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,

Posted by RaghuC 3 years ago  |  last reply 3 years ago

Charged twice

I just joined today and my bank notified me that I was charged twice for this membership. Please explain and correct. MilDoc

Posted by MilDoc 8 years ago

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

Posted by puddlepod 6 years ago  |  last reply 6 years ago

Battery Charging? Answered

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

Asked by KnexFreak360 7 years ago  |  last reply 7 years ago

chargeing bateries

Does anybody know how to charge a nihm battery extremely fast?

Posted by In The House Of Ill Repute 12 years ago  |  last reply 12 years ago

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

Posted by Fozzibehr 5 years ago  |  last reply 5 years ago

battery charging?

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

Asked by johnnywgk 9 years ago

Phone not charging!

I have a nokia 6061, just got it a week ago and when i went to charge it today nothing happened. The outlet is turned on and the phone works fine it just won't charge! Any ideas on why this is happening!

Posted by sardines454 11 years ago  |  last reply 11 years ago

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

Asked by IndianHacker002 3 years ago  |  last reply 3 years ago

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 ?

Asked by omar kotrash 2 years ago  |  last reply 2 years ago

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?

Asked by ben2000 3 years ago  |  last reply 3 years ago

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?

Posted by ben2000 3 years ago  |  last reply 3 years ago

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?

Posted by guyfrom7up 8 years ago  |  last reply 7 years ago

How to charge this capacitor? Answered

I got this from a lightbulb. (three way)

Asked by Xixfas 5 years ago  |  last reply 5 years ago

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

Posted by romeob 3 years ago  |  last reply 3 years ago

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

Asked by squirt8500 9 years ago  |  last reply 7 years ago

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.

Asked by Electric Spectre1 2 years ago  |  last reply 2 years ago

Double charge for membership

I was charged twice on the same day when I signed up for my membership!  How can I get this corrected?

Posted by xenagirl 6 years ago  |  last reply 6 years ago

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.

Asked by Hammock Boy 5 years ago  |  last reply 5 years ago

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?

Posted by merlinj 3 years ago  |  last reply 3 years ago

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.

Posted by o0SLOVAKIA0o 5 years ago  |  last reply 5 years ago

how to charge kapacitator

I don't know how (actually I don't know what to use) to charge capacitator .Someone help me? I know i need at least 5kV power supply but where to find it?

Posted by Dantex 11 years ago  |  last reply 6 years ago

Help with charging capacitors

How do I charge my 450v capacitors with a 120v outlet? I am building a rail gun and need to get these up to a high enough voltage. 

Posted by gclark0812 1 year ago  |  last reply 1 year ago

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------------------  ??  ------------|                       

Asked by infinity1 2 years ago  |  last reply 2 years ago

Charged for Year Membership

I was charged for a full year of pro membership when I only signed up for a month of pro. I did not even select the year. So I want to know what I can do to get a refund for the year when all I wanted was a month.

Posted by Mythotical 5 years ago  |  last reply 5 years ago

Laptop Battery Charging

I salvaged a battery pack from an old laptop and i was wondering if i could charge the cells in the pack using the laptop charger that came with it. can i connect the power connector rom the charger straight to the control board inside the pack or do i have to get a different charger to charge each individual cell? bottom left of the picture is where i think the power goes in and out (red and black wire).

Posted by KT Gadget 10 years ago  |  last reply 10 years ago

solar charged bateries?

Anyone thing this kind of thing can be done?,250000598,49301285,00.htmim not sure if flexible solar panels are avaliable

Asked by minus273degrees 9 years ago  |  last reply 9 years ago

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!

Posted by guyfrom7up 9 years ago  |  last reply 9 years ago

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

Asked by snotty 7 years ago  |  last reply 2 years ago

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

Posted by Gvozdenovic 7 years ago  |  last reply 7 years ago

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!

Posted by JesusG33k 3 years ago  |  last reply 3 years ago

how can i store charge?

Asked by arunluke 5 years ago  |  last reply 5 years ago

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!

Asked by nepheron 8 years ago  |  last reply 8 years ago

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.

Asked by ZdEEvO 9 years ago  |  last reply 9 years ago

How to charge up a capacitor? Answered

Hi, i am new ,  i want to know How to charge up a capacitor?  i have a 10v capacitor when i link it to 1.5v or 9v its only charge 1.5 or 9v and no more how i can charge it full ? thank you

Asked by BoudjelidaA 3 years ago  |  last reply 3 years ago

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!

Asked by Nothing2it 6 years ago  |  last reply 6 years ago

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!!?

Asked by AJ81 9 years ago  |  last reply 9 years ago

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?

Asked by thomasskelly8 4 years ago  |  last reply 4 years ago

how do i make the best mobile charger ?

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

Asked by imakethings 10 years ago  |  last reply 7 years ago

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!!!

Asked by nepheron 8 years ago  |  last reply 8 years ago

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

Asked by papa1 9 years ago  |  last reply 9 years ago

How fast do capacitors discharge?

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

Asked by mulan2015 7 years ago  |  last reply 7 years ago

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?

Posted by sebarr 9 years ago  |  last reply 9 years ago

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.

Asked by 6 years ago  |  last reply 6 years ago

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?

Asked by willywombat 6 years ago  |  last reply 6 years ago

Solar charge circuit question

Hi, I have a 12 volt / 0.5 watt solar cell and I am hoping to charge a 9 volt / 200 mAh rechargeable battery with it. I think I have a suitable diagram for the circuit here... I was wondering if using a 12 volt cell was ok for charging the 9 volt battery? Would I need to add resistance to the solar cell to bring it down to 9 volts? If so where would I add the resister to that diagram? If it's relevant, the load will be a fan. Thanks.

Posted by horsebones 7 years ago  |  last reply 7 years ago

charging 10s5p battery pack

I'm working on an ebike conversion. I'm buying laptop batteries to take out the 18650s and put them in my pack. I'm looking at a 10s 37v pcm. If I make it in 10 sets of 6 to get 37v 14.4ah, then how can I safely charge the battery so that they don't charge unevenly in each set?

Posted by leaf26 4 years ago  |  last reply 4 years ago

How to positively charge something? Answered

I was sitting here in the middle of a thunder storm and I had a thought, usually the clouds are negatively charged during a lightning strike, so, if you used a large cannon to blast a positive iron ball into the air, you may be able to get lightning to strike it, then collect it to see what the lightning did. So, you would you charge a cannon ball? 

Asked by 6 years ago  |  last reply 6 years ago

how not to over charge a battery?

I want to connect my waterwheel to a car battery, but I dont want it to get overcharged and blow up! what can I do?

Asked by tim13211 9 years ago  |  last reply 6 years ago

charge a battery while using it?

Https:// hi, i'm looking for a way to charge a 12v deep cycle lead acid battery while powering an amplifier from the battery. Can i literally just attach the battery charger to the battery as well as the amplifier as long as the connections to the amplifier and charger do not touch? or is it not that simple?  The instructable linked above is what i what to implement it into. Any help will be appreciated! 

Asked by WillERoberts 5 years ago  |  last reply 5 weeks ago