I’m working on a lighting circuit for an electric bike. The lights are all 12V LED arrays. The stop and tail lights are automotive, the headlight is an MR16 track light spot light. The battery pack is 48V and there are two places on a circuit board I have available that are switched. One is 53V and the other is 2.8V. I assume this larger one is whatever the battery voltage is, although the wires to the circuit board are small and I don’t think I can draw much power from there. I’d like to use the 2.8V and use that with a relay to send 12V to the head and tailights. The brake light will work similarly and use 5V from the brake lever switches to trigger a relay for that.
I figure the head and tail lights themselves will use 0.8A . There is also a DCDC step down converter (the kind used for golf cart lighting) and I don’t know how much it might add. If I figure if should be below 0.5A. that would be load of 1.3A. So I guess I should be able to use contacts that can handle 2A max OK.
I know they coils need more power to close than remain closed and its not clear just how low the voltage they will close at. I’m thinking that some rated3V might work. I need some help finding something that will work.
Also I’d like to just mount this in an enclosure and don’t really want to make a board to mount the relay. I know there are a lot of Arduiono type relay board assemblies than I could just mount or I could just mount them with a bracket pins up.
Any suggestions on what might work?