Second battery pack done!

guido

Well-known Member
Hello,
Both packs charged to 4.1volts. They are pretty close in open voltage. one is 4.02 volts, the other 4.08volts. When I get enough cells for the 3rd pack, I will charge each 4 volts pack to get all three voltages close as possible to each other. Then charge the three as a 12volt pack. Stay tuned....

Guido.
a231428.jpg
 
Hello Buddy,

Cells are free, and takes a few minutes to assemble the pack. Charging then while in the garage doing other work...

GUIDO.
 
Hello Geo-TH,In

With the third pack in series it will be at 12.6 volts for a jump box. I have two capacitors also wire in parallel, which will be also part of the box. I want to be able to hook the fully charged caps just before I hook up the battery pack.

Guido.
 
Gudio, don't see the value in adding caps. Q=CV. Q is the number of coulombs the caps can hold. In the grand scheme, that won't be much at 12v. geo.
 
Or ? CV exp2 in Joules (watt-seconds) Agree 12 exp2 is only 144. That's why you can use really small capacitors (picofarads) and get a lot of energy stored at high voltage. 144 exp2 is 20,736 and 1440 exp 2 is 2,073,600.
 
WHAT??

The unit of capacitance is named farad, after Michael Faraday. A capacitor of 1 Farad charged to 1 volt holds 1 coulomb--when charged to 20 volts, 20 coulombs, etc. You will not encounter capacitors that big: practical units are more likely to be rated in microfarads, millionths of a farad, or even picofarads, millionths of a microfarad.

College physics Q = C x V. 1 coulomb = 1 farad x 1 volt. Never really seen a one farad cap, have you? One coulomb/second is one amp.

Don't see the advantage of using a cap in a DC battery pack.

geo
 
Hello Geo-TH,In,

Adding the capacitors, I have two, will do two things: The setup will have more power, and voltage will stay higher while under load. Wish I bad a 10 volt cap with 200.000 uf rating to tandem (PARALLEl) with the one I got. Right now I am using a 30 volt 100.000uf. Both are rate at -10 + 75%. Stay tuned!

Guido.
 
Hello Geo-TH,In,

You can buy a 1 farad cap at amazon.com. Rockford makes them, #RCF1 1 Farad cap @ $67.99 Each,

Guido.
 
News to me, How many volts. So tell me again why a capacitor in a jumper pack? How big are you going to use?
 
Hello Geo,

I answered above. 10 volt cap 200k uf and a30v cap 100kuf in parallel. Did you see the 1 farad cap?

Guido.
 
Hello,

Because it works with the pack for a higher voltage output. When it is all done I'll post back.......

Guido.
 
Maybe he's building a peak detector and using the cap to fill the batteries during the drop in the half sine wt since he said it charges to a higher voltage, relying on the rectifier(s) in the rectifier ckt to function as his blocking diode. Otherwise he could be using the cap for a low impedance source like in pulsed operation, aka operating a flash bulb with a battery that's not rated for high current. Purpose of the batteries would be to recharge the cap and the cap would do the work. That's when the "stored energy" equation of ? CV exp2 comes into play....volt-amp-seconds......more of a pulsed energy equation rather than a DC Coulomb energy transfer rating type thing.
 
OK clear as mud. Scratching my head trying to figure out how caps work in a jumper box. Most large caps are leaky, thinking it will self discharge batteries.
 

Bowser, That one farad cap will weigh 3 lbs by the time you get wires/terminals attached to it. Remember, the cap will only discharge, from charged voltage to the cranking voltage, during starting. Maybe you want a couple of those.

Keep us posted.
 
Hello Indiana Ken,

You are right! I do not have a 1 farad cap. I have two DC caps, one is 10V the other 30 V. I posted the other specs on my other replies. Any way here is the procedure for the setup. Hook up the caps to the weak battery, they will get a partial charge. then hook up the pack, and let it fly. believe or not Just hooking up the caps will make the battery come to life, YEA! it works. A week battery may turn the engine over, even for only a few turns without any other source of power, when it could not with out the caps,

Guido.
 

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