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Had this exact frustration on my boat install — smaller scale but the same fundamental issue. The MultiPlus II's AC input current limit and the genset's voltage droop under load were constantly...
@VivaroDream one thing nobody's mentioned yet — starting surge. Freezer compressors can pull 3–5x their running current on startup, which can cause some BMS units to trip, especially if your...
Lisa Stewart in Q&A 3 months ago
Had exactly this faff with my JK BMS last summer — the default cell overvoltage protection kicks in way too aggressively for LiFePO4 and you end up wondering why your Victron keeps throwing a...
Ben Jackson in Batteries & BMS 3 months ago
Stone bothies are a proper challenge — that thermal mass works against you in winter but can be brilliant in summer if you get the approach right. My experience is mainly with a static caravan...
Vivaro Dream in Off-Grid Cabins 3 months ago
Been running exactly this setup for about 18 months now at the static van. Got a Pi 4 wired up via USB to the Victron MPPT and a BMV-712, pulling everything into VictronConnect first then piping...
@RockyMender oh god yes, completely. Spent three evenings on the Victron docs last month and came out knowing less than I went in 😅 The MPPT calculator, the VE.Bus sizing tool, the battery...
RetiredChef71 | Posts: 1,204 | Location: — Running a cabin setup myself and went through exactly this debate 18 months back.
Really glad you posted this @OakSoul. I've had a Pi 3B+ doing something similar for about two years now, though I went a slightly different route — using a Pylontech battery and pulling data via...
Odd one this — noticed something similar on my Victron MPPT 100/30 a while back when I was expanding the array on the shepherd's hut. Was rewiring a new panel string and after reconnecting...
FX_Power in Batteries & BMS 3 months ago
@VoltVicky the Sargent systems are a right pain to work around — been there with a static caravan build.
Had the exact same issue with my 48v cabin setup last year. Turned out my battery voltage sense was off — the MPPT was reading slightly higher than actual due to a dodgy connection on the sense...
Same setup in my garden office — Pi 4 running VenusOS, pulling data from a Victron MPPT and a Multiplus via VE.Direct and VE.Bus respectively. One thing I'd add that nobody's mentioned: Node-RED +...
@PartnerAdventure worth ruling out the battery itself before chasing phantom loads — 11.8v on a 12v lead-acid suggests it's sitting at maybe 25% SoC, which could just be a tired or sulphated...
Forest Boater in Batteries & BMS 3 months ago
Been down this rabbit hole recently and thought it worth sharing here. I've got a MultiPlus-II 48/5000 running ESS on the narrowboat's shore power setup — mainly as emergency backup when we're on...
Deano in Inverters & Chargers 3 months ago
Mate, I've been eyeing up those BT cable trays for months and I keep bottling it because my inner sparky is screaming "it's not for that" — but then again, neither was half the aluminium...
NaeClue in On a Budget 3 months ago
@AlanPalmer57 Done exactly this on the Ducato — one 400W array, two separate banks (leisure and starter). The honest answer is: one MPPT can only charge one bank at a time, full stop.
@Spud74 solid setup. One thing worth adding to your stack if you haven't already — write your InfluxDB retention policies carefully.
@WayneJames is right about the scale, but what's actually stopping you from paralleling multiple MultiPlus-II units across three phases?
Had a similar headache last year trying to get my MultiPlus II setup playing nicely with a diesel genset — nowhere near your scale, mind you, but the same kind of "it works until it really...
@LH_Marine and @BordersExplorer have both touched on plausible causes, but I'd want to rule out something more mundane first: battery voltage thresholds triggering absorption/float cycling. On my...