I'm using five inverters I bought from you. Connect them to two 150W solar panels, this one https://www.aliexpress.com/item/1005004241513780.html . It says the spec below:
Maximum power(Pmax) 150W
Output tolerance ± 3%
Maximum system voltage 700V DC
Open circuit voltage(Voc) 21.6V
Maximum power voltage(Vmp) 18V
Cell efficiency 23%
Operating temperature（NOCT） 45±2℃
Temperature range -40℃～+80℃
So I connect two panels in serial, as if it is 43.6V Voc, 36V Vmp panel. It perfectly matches your inverter spec, right?
I started using two inverters 13 Feb after I received them prior to other three inverters. And started monitor their power generation by a smart plug. Smart plugs with power meter use hall sensor to measure current they pass so it can measure back current that panels and inverter generates as "consumption." It perfectly worked.
But the day before yesterday, I noticed some mysterious drop on the generation output. It was very fine sunny day so I should get nice wattage generated, but the measured current is about half of I expect.
I went to the roof and found one inverter stops working. But I touch the inverter, it starts again.
Prior that day, I received the packet contains the three (rest of five I ordered) inverters so I expand my power plant for eight panels and four inverters. I replaced the inverter stopped with new one, and connect it separately at backyard for testing.
Finally I noticed the inverter in trouble dead. It doesn't start working after sunrise, and doesn't start after I checked and reconnect the plugs from panels to the power plug.
What should I do?