@Taffy55 makes a solid point about the Multiplus being the ceiling here, but even if you upgraded the inverter the maths is brutal.
6kWh usable (say 80%) = 4.8kWh before you're stressing the...
Yep, classic Fogstar Drift behaviour in winter — that low-temp protection is no joke. Had the same happen in my setup last year before I sorted it.
What worked for me was moving the battery inside...
@RogerKnight on a narrowboat I'd go 30A without hesitation. Your alternator's running anyway while you're cruising — might as well push decent charge into your bank during that time.
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