BroMikey's Capacitor Dump Circuit

[TinselKoala]

Ditch the mosfets and use a mechanical switch like a beefy double-throw relay or a solenoid-driven contactor. You can keep the contacts from welding shut by using the right capacitor across the contacts. Trigger the relay with a single mosfet driven by the Wiley Coyote control circuit. The relay's NC contacts can control the cap charging before the dump, then when you fire the relay the NO contacts close and dump the cap charge into the battery.

[SeaMonkey]

Aye, the old fashioned approach with electro-mechanical
heavy duty relays is always good.  An automotive starter
relay or starter solenoid relay may be able to handle the
job with ease.

[Hoppy]

Ditch the mosfets and use a mechanical switch like a beefy double-throw relay or a solenoid-driven contactor. You can keep the contacts from welding shut by using the right capacitor across the contacts. Trigger the relay with a single mosfet driven by the Wiley Coyote control circuit. The relay's NC contacts can control the cap charging before the dump, then when you fire the relay the NO contacts close and dump the cap charge into the battery.

Agreed. I have in the past used an old multi-pole AC contactor and re-wound the coil for DC operation.

[Farmhand]

I came to the conclusion that without some way to have the setup turn itself off I would need to keep checking it. So I went to a very simple picaxe setup which could sense the input and battery voltage. I also agree with others that say to recondition a battery they should be done separately. They can be better assessed individually as well. The circuit attached below is one I began with that I tested with a 17 volt input from a wall transformer and amateur code, I think I drew it correctly. I then used it with some different code and a solar input. I coded it to sense the battery voltage between pulses. I do realize I'm dumping through a diode but it's a good one and I needed it to sense the battery voltage. I modified it and built another circuit and wrote new code for a dual coil boost converter

The solar circuit is still on a solderless board  but I'm not using it for a while anyway.

Anyway the basic switching setup with the mosfets is very sharp it makes the wires ping real good and I can pick up the ringing in the wires to the battery with another coil connected to my scope 4 meters away. I think the pinging affects me adversely, needs shielding I think, sounds nasty on the radio. Boost converter has paralleled smoothing caps so it doesn't have that issue. It's good to be able to plug it into the laptop and change the code to try different stuff. No need for the 12 volt regulator if a 12 volt battery is used for the supply. It can be coded to stop when the supply goes too low as well.

I don't think it necessary to use so much capacitance and voltage to dump to recondition a battery, it takes time though, a battery can't be desulfated overnight if it's sad to begin with. Slow and easy wins the race I think. I think proper discharging of the battery is important, placing a good load on a battery after it holds over 12 and a bit volts to discharge it with appropriate amp draw for the battery does wonders.

I also fear a battery explosion if too much voltage is used, especially if the battery is suspect in condition.

Cheers

[totoalas]

Patrick's comparator  ckt  as discussed in energyscience forum  ultimate cap dump
And Peter lindermans interview by Aaron  talks about solartracker 5
Radiant or inductive charging was changed to capaci tive charger  with 15.2 v float charge
Using dc linear amplifier desi .gn

Opting to use scr   maybe the future