So what happens to BP 65 if I try to draw more than 65A for longer time?
It depends what "longer time" is.
I have a BatteryProtect 220 and have usually loads up to 180A @24V on it but occasionally I have two motors running in parallel and overload the BatteryProtect 220 to 450A.
From the Datasheet, it can be overloaded by 1min up to 600A.
The BatteryProtect 65 can be also overloaded for 30sec with 250A.
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