Question for those of you who have used an oil filled radiator or some other type of non-inductive AC heater to test/discharge your battery packs (using DC current only)... Is this fine to do with the current flowing through a solid-state mosfet-based BMS like a JK or a Daly? I've done it a lot with setups that use a mechanical contactor, however the one time I tried with the current flowing through a mosfet-based BMS it totally fried the BMS, despite only pulling ~15A on a BMS rated for 100A. So I've never tried it again. I'm inclined to think that it was just a crappy off-brand BMS that self-destructed for other reasons, but thought I’d ask just in case there is some inherent danger in doing this that I’m not aware of.
I just finished building a new pack (72V 50Ah LiFePO4), using a Daly SMART BMS 250A, and I am beginning to load test it. Right now I'm pulling 30A from it using 4 oil-filled radiators, but running the current through an external contactor driven by the BMS output... but naturally I’d prefer to be running the current through the BMS itself to take advantage of the built-in ammeter and coulomb counter. I can’t think of any reason why using these heaters as a load would be dangerous for the mosfet-based BMS, however I am gun shy after having fried one solid state BMS this way in the past. Thoughts? Thanks in advance.
I just finished building a new pack (72V 50Ah LiFePO4), using a Daly SMART BMS 250A, and I am beginning to load test it. Right now I'm pulling 30A from it using 4 oil-filled radiators, but running the current through an external contactor driven by the BMS output... but naturally I’d prefer to be running the current through the BMS itself to take advantage of the built-in ammeter and coulomb counter. I can’t think of any reason why using these heaters as a load would be dangerous for the mosfet-based BMS, however I am gun shy after having fried one solid state BMS this way in the past. Thoughts? Thanks in advance.
Last edited: