recumpence wrote:Yes, they would be parrallel with the battery pack. Normally capacitors just charge themselves according to how much current can be sent into them. Theoretically they have an unlimited recharge speed, though in practice they can only pull power from a battery just so fast.
Basically, an ultracapacitor bank would give out huge current for a few seconds to aid the battery with huge current spikes that would be drawn from it. The battery pack would not see such a huge amp draw, thus drastically reducting the amount of voltage sag seen under load.
Sorry to be a bringer of bad news but the ultracap loses farads when added in series. add the total capacitance up and divide the number of caps and you have the answer.
So 5 X 55 farad caps would equal 11 farad capacitance.
I am working on an idea I got from the zener light buld bms idea of adding a 10 or more caps at 2.5 volts in parralell.
Rig up 4X5 watt Zener @ 6.8 v, 10 X 55 farad cap, 4 X 5 watt Zener @ 5.6 onto the battery terminals, the zeners need to be reversed and block all voltage below 12.4 volts if you pull regen the caps will deliver that current as long as the the first zener is open to 6.8 volts (or whats left of the battery when sagging) and the second one is open at 5.6 from what is left of the battery after going through the 6.5 drop and the 2.5 volts potential that the capacitor is holding holds zener 2 open at 5.6.
From what I figure you can get a voltage sag of below on a 12 volt battery of down below 10 volts before the 5.6 volt zener will cut out.
This is all in theory as I havnt got any zeners big enough to cope with regen current but the theory need some development, ive almost got 10 caps ready to try out.
The reason why i chose 10 caps is because I estimate the legs will be lucky to push 4/5 amps at that voltage at most.
I have a led torch I designed some time back and i use ultra caps, it charges with in a blink of an eye and burns for hours. I used 2 X 55 farad caps in series = 27.5
I am dubious to my zener recomedations, so far to say youll need more than 1 amp to deal with regen. Its a concept in the making.
Would a regulator between each cap return the farads?
At 2.5 volts there are plenty of componants that can regultate the greed of anything tied up to regen.
Any voltage higher than 12.7 volts and it gets dumped on to the caps,