rpjdevries
New Member
I'm having some real issues with these mpp inverters. I've had 2 running split phase for almost 2 years now. They've worked really well the whole time. Several weeks ago I began connecting a third inverter that would essentially be a charge controller at the moment.
I had just connected the battery cables and ground when things started... The original inverters started throwing f08 and f80 codes. ( High bus voltage and communication error). I've been trying different things for a while. Upgraded firmware checking everything I can think of. The supplier hasn't been much help either.
It seems that whenever we get strong PV input the inverters shut down and give me one of these codes. I just realized this weekend that the one inverter reads about 1.3v higher for battery voltage than the other two and my multimeter.
To me this explains why the won't work together. They both seem to operate fine in single phase mode.
I looked into voltage calibration as suggested by watts 247 but I don't have the equipment to even try. I'm also concerned that there's something more going on since it happened at the exact time I was adding to the system.
I had just connected the battery cables and ground when things started... The original inverters started throwing f08 and f80 codes. ( High bus voltage and communication error). I've been trying different things for a while. Upgraded firmware checking everything I can think of. The supplier hasn't been much help either.
It seems that whenever we get strong PV input the inverters shut down and give me one of these codes. I just realized this weekend that the one inverter reads about 1.3v higher for battery voltage than the other two and my multimeter.
To me this explains why the won't work together. They both seem to operate fine in single phase mode.
I looked into voltage calibration as suggested by watts 247 but I don't have the equipment to even try. I'm also concerned that there's something more going on since it happened at the exact time I was adding to the system.