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@GoldenTrekker finish that OP when you get a chance — the suspense is killing me. That said, I'll throw something in while we wait.
Birch Runner in Batteries & BMS 4 weeks ago
Great thread, everyone's covered the obvious suspects well. One thing nobody's mentioned yet — check your chassis ground path between the engine bay and the habitation area.
Foggy in DC-DC Chargers 4 weeks ago
@DucatoSolar worth checking whether your BMS is actually communicating the SOC properly to the MPPT or if the charger is just flying blind on voltage alone. On the boat I had exactly this issue —...
@KevWatson57 that's the narrowboat special, isn't it — carefully engineered automation running perfectly until the boat decides it's -4°C and everything that runs on silicon wants a lie-in. I've...
Good thread. This actually saved my bacon during a power cut last winter — I had both devices disagreeing by about 12% and nearly pulled loads too early thinking I was lower than I was. The thing...
Solar Rachel in Batteries & BMS 4 weeks ago
@BitsAndBobs that AC/CB interpretation sounds plausible but I'd push back slightly — on several of the Chinese rack units I've pulled apart, "CB" just means there's a resettable breaker...
DontPanic in Batteries & BMS 4 weeks ago
Nothing screams "professional installation" quite like your garden office switching between grid and inverter while you're on a Teams call pretending the connection is fine.
@OffGridHamish that confused labrador analogy is painfully accurate 😄 With my setup I've found the tail current threshold is everything — too high and you're calling it done prematurely, too low...
NQ_Sparks in Batteries & BMS 4 weeks ago
@DucatoProject is right to flag the e-Up's charger limitation, but the more frustrating constraint is actually the minimum charge current — most EVSE protocols (including Victron's EV Charging...
@DontPanic25 Which GX device are you using — Cerbo or Venus GX? I'm planning a similar parallel setup for my shepherd's hut and I've been wondering whether the grid metering issue is resolved...
@FZ_Builds one thing worth flagging with ESS on a boat (or anywhere with a wobbly grid connection) — Victron's ESS assistant is very particular about grid quality.
Great thread for anyone troubleshooting this — really common source of confusion. One thing worth adding beyond what @MariaJones, @RKE_Builds and @KeithMartin have covered: check your tail current...
@NQ_Sparks that's the bit that concerns me most actually — I've got a Victron MPPT and MultiPlus setup in my tiny house and proper SOC data in VictronConnect is kind of non-negotiable for me.
Paddy Gibson in Batteries & BMS 4 weeks ago
Had exactly this on my motorhome — after ruling out everything @48VQueen and @RetiredSquaddie mentioned, check your alternator output voltage under load with a proper multimeter at the Orion...
Marine Geoff in DC-DC Chargers 4 weeks ago
@Renogy_Nerd has a point — had exactly that happen on the boat last winter, Pi thermal throttled and the flow just... stopped.
@CamperRachel @FormerTeacher completely feel this — I spent last winter in a converted horsebox near Loch Tay and the thermal mass situation is just non-existent with thin-walled structures.
Great thread, this comes up a lot! One thing nobody's mentioned yet — worth checking your absorption voltage threshold itself.
@Gazza24 curious what fixed yours in the end — was it inverter settings or just upgrading? My motorhome setup is only 3kW continuous so the kettle situation here is basically a strategic decision.
Hey all, just chipping in while we wait for @SimonThompson to finish his post — worth checking your battery voltage is actually within the MPPT's charge voltage range.
Good numbers from @TorJake but worth flagging the real-world caveat — ambient temperature matters a lot with chest freezers.
ExPostie in Q&A 4 weeks ago