Hi guys
its been 20 + years since my electronics Schooling and use of.
need a control board to control bistable relays, My bms (battery management system) output is 12 v normally and goes to 0v when a fault occurs Which should turn off relay.
bms is designed to control a regular large contactor (100-200 amp)but their coils draw to much current ( .5 to 1.5 amps) for my application.
solid state relays could work but would loose about 1 volt across contacts
any help with a circuit would be greatly appreciated
I included a sketch with as much info I think is needed
regards
have looked on this site and many others and have not found what I need

 

Just to remove some confusion
bms has two individual outputs each controls 1 relay independent from the other

 

please disregard original drawing use the one bellow
Just to remove some confusion
bms has two individual outputs each controls 1 relay independent from the other
1 to allow or disallow charging
1 to allow or disallow loading

 

Do you have a particular relay in mind?

 

https://files.ev-power.eu/inc/_doc/attach/StoItem/3125/RL709-12V-Product-Specifications.pdf

 

Have you thought about a Latching Relay?
https://relays.weebly.com/latching-relay.html

 

Have you thought about a Latching Relay?
https://relays.weebly.com/latching-relay.html

The one selected by TS is a latching relay (#5).

 

Thank you, apologies to all

The one selected by TS is a latching relay (#5).