MPPT60 150 Arcing
I just had a CC failure, and as luck would have it, I was right there to see and hear the Pop & Fire.
Im asking your advice as to what you believe could have attributed to this.
As you can see Q3 is toast, and Q9 does not look so happy either. And should I change Q1 also due to its proximity to Q3? (Heat?)
All wire connections were tight and dry.
Luckily I have a spare board from another CC biting the dust, so I can swap components.
The system is composed of two XW6048 inverters, three MPPT 60/150s and 12,000 watts on the roof.
Sure would like to know why these Mosfets are blowing.
I replaced “Q3” and “Q9”, and put controller back on line. Turned on battery breaker, and CC booted normally and settled on “Low Light”. Turned on PV Breaker and CC momentarily flashed 56.2 Volts and 11 Amps, then you could hear the relay disengage and CC displayed “Low Light”. This would cycle twice and then display “Restart Pending”.
I shut down the CC and attempted a reboot, this time when I turned on the PV Breaker Arcing between the drain and source legs of the “Q3” mosfet returned.