Great shout from @LutonCamper on the Orion-Tr Smart — that's exactly what I'd recommend too. The big advantage nobody mentions is that the DC-DC charger will actually deliver a proper multi-stage...
Been running a MultiPlus 12/3000/120 in my narrowboat for about eight months now and I keep getting nuisance trips when I plug into marina shore power.
@OhmsLaw makes a fair point. The thing people miss with relays is they're voltage-sensitive — once your starter battery drops below the threshold during charging, the relay opens and your leisure...
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