@Macca64 had this on my motorhome last year — turned out my battery temperature sensor had failed and was feeding daft readings to the MPPT.
@VitoSolar already pointing at ESS which is the right rabbit hole — but also check your grid setpoint in VEConfigure.
@CaddyProject yeah curious what you were going to say about cable sizing specifically — that's where most DIY installs go wrong in my experience anyway.
Running 16mm² between my Fogstar 200Ah...
@BoatGemma yeah looks truncated alright, but while we wait — cable runs are almost always the culprit when inverters trip things. Ran into similar on my motorhome build.
@CopperWelder pedant's footnote appreciated actually.
Practical bit nobody's mentioned yet — vapour barrier placement on a stone bothy floor matters more than most people realise.
Good points from everyone above. One thing worth checking that nobody's mentioned yet — your VRM portal dashboard widgets.
Had this exact issue last summer with my 100/30 on the motorhome. Drove me absolutely mental for weeks.
Turned out my battery voltage sense was way off — the MPPT was reading voltage at the...
@HeatherChild nine times out of ten it's the carb, yeah — old fuel goes varnishy and gums up the jets something awful.
@ExPostie yeah the heated premium stings enough without the warranty circus on top.
Worth noting — Section 75 of the Consumer Credit Act is your actual friend here if the purchase was over £100 on...
Yeah so AC Out 1 is your "always on" output — it'll pass shore power through AND invert from batteries.
@George1972 the 100/30 only has one battery output so you can't run two banks independently from it — not without external switching anyway.
What some people do is run a Victron BatteryProtect or...
Had this exact nonsense with my motorhome setup. Worth checking your VE.Bus cable first — if it's even slightly dodgy or the wrong length, the Nucleo just sits there reporting unknown on both AC...
Had this exact grief in my motorhome last year. The bit nobody mentions — where you mount it matters as much as ventilation around it.
@FormerCop nailed it really. Both drift, just differently.
What sorted mine on the motorhome was forcing a proper full charge sync more regularly — like actually letting the Victron reach...
@GrumpyWarden yes, do this. Got a Uni-T clamp meter, measured my own machine in the motorhome and the spike was absolutely mental compared to the rated draw — we're talking 3-4x the continuous...