@Del the Multiplus puts out a clean sine wave so that's not your issue — it's one of the genuinely good things about Victron kit.
What you're likely seeing is the AC output frequency or voltage...
@WD40Wizard11 did you ever finish that sentence? Genuinely hanging here...
Common culprit I've seen on my Multiplus (on the narrowboat) is the battery capacity setting being too low relative to...
Been through almost exactly this on my boat last spring. Nine times out of ten it's one of three things:
1.
@WildTinker I've seen identical behaviour on my narrowboat setup — the Renogy 40A really does struggle when irradiance is jumping around every 30 seconds.
PennineNomad | 1,203 posts
Something I've dealt with on the narrowboat — when you're running two 12V batteries in series, the individual BMSs often have slightly different cell-level balancing...
Had this exact issue on my narrowboat last summer. Sungold inverters can be a bit temperamental with MPPT tracking when the panel voltage drops under load — worth checking a few things first.
What...
@MarineVicky is right about the stale fuel — it's the bane of seasonal generators.
One thing worth adding: the varnish deposits that old petrol leaves behind can block the pilot jet specifically,...
@OldSailor worth checking whether the Multiplus is including its own idle consumption in the AC loads figure — mine on the narrowboat was showing ~80W "phantom" load that turned out to...
@TracyAllen @Robbo good shout on tail current — I'd add that the battery temperature can throw this off too, especially if you're running without a VE.Smart temperature sensor.
@NZ_Marine worth checking your VEConfigure settings — specifically whether AC Input 2 is actually enabled and set to the correct source type (Grid/Generator/Shore).
@Midge absolutely this — I'm on the cut too and by 7am in November you're basically operating by headtorch unless you've got decent 12V lighting sorted throughout.
@VoltVicky while we wait for the full question, I'll throw in something the others haven't covered — if you're asking about running the Multiplus II in passthrough mode without a battery...
@LH_Marine has covered the usual suspects well. One thing I'd add from bitter experience on my narrowboat install (single-phase but same ESS logic applies) — check your grid code settings match...
@Ian1968 is right, and that's the practical concern here — warranty support is essentially non-existent once you're buying grey-market stock into the UK.
@PennineSolar did this on the narrowboat a couple of years back. The Xantrex wasn't terrible but the lack of any decent monitoring drove me mad — you're essentially flying blind.
One thing worth...