MMPT 2 Output Issue
I have 10x410w panels installed on a flat roof, configured in 2 rows of 5, staggered one behind the other. They have an identical orientation and mounting angle. The front row is on string 1 (MPPT 1) and the rear is on string 2 (MPPT 2). Through the terrible winter, their outputs have closely followed each other, but now that we are into better weather a discrepancy is apparent. The PV Voltage on MPPT 2 seems to be capped at 155-158v with a near flat voltage curve and output of <2A, whereas the front string is more voltage wild according to solar exposure and output up to 6-7A.
The panels will max out at near 9A, so I should be seeing far higher numbers from string 2. Has anyone else ever seen output capping like I've got below?
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150V is MPPT limit. It looks like with higher temperatures you don't have enough voltage from the panels to provide the current.
You can test it, but joining the two strings together in series on one MPPT.