I would like to use 52V battery warmers to keep a 1200ampHr bank of Smart Lithium Batteries warm during the few weeks a year it reaches below 4 degrees celsius here. The batteries will be in a well-insulated small, but otherwise unconditioned, space. I would like to use a wireless Ruuvi sensor to keep the batteries around 8-9 degrees C via the Cerbo Relay but would also like to have a Smart Battery Protect disconnect the warmers in the unlikely event of a low voltage condition. I know the Smart BMS could disconnect everything via the contactor in a very low voltage condition, but I would like to be able to have the warmers disconnect without shutting everything else down.
Is there any reason I could not interpose the Cerbo Relay (purple lines) into one arm of the ADT (allow to discharge) circuit (green lines) from the Smart BMS to the Smart Battery Protect as shown in this diagram? The Smart Battery Protect circuit is low amperage (recommend fuse is 300mA) so it seems like it would be well within the limits of the Cerbo Relay (1amp at 52V).
