Latest MPPTs less accurate?
I had a 1908xxxx series Sunsynk 5,5 KW machine which had an issue and it was refurbished with all the internal boards replaced and received a new 2202xxxx series serial number. All is working well again except for something I noticed.
Inverter with serial number 22xxxxxxx inverts 92W AC from 258W DC solar available. 92/258 = 36%
Inverter with serial number 19xxxxxxxx inverted 221W AC from 253W DC solar available. 221/254 = 87%
Anyone have an idea what could cause such a big discrepancy?
All wiring, solar array, battery, Ct coil has remained constant. CT coil was checked and installed correctly and is accurate before and after.
Excuse the ancient photo using the old firmware, it was the only one I could find that had the same solar power to compare against.
20W grid trickle feed.