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NS Canada | No idea on the specifics of that setup, but one thing to note is that a solar panel will make its peak voltage at dawn of the coldest day of winter, not noon of the hottest day of summer. So there could be a chance of voltage damage to the controller if the panel spike's on the coldest day of the year if they are already spec'd high for gathering all the energy they can during the summer, = therefore over voltage during the winter if conditions permit.
I'd be surprised if this is the reason, but it's a technical possibility as cells may see s ~25% increase in voltage from one extreme to the other.
Edited by Supa Dexta 8/14/2026 03:16
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Lorentz solar pumps
