battery charger manipulation

[raedy07]

hi all (hacks)
i have a charger here, originally for a SPECIALISED TURBO ebike, 36V. it's no longer needed for that. i'd like to use it for other batteries - problem is there's no output, probably because sensor/comunication wire (brown, see pic) doesn't get green light from controller. can i manipulate it somehow to always have output? an external BMS should take care of proper charging.

i suppose it's not possible to change it to 48V....?

cheers!

 

[amberwolf]

It's highly unlikley that the design would have that much voltage adjustability--it probably requires a different set of components (primary transformer at the least).

What communication or signalling does this charger have with it's system? You would need to know that in order to trick it into working anyway.

You can connect it to the original system and measure voltages or use an oscilloscope or data sniffer to check for static or active signals. My guess is it would be a static voltage, probably just a feedback such as grounding a provided signal voltage via a specific resistor value, or using a voltage divider or other regulator to take the main battery / charge voltage down to some signalling voltage.

But it could be as complex as serial data exchanged over a one-wire interface. Not very likely, but possible.