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Battery circuit breaker trip


Solarsmit
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Good evening, I have a GROWATT 5kW inverter and 1 x 3,5kWh Pylontech connected.

The 150A circuit breaker trips intermittently. Do I change the circuit breaker to fuses?

The inverter does not pull the utility in when the load gets a bit high, over 2,2kWh

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On 2021/05/11 at 8:20 PM, Solarsmit said:

Good evening, I have a GROWATT 5kW inverter and 1 x 3,5kWh Pylontech connected.

The 150A circuit breaker trips intermittently. Do I change the circuit breaker to fuses?

The inverter does not pull the utility in when the load gets a bit high, over 2,2kWh

i am having the same issue. I have a Sunsynk 5.5kW with 2x5,1kW batteries. I have a 125A DC breaker installed on the battery feed and it also trips intermittently. There is no way my batteries can discharge more than 125A, as I have set the max power discharge from the battery, so worse case it would be around 104A when the battery voltage is really low and I use all of the 5kW (which I do not even come close to). The most I have seen was around 60-70A. Obviously the logger does not show any detail as it only updates every so often.

Seems like breakers are problematic on DC circuits and I am also considering replacing the battery breaker with slow blow fuses.

I am curious to hear other's that experienced the same and what their fix were.

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21 hours ago, YellowTapemeasure said:

I've never had that problem with these and 3x Pylontech US3000B

 

IMG_20210517_205353[1].jpg

I am definitely installing fuses. I had 2 trips today and I measured the current just before tripping. The breaker is rated for 125A DC, but with a sustained 67A it trips after about 6-10min...

If a breaker is rated for 125A it must be able to sustain 125A, but not in my case. Don't know if it is a faulty breaker or if these Chinese stuff does not honour its rating...

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