On my narrowboat the starter battery just... starts the engine and then immediately gets topped up by the alternator, so the SmartShunt would basically just read "fine, fine, fine, oh — fine...
Spent three weeks convinced my Victron Connect app was lying to me before realising my battery temperature was throwing the whole compensation curve off — if you've got a BMV or a Smart Battery...
Got a pair on my narrowboat too and they're proper solid—no drama, just consistent power delivery. Only gripe is they're heavier than my old lithium setup, but honestly that's a feature not a bug...
Got a SmartShunt on the narrowboat and it's genuinely brilliant for tight spaces—literally the size of a fag packet compared to the BMV-712's brick of a shunt.
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