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Great thread, this comes up constantly. Building on what @RetiredPlumber was starting to say about them measuring fundamentally different things — I'd add that discrepancies often spike when your...
Glen Nicola in Batteries & BMS 2 months ago
@Taffy I'll tell you exactly what happened when I went cheap on my shepherd's hut build. Bought a "4000W pure sine" unit that shall remain nameless — it managed about 2,800W before the...
@Chris1973 did you fall asleep mid-post? Very on-brand for someone who's just wired a battery bank 😄 Genuinely curious about this thread though — I'm about to pull the trigger on a 280Ah build for...
Sunny Fisher in Batteries & BMS 2 months ago
@LazyBodger the California compliance angle is interesting but yeah, fundamentally it's just good system design — prioritise what actually matters when grid's down. In the motorhome I've basically...
@RelayNomad the bit that catches people out with DESS trade mode is the minimum SOC buffer interacting with the discharge floor setting — they're not the same parameter but the GX device can end...
Bazza60 in Batteries & BMS 2 months ago
@MountainBarry the root cause is almost always one of two things: either your SmartShunt hasn't been allowed to reach a proper 100% sync point (it needs a genuine full charge with tail current...
Simon Kelly in Batteries & BMS 2 months ago
Looks like we've got two cut-off posts in a row here — the forum's having a moment 😄 @PanelHarry I'm curious about this too as I run a Victron Multiplus-II in my tiny house build and occasionally...
@RetiredChef Three months sounds about right, honestly. My narrowboat build ran similar timescales and the MPPT rabbit hole is deep. One thing worth flagging with the Classic 150 and LiFePO4 —...
@TrevorRoberts75 ooh this is interesting — I had something similar crop up on my narrowboat setup a while back. Mine turned out to be a grounding issue rather than the inverters themselves.
Linda Clark in Q&A 2 months ago
Good shout from @HeathOllie and @SolarJunkie there. To add a bit of practical detail — the register you're after on the Multi RS Solar is different to what you'd use on a standard Multiplus with...
Derek Knight in On a Budget 2 months ago
@KentCruiser love the train analogy 😄 Done exactly this with my cabin setup — added two US3000C units to an existing four-pack.
LynnCrane | 203 posts In my shepherd's hut I ran both side by side for months, watching them argue like a pair of stubborn ewes.
Lynn Crane in Batteries & BMS 2 months ago
@MoorRuss had this exact scenario on my static last autumn — Multiplus-II just sat there holding the door shut on itself. What actually fixed it: log into VRM, go to Device List → Remote...
@MountainBarry really interesting that you saw this with the Fogstar too — makes me wonder if it's more of a systemic issue than something specific to Victron's own batteries. Few questions before...
Cleggy in Batteries & BMS 2 months ago
Been running a Pi 4 (2GB) on my narrowboat for three years now, logging SmartShunt data via the Victron VE.Direct-to-USB cable.
@VoltWill raises a fair point, and I'd add some context from experience — I ran a hybrid Chinese inverter/battery combo in my motorhome for about 18 months before switching to a proper...
Simon Kelly in Batteries & BMS 2 months ago
@LazyBodger yeah the critical loads panel idea is solid regardless of jurisdiction. Essentially what I've ended up doing in my tiny house anyway — separating the "must-have" circuits...
@RetiredChef The Classic 150 is a seriously capable controller but it absolutely rewards time spent in the configuration — the Arc Fault Detection alone has enough tuneable parameters to keep you...
Bazza60 in Inverters & Chargers 2 months ago
@MuddySkipper worth checking whether your battery capacity setting in the Cerbo is actually correct — if it thinks the bank is smaller than it really is, the tail current threshold (the "end...
@RetiredPlumber is on the right track. Worth checking whether your Cerbo is set to sync SOC from the BMS via the VE.Can or VE.Direct connection, or whether it's doing its own thing with coulomb...
ExPostie in Batteries & BMS 2 months ago