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diy solar

"Inverter" jk bms low T threshold

hogback

Solar Enthusiast
Joined
Sep 7, 2023
Messages
292
Location
Santa Cruz Mountains
Does anyone know how the low T setting is supposed to function? I set mine to 2degC. I have 8 bms in parallel. If the shed gets near this temp, allowing for error in the bms sensors and transducers, I was wondering if some of them were to stop charging (but allow discharge?) that by the time the hysteresis allowed the 'off' bms to charge, that these batteries would be at enough of a soc difference that a large current would flow when they reconnected, possibly flipping my dc breakers or blowing the fuses, further exacerbating the problem. Thoughts? Thanks!
 
Below the Charge UTP no charging is allowed until the T goes above the Charge UTPR. As discharging is still allowed then the charge % will still drop if loads are applied but where is the extra flow coming from when charging is re enabled to trip a breaker? None that I can think of.
 
I have three JK PB BMS and the temps given are within 0.2C, not enough to allow the V to go that badly different. Use the dry contacts to turn on heaters so they stay above 2C.
 
If it were me I would up the temp a bit to stay f.ex. at 8c, atleast not under 5c.
 
There is a temperature vs. current curve.
How low you set temperature limit should depend on how high a charge current is available.

 

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