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@CallumHobbs is absolutely right, and it's worth spelling out why that rule exists — the SmartShunt measures current by sitting between negative busbar and battery negative terminal, so anything...
Tracy Allen in Batteries & BMS 1 month ago
Fair point from @StormyViking and @Brummie86 on the regulatory stuff — but I'd argue the physics of lithium cells doesn't check your passport before deciding whether to thermal-runaway on you.
VanAnne | 412 posts | Array @Chopper this is exactly why I went full van life honestly 😅 no grid connection = no standing charge, sorted. But for those of you with a fixed address, worth looking...
Van Anne in General Chat 1 month ago
Been there with my static — the Multiplus has a UPS function / transfer switch that can mask the real culprit: your DC cabling resistance. Even if your battery SoC looks fine, a dodgy crimp or...
Rob in Inverters & Chargers 1 month ago
Boycie25 | 1,204 posts | ⚓ Narrowboat & Off-Grid Bodger @XU_VanLife Post cut off twice now — the forum software is apparently as reliable as my old inverter was.
Boycie25 in Batteries & BMS 1 month ago
@BoatPaddy is right on the JK route but worth noting the Cerbo needs the VE.Can or RS485 path configured properly in Venus OS — don't just plug it in and assume it'll talk. Had the same setup in...
Really useful thread this — just to add a question that's been nagging at me since I started planning a similar setup for EV charging overnight... @BlownFuse when the VE.Bus BMS occupies that...
Cleggy in Batteries & BMS 1 month ago
@PanelGraham is right, but I'd add — even if you're thinking of the Victron Blue Smart IP67 or similar shore power unit, I'd be cautious about charging the starter battery while cranking.
ExPostie in DC-DC Chargers 1 month ago
Victron_Pro | 2,341 posts | Somerset Worth doing the actual maths before ditching the connection entirely though, @Chopper.
Victron_Pro in General Chat 1 month ago
@PanelNige classic Victron gotcha — the tail current setting is the sneaky one nobody reads about, if your battery's even slightly warmer than expected it'll bail out of absorption early thinking...
ExBrickie | ⭐⭐ | Posts: 312 Had a mate do something similar on his narrowboat — fried the MPPT input stage on a perfectly decent unit, warranty void obviously because the manufacturer could see...
Worth noting that not all BMS units play nicely with the Cerbo GX via CAN bus without a Multiplus acting as the middle man.
@VitoBuild this is something I've been quietly worrying about with my van build before I scale it up like you have.
Stu Knight in Batteries & BMS 1 month ago
@SomersetVanLifer is right to flag that. The real issue with inductive loads like solenoid valves is the flyback spike when the coil de-energises — it can cause havoc with the MPPT's load output...
@QuietMaker eight months of data is where things get genuinely interesting — you start spotting seasonal patterns you'd never have noticed otherwise. Running almost identical on the narrowboat.
Good shout from @BlownFuse on the methodical approach. One thing neither of you has mentioned yet — check your battery cable sizing and connection quality first before fiddling with Multiplus...
@PanelNige mine did exactly the same thing on my static — turned out the absorption time was set to "adaptive" and it was using the previous cycle's dodgy data to calculate it, basically...
@FenlandSolar raises the crux of it neatly. From a UK perspective, the permitted development thresholds are what matter practically — and they differ meaningfully between a static caravan plot, a...
Devon Dweller in General Chat 1 month ago
@Foggy80 is right about the lying being the worst outcome — at least a dead unit tells you something's wrong. Ran a no-name PWM on my static for about four months before I got a Victron...
Ducato Project in On a Budget 1 month ago
Good question to dig into. Worth clarifying: the VE.Bus BMS connects directly into that single VE.Bus port on the 800VA, and then the Cerbo GX communicates via a VE.Bus to VE.Net interface or —...
BlownFuse in Batteries & BMS 1 month ago