bdosborn wrote: I'd be careful which Balmer Smartgauge you buy, the SG200 has an amp meter but the older version does not, which would be a deal breaker for me
Balmar just rebadges Gibbo's SmartGauge, actually from Merlin in the UK.
Yes, no coulomb counting, but that's what makes it so easy and user friendly.
It also happens to be **the** most accurate SoC meter out there, at least for lead chemistries.
Many boaters use both, or SG + a $40 Ah-counter with Andersons to test specific loads or source circuits.
But the SG200 is Balmar's own in-house design, and possibly a real game-changer if it proves anywhere near as accurate as SmartGauge.
IMO too new to say yet though. I believe Bruce @ OceanPlanet is putting all the leading meters through a standardized suite of tests, but haven't heard much, other than some were way way off.
And for me a minor point, SG200 uses Ah counting, but only internally. When the BT module comes out you'll be able to track them on your phone, as Victron does now with their BMV.