pad for a few minutes. I'd need help conceptualizing it and for those of you who know about electronics, assisting me in designing a schematic. The design would be open source so we can have literally anybody contribute and improve the idea. Leave a reply if you want in!

Topic by JesusG33k   |  last reply


USB charge. Will this work?

Will this work? please reply with this LED work for me.....If i put the  USB cable from my phone or mp3 player  instead of the diode...Will this work? P.S.  my english is not very well

Topic by Gvozdenovic   |  last reply


how can i store charge?

Question by arunluke   |  last reply


Please explain WATTS to me! Answered

 I know watts equal amps times volts. But why? What is the benefit? Hypothetically, I wanted charge a laptop with some batteries ( instead of with the charger cord). The charger cord says 65 watts or some such, but what does that tell me?  Is 65 watts the same as 13 volts at 5 amps? Or 13 amps with 5 volts? what voltage/amperage would I need to charge this laptop? Thanks!

Question by nepheron   |  last reply


can i charge this battery with a solar charge controller? Answered

I have recently bought this solar charger kit from amazon.com (http://www.amazon.com/gp/product/B004FOEUI0/ref=oh_details_o00_s00_i00?ie=UTF8&psc;=1) and was curious if i could charge two of these small sla batteries hooked in a parallel to power a project. If it is too much power how would i bring it down to a safe level for the batteries? help would be appreciated thanks: Harry

Question by harry88   |  last reply


Dynamo charging charging circuit for AA NiCd/NiMh? Answered

I've just got hold of a Union 6V 3W dynamo with lights. I'd like to charge 4/5/6 x AA batteries during the day then switch to the batteries for the lights at night. I'm switching out the old bulbs for LEDs. Any pointers or relevant 'ibles would be great. Thanks in advance people.

Question by ZdEEvO   |  last reply


Can some one help me charge my laptop?

I've lost dc part of my laptop (where you plug in the cord) and I've got no way to charge my battery. Please help me!

Question by Nothing2it   |  last reply


Laptop does not charge and audio is also gone. Pls help!!

I have a Dell Inspiron 9200 which is abt 5yrs old. My original DELL charger went bad so i started using the DELL charger for my work laptop. However, whenever i rebooted it gave me a warning message stating your system performance will be slow when using this power adapter. I ignored it and continued using it for a few weeks until i got a blue screen stating "the disk is unmountable". I immediately ordered a new replacement adapter. I also ordered a replacement battery coz i noticed that the battery charge ran out pretty quickly and i always had to have the laptop on AC power all the time. The blue screen went away after replacing the adapter. Few weeks after this, the audio suddenly stopped working and now the laptop just doesnt charge. Is the motherboard gone bad? Should i just buy a new laptop or is it gonna be cheaper repairing the existing one? Pls help!!?

Question by AJ81   |  last reply


I cannot seem to charge my run battery at the same time i am using an inverter .

I am trying an experiment to charge a run battery supplying power to an inverter that is used to  make more DC voltage. I Can charge an alternate battery, but when i connected to the run battery it drains to fast  and the inverter stops working. I have a diode on the positive so no drain there. How Can i allow charge voltage in at the same time as running an inverter?

Question by thomasskelly8   |  last reply


how do i make the best mobile charger ?

There are so many designs available which design is the best and economical to charge?

Question by imakethings   |  last reply


I have a simple question about watts... Answered

Watts = amps times volts, correct? So if I had a laptop that charged with a 60 watt power supply, could I: -Charge it with 10 amps at 6 volts? (that is the same as 60 watts) -Charge it with 6 amps at 10 volts? (that is ALSO the same as 60 watts) -Charge it with 5 amps at 12 volts? (that is ALSO the same as 60 watts) -ect... Watts is just how much 'energy' passes a single point every second (or whatever), so it doesn't matter how you get the watts, watts is still watts? I'm still trying to grasp the whole concept of watts, so yours answers are infinitely appreciated!!!

Question by nepheron   |  last reply


what to do with all the left over chirstmas battery that run all those chirstmas stuff?

Can i some how charge them i dont like to throw them away and buy new one again

Question by papa1   |  last reply


How fast do capacitors discharge?

Do they discharge to 0 volts? pls and thank you (for my school expo project)

Question by mulan2015   |  last reply


i has make solar charger! (so i hope - please take a look)

Hi everyone! i'm not so acquainted with soldering electronics and making solar equipment. but i want to be! so i soldered (so i hope) a solar charger for 2 AA batteries. material: 4 solar cells (~1.5V each) switch diod battery case picture frame please take a look at the pictures - does this construction make sense?

Topic by sebarr   |  last reply


Are capacitor charging circuits necessary? Answered

So I was looking at some coilguns and all of them have a circuit to control the charging, is this really necessary or can you just apply the voltage you want and let them charge.

Question by jj.inc   |  last reply


MP3 Battery won't charge?

I have just bought a generic MP 3/4 and did not fully charge the battery before exploring it's apps. Now I have a half full battery that won't charge any further. Can anyone help?

Question by willywombat   |  last reply


Can a solar light be charged indoors?

Hey guys, Can a solar panel like this be charged with indoor lighting, like a calculator is, or does it need to be actual sunlight? Its rainy and cold in Canada, and need to know if I can just sit it on the kitchen table all day (the light is on anyway) and charge it up. Working on a Sun Jar, and have disassembled the outdoor solar light. I want to know if the panel/battery/light is in working order (I found an opened box at H.D. on sale for 1/2 price!) :) Thanks

Topic by Fast Eddie 


Li-ion battery charging question

I'm new here so hi first. Now to the question I've been making a portable wii lately and I've gone quite far, but I'm stuck at the power. So I've got two 20000mAh mobile batteries (10000mAh 4.2V x2 in parallel for one mobile pack) i was planning to connect the batteries in series to get the required 12v+ power to get the Wii running . Since this is a mobile battery it has a charging circuit for the battery in parallel . I was thinking how to charge the batteries in balance (in series) . It's quite confusing ,any help will be appreciated!( There is very little information of the batteries inside the pack, it only says [10000mAh Max 4.2V])

Question by WanjiangW   |  last reply


How do solar charge controllers work?

I want to get a 5 watt 12 volt solar battery charger but I want to clear up my understanding of how they work before I get one.   FIrst:  The panel comes with a charge controller.  It says it cuts in at 13 volts.  What does that mean?  It starts charging once the battery drops to 13 volts?  That can't be it because 12 volt batteries range in voltage from 11.9 to 12.6 volts (charged/discharged).   Second:  "12 volt panels" output more than 12 volts right?: because batteries need 14.8 volts to charge.   I think they call it a 12 volt volt panel because it charges 12 volt batteries and not because it outputs 12 volts.  It must really output 22 volts and the charge controller steps it down to 14.8 volts. Thanks for the help Jacob 

Question by Noblenutria   |  last reply


Help in buying Solar Charge Controller?

I want to buy this. What is the best battery and solar panel for the same. I want  to use 6V rechargeable lithium batteries. I am guessing 2 in series will be required. Can I use array of Ni-MH pencil batteries with solar chargers? I will be mostly using the setup for emergency power supply in all rooms (5). I may also use night lamps as trickle drain.

Question by artworker   |  last reply


Can dumb / feature phone be charged using USB?

Hello, I recently received a USB power pack but I can't seem to charge the dumb / feature phones that I have.  When I use this adapter to connect the phones they say that they are charging but even after 5 hours they seem like they didn't get a charge t all. Is the voltage difference the issue? With the USB being 5V and the phone battery being 3.7V (though the output of the chargers that the phones came with is 5V). Could I have a faulty unit? Thanks for reading.

Topic by Full Metal   |  last reply


Need to make charge indicator for 4 V 1 Ah Lead Acid battery Answered

Hi,  I have made a solar study lamp. I am using 4 volts 1 Ah lead acid battery for the same and 3 Watt solar panel. It charges well with the current circuit. But it does not have a charge indicator. I am looking for a battery charging circuit with charge indicators as follows: 1. Low battery indicator  2. Battery full indicator 3. Charging indicator - to indicate battery is getting charged Trying to keep this simple and inexpensive as this lamp is a part of social initiative for rural areas. Thanks in advance! 

Question by rahuldj   |  last reply


is there a way to charge a cell phone battery without the cell phone. If so, how?

The reason i ask this question is because my cell phone stopped charging my battery. it's not the charger or the battery...it where u plug the charger into the cell phone that is not making contact.   I know that regular batteries (AAA, AA) can be charged universally as long as the battery is a rechargeable one.  How about a cell phone battery?

Question by johnshericosmo   |  last reply