We recently had solar designed and installed by Sullivan Solar in southern California. Limited by roof space, they designed it as a 15 panel south facing array and a 9 panel west facing array using Kyocera 270W panels and one SMA SB6000TL-US-22 inverter. After installation, I discovered that the south array was split into two strings, one with 7 panels and the other with 8 panels, connected in parallel to one MPPT input while the west array is connected as one string to the second MPPT input. From the research I've done, connecting unequal strings in parallel isn't recommended, but how bad is it? How much efficiency am I losing from this configuration?
I have asked them to exchange the inverter for a SB6.0-1SP-US-40 inverter, which was recommended by SMA for this configuration, but they refuse. They state that it's currently exceeding production estimates for February and they will monitor it going forward.
I have asked them to exchange the inverter for a SB6.0-1SP-US-40 inverter, which was recommended by SMA for this configuration, but they refuse. They state that it's currently exceeding production estimates for February and they will monitor it going forward.
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