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Posted for the benefit of the people here that assemble their own lithium batteries. Check out the amount of casing plastic that protudes over those FETs. Even though there is a thermal pad involved that casing plastic can't be helping with heat conduction & dissipation. The silpad itself is even covered by the casing plastic in places. Quite surprising given the price of a Daly BMS. Caveat emptor.
Check out the amount of casing plastic that protudes over those FETs. Even though there is a thermal pad involved that casing plastic can't be helping with heat conduction & dissipation.
So I don't think these FETs will be dissipating much heat. They are simply on/off switches, and a large number are used to try to prevent them from "fusing on" with a short circuit / high surge load. I would expect any heat generated to be extremely minimal.
And then of course there's the 0.03A (max) balance things...little resistors with transistors to turn 'em on. Next to useless on the large battery banks often used in off-grid systems.......
Gets hot enough to justify a couple of decent heatsinks and a fan ...