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Since September 9th this year, one of my PV strings (PV-L1) is showing random spikes of up to 220 volts with 0A in the middle of the night. What could be causing this issue? Attached is todays graph, which seems normal, and one from a few nights ago that shows the random voltage spikes.

Solar company sent me this diagram that was submitted for approval to my power company. I cant make heads or tails of this, as it doesn't seem to match the standard Sol-Ark 15k wiring diagram. Our system includes 32 400w panels, a Sol-Ark 15k, and six 48v EG4 batteries we will be connecting...