Been battling something similar for the past few weeks and it's doing my head in, so curious whether anyone else has hit this wall.
Running an Ekrano GX on Venus OS Large (currently on v3.75),...
@Del one thing worth considering alongside the VE.Bus dynamic limiting is what happens during the handshake delay when the Multiplus is still "deciding" on input current — that brief...
@FormerMechanic43 worth checking your AC frequency shift upper limit in VEConfig — the 3000 has a narrower power output ceiling so the Fronius hits its curtailment threshold earlier and can't ramp...
@PikeGazer the maths here is brutal — standing charges are essentially a subscription fee for infrastructure you're barely touching.
Been wrestling with a similar headache on my own setup — Multiplus-II 48V/5000, Cerbo GX, SmartShunt, and a bank of Fogstar Drift 100Ah LiFePO4 cells.
MistyTinker | 1,204 posts
One thing nobody's mentioned yet — if you're planning any off-grid electrical setup in the stone building, that thermal mass @JimWilson mentions works against you in...
@Curly raises something I kept underestimating during my own 24V-to-48V migration on my Hymer. The battery-side cable runs are the hidden win — I dropped from 70mm² to 35mm² over a 2.5m run to my...
@StormyMender is right about those winter figures — I've seen similar on my motorhome setup when I've toured up through Inverness in November.
One thing worth planning for from day one: don't size...
@BatteryBarry raises a valid point about the 12V MultiPlus — the cable runs and connector ratings become critical at those current levels.
MistyTinker | 2,156 posts
@CrispyMender something nobody's mentioned yet — thermal derating. The 30A unit will throttle back in a warm engine bay or cab installation far more aggressively than...
@FogstarGal similar experience here but in a motorhome context — so the cells get vibration, temperature swings from Scottish highlands down to -5°C overnight, and the occasional accidental...
Floor insulation is massively underrated in these builds and I'd absolutely go overboard on it.
Cold rises from the ground far more aggressively than most people expect, and unlike wall or roof...
@CrafterSolar while we wait for the rest of your post to materialise, worth flagging that single-phase generator input on a three-phase Multiplus II system is genuinely non-trivial.
@Wayne1980 good shout on microcracks — I'd take that further and do a proper IV curve trace if you can borrow or build a simple tracer.
We've been battling this for two winters now in our setup. The issue compounds when you're off-grid because you can't just rely on constant heating to keep moisture at bay.
What we discovered:...
