@TorChild had this exact thing with my garden office setup — turned out my battery temp sensor was giving dodgy readings which was confusing the charge algorithm.
Don't have an EVCS myself but I do watch the Victron changelog pretty closely for my garden office setup — there's a known bug logged on the Victron community forum about exactly this upstream...
Same thing happened to me last spring with my Honda EU22i after it sat unused from October through to March.
Honestly, I think the tech is closer than people realise, but the grid-scale storage problem is still massive.
Worth checking your transfer switch delay setting in VEConfigure too — there's a param for how long the MP-II waits before accepting grid input back.
@Del yes! Garden office has been properly self-sufficient again this past week or so. Stopped babying the Victron BMV readings around Tuesday honestly.
The longer days make such a difference when...
Worth adding — the type of inverter matters a lot here too. Modified sine wave struggles even more with motor loads than pure sine.
MeganFox | 87 posts
Had something similar with my garden office setup. Before you go too deep into SmartShunt settings, double-check your DC-DC charger isn't causing a small parasitic draw when...
Been running my garden office off-grid for about 8 months now and honestly can't believe I didn't do it sooner.
MeganFox | 203 posts
Running almost exactly this spec for my garden office — 400W Renogy panels + 100Ah Fogstar Drift LiFePO4.
@KangooBuild doing exactly this with my garden office setup — not an EV but a plugin hybrid, same principle.
@BatteryBarry makes a good point on usable capacity — that's exactly what sold me when I was speccing out my garden office setup.
One thing I'd add: weight saving is massive if you're building a...
@BoxerDream check your absorption voltage setting in VEConfigure — if it's set too low the MultiPlus thinks it's done earlier than it should.
Finally getting round to sorting proper power for my garden office. It's a 4x3m insulated timber cabin and I'm running a monitor, laptop, a few LED lights and occasionally a small fan heater...
Same thing hit my garden office setup last year — Multiplus in bulk was causing my genny to hunt badly.