meetyg
Solar Addict
- Joined
- Jun 4, 2021
- Messages
- 1,107
I would recheck all grounding of your system.
Having an additional ground rod could cause ground loops and introduce voltage on various components.
Also, SPDs of this type should not be trusted to open the circuit when overheating, see this (video is of an AC SPD, but same applies to DC SPD):
That is exactly the reason that the SPD should always come AFTER the fuses and/or circuit breakers.
My theory is that either you have some kind of ground fault or a ground loop that caused the SPD to heat up or short (which is by design). But because they were before any breakers, nothing was protecting them and they burned.
It could be a faulty inverter, but if the system was properly connected (SPD and grounds), I don't think that the fault should have caused a fire.
Also, is your PV somehow connected to ground/earth?
I don't mean the PV frame, I mean one of the terminals (positive or negative).
This seems to be unsafe for these high voltage MPPT inverters, as mentioned in the post I quoted.
Having an additional ground rod could cause ground loops and introduce voltage on various components.
Also, SPDs of this type should not be trusted to open the circuit when overheating, see this (video is of an AC SPD, but same applies to DC SPD):
That is exactly the reason that the SPD should always come AFTER the fuses and/or circuit breakers.
My theory is that either you have some kind of ground fault or a ground loop that caused the SPD to heat up or short (which is by design). But because they were before any breakers, nothing was protecting them and they burned.
It could be a faulty inverter, but if the system was properly connected (SPD and grounds), I don't think that the fault should have caused a fire.
Also, is your PV somehow connected to ground/earth?
I don't mean the PV frame, I mean one of the terminals (positive or negative).
This seems to be unsafe for these high voltage MPPT inverters, as mentioned in the post I quoted.