docrocket
1 W
- Joined
- Apr 12, 2018
- Messages
- 52
I have a 36v system with two batteries, one 20AH, and one 10AH. I know most folks here would put them in parallel and just disconnect them for charging, but for various reasons, I want to carry both batteries and switch between them at will.
I bought a 3-way toggle switch - A on, A&B off, B on. Turns out of course that I got an AC switch rather than DC but according to the AC-DC calculator I found, that switch should be able to handle 76 amps at 36v. Which is more than twice my peak load so I should be OK on that.
However, I'm not sure how to wire the darn thing. It has three screw terminals (one for A, one for B, and one for the power out to the controller). I understand that the positive wire from each battery should go to A and B and that the power out wire should be the positive wire to the controller.
But what do I do with the negative wires? I've seen 'ground them to the bike frame' and I've seen 'connect them to each other' neither of which I am comfortable doing without one of you guys with the enormous brains explaining how it's safe/cool/functional.
Thanks for any help.
I bought a 3-way toggle switch - A on, A&B off, B on. Turns out of course that I got an AC switch rather than DC but according to the AC-DC calculator I found, that switch should be able to handle 76 amps at 36v. Which is more than twice my peak load so I should be OK on that.
However, I'm not sure how to wire the darn thing. It has three screw terminals (one for A, one for B, and one for the power out to the controller). I understand that the positive wire from each battery should go to A and B and that the power out wire should be the positive wire to the controller.
But what do I do with the negative wires? I've seen 'ground them to the bike frame' and I've seen 'connect them to each other' neither of which I am comfortable doing without one of you guys with the enormous brains explaining how it's safe/cool/functional.
Thanks for any help.