Low efficient PV generation on PowMR AIO inverter

[vberegovoy]

Hi! Trying to figure out why my inverter using only around 40% of solar power.
I have PowMR POW-HVM-5.5H-48V which have meshed bottom cover. I have 4x410W PV LONGi panels with next params:
Max W: 410
Voc: 37.25V
Vmp: 31,25V
Isc: 13,88A
Imp: 13,12A

So technically Open voltage is around 149, and under full load around 125.
Min PV voltage is 120v for my inverter. My friend live near me, and has 24v 4200W inverter from PowMR with 90v of minimal PV voltage, and same 4 panels. He has solid 1200W+ from his panels at around 110v of PV. My PV voltage is always around 130-135v, and sometimes it somehow drop to 120, and then i suddenly got power spikes to around 1200W. But usually on direct solar i have 130v or solar panels and 600-700W in battery mode. If i got Grid+Solar mode - my solar panels provide no more than 200-300W with direct solar.

On screenshot, Orange is PV voltage, Blue is Power, and here is image. Lower PV Voltage - higher PV Power. But i don't know why Inverter hold on 130-135V instead of load panels to 120v. Idk how to get 1500W from solar panels actually.

Battery is 9KW LiIon cells from Hundai Kona, but it does not matter in this situation

 

[vberegovoy]

Is my inverter just need more PV voltage? Is adding PV panels can change situation?

 

[DJAY]

Just a guess but I believe the mppt voltage range might be 120 to 450V. In that case the voltage would be on the low side. I would add at least 1 panel to keep the voltage above 150. The higher the voltage the better.

 

[vberegovoy]

Just a guess but I believe the mppt voltage range might be 120 to 450V. In that case the voltage would be on the low side. I would add at least 1 panel to keep the voltage above 150. The higher the voltage the better.

You are right... On hot day voltage of panel drop to 25-27v and total voltage drops to 105-110v. I added 1 panel, so "minimal" voltage now about 150v, and have full efficient with no problem. Thank you!