Hello everyone and thanks in advance. Forgive my ignorance on anything I may say, I'm new to this. I've built a few guitar pedals and simple projects but I'm not educated in anyway about electronics except for the little bits I soak up online.
I put together an ebike and made the battery pack from 3 12v 10Ah SLAs. I have them wired in series for riding but to charge them I disconnect everything and reconnect them in parallel and charge them from a 12v 2A charger. This is a pain in the butt, I'd much rather charge them in series. I can get a 36v charger on ebay for under $20, less then I could build one for, but they all seem to be 2A output which would be too high to charge my 10Ah batteries.
My question is, is lowering the output to 1A as simple as putting a 36 ohm resistor between the charger and the 36v pack? Am I right in thinking this resistor needs to be rated for 36w? I was thinking 3 100 ohm 15w ceramic resistors in parallel would get me close enough and more then cover the 36w. Am I right in expecting a voltage drop of 1.2v? Would this be too much? Do you have any better ideas?
I put together an ebike and made the battery pack from 3 12v 10Ah SLAs. I have them wired in series for riding but to charge them I disconnect everything and reconnect them in parallel and charge them from a 12v 2A charger. This is a pain in the butt, I'd much rather charge them in series. I can get a 36v charger on ebay for under $20, less then I could build one for, but they all seem to be 2A output which would be too high to charge my 10Ah batteries.
My question is, is lowering the output to 1A as simple as putting a 36 ohm resistor between the charger and the 36v pack? Am I right in thinking this resistor needs to be rated for 36w? I was thinking 3 100 ohm 15w ceramic resistors in parallel would get me close enough and more then cover the 36w. Am I right in expecting a voltage drop of 1.2v? Would this be too much? Do you have any better ideas?