MPPT, PV input shorted ?
I have two SmartSolar MPPT 250/100 one connected to 2 rows of 4x 395W and the other to 2rows of 5x395w solar panels. The system has been running fine for approx 2years, but one do not start up, blue LED blinks slowly. Voltage on PV input terminales is zero volts, but when connection is opened the solar panels show up to approx 200v in the middle of the day. On closing the switch PV terminals show zero volts. The PV input of the MPPT is in a protection mode - pv short relay.
The mppt is a HQ2211. On early models, the pv short relay reset itself. Victron did introduce a pv short relay on HQ2150, which should be able to be reset manually and the next generation HQ2250 was updated due to a design fault, because the pv short relay between model HQ2150 and HQ2250 wouldn’t reset as expected and simply needs replacing(complete unit)
https://invertersrus.com/wp-content/uploads/2022/12/Smart-Solar-MPPT-250-100-VE.Can-PV-input-protection-HQ2150.pdf
I now have the one mppt replaced but I worried that my other mppt with same design fault will break after warranty period.
Anyone having experience with these mppt’s with this design fault? Victron dealer could not find the reason for the error, so I am worried and it’s also a very expensive unit.
