I'm building a bicycle generator and I'm trying to figure out the ideal setup. I'd like to be able to have a battery backup and then charge the batteries while I'm using them if possible. The setup is going to be a 12v dc motor used as a generator going to a 140w power inverter meant for a car ciggarette lighter. I have 3 12v 12ah SLA (sealed lead acid) batteries that were initially used for an electric bike but I might hook up in parallel. I also have this UPS
but it likes to beep at me whenever its doesnt have enough power and I havent tested out how long it will last but I doubt it will power a laptop very long. I've stumbled across this
which has terminals for charging and discharging, which gives me hope. I will probably use this generator to power a laptop/charge my cel phone/ run LED's/ maybe run a fan or a little stereo.
I would like to know if simultaneous recharge/use is possible with SLA, NIMH, NICD, or LION (kind of expensive but will consider) batts. Bonus points for explaining or pointing me to how to accomplish this. Lastly, is my idea for a setup ideal? this guy
who is the master of bike generators says that my idea looses efficiency, but he's kind of hard to follow. here's a bunch of extra links about bike generators from 2000