My background is not electrical so bear with me as I describe the problem.
When a load is added to the system in my house (standard voltage) I see a difference between L1 and L2 voltages that is as high as 20 V. Sometimes it levels out quickly but other times it will maintain the difference (e.g. 112 V and 132 V) for 10+ minutes. Other times an added load will throw both lines to ~126-132 V and then they both go back to ~120 quickly. Problem is not caused by one specific appliance or circuit. To make matters worse, every time a line goes over 130 V the photovoltaic system shuts down and reboots.
I'm not sure what to test to narrow down the issue. Any help or advice is appreciated. Thanks!
When a load is added to the system in my house (standard voltage) I see a difference between L1 and L2 voltages that is as high as 20 V. Sometimes it levels out quickly but other times it will maintain the difference (e.g. 112 V and 132 V) for 10+ minutes. Other times an added load will throw both lines to ~126-132 V and then they both go back to ~120 quickly. Problem is not caused by one specific appliance or circuit. To make matters worse, every time a line goes over 130 V the photovoltaic system shuts down and reboots.
I'm not sure what to test to narrow down the issue. Any help or advice is appreciated. Thanks!