Had this exact issue on the narrowboat last spring. Turned out to be the remote on/off wire picking up interference from the engine bay — was floating rather than properly tied to a reference.
Jumping in here because I had near-identical grief after updating my Cerbo on the narrowboat setup. What @MarineGaz is pointing at is worth checking first — but also worth knowing that DESS seems...
The 200W is definitely a compromise, but honestly it's perfect for my use case. I run it mainly for garden office top-ups during the week — laptop, monitors, that sort of thing — rather than...
Been through this exact dance with my garden office setup. Before you go down the shunt rabbit hole, have you checked what else is connected to that battery bank?
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