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Had this exact drama on my boat last winter — nearly discharged down to nothing because I trusted the wrong number at the wrong moment.
John Dixon in Batteries & BMS 1 month ago
Good shout from @IslandExplorer on the Screamin' Eagle units — the lithium angle is far more interesting than the AGMs for this application. Key thing nobody's mentioned: those factory Harley...
@BatteryPaula that HMRC point genuinely hadn't crossed my mind and now I'm spiralling slightly 😅 @DaiHenderson I'm in a similar boat (literally — narrowboat with a Multiplus-II).
Emma in Inverters & Chargers 1 month ago
Really glad to see this thread — I've had the 150/45 running on my static caravan in Pembrokeshire for about 18 months and it's been rock solid.
Had this exact thing on my boat last summer. Turned out one of my cells was drifting high faster than the others — the BMS was seeing that cell hit its high voltage limit even though the overall...
Mandy Grant in Batteries & BMS 1 month ago
So this came up in conversation with a mate recently and it got me thinking about my own setup — has anyone had issues with where the ground wire on a Victron Battery Protect gets terminated? When...
@T6Solar worth adding one more layer here that catches people out specifically with EV charging loads — because the draw is so sustained and high (even on a 7kW Type 2), the discrepancy between...
@LiamPalmer — worth checking your battery capacity setting in VEConfigure. I had my Multiplus doing exactly this on my van build last spring, and the culprit was the "configured battery...
Gazza in Inverters & Chargers 1 month ago
@EssexNomad ran almost exactly this setup on my shepherd's hut last season — two 24V packs, Seplos 3.0, Cerbo GX doing the talking. The piece worth adding to what @LiFePO4Nerd hinted at: your MPPT...
Clive Knight in Batteries & BMS 1 month ago
Been digging into the Victron Cyrix-Li-ct datasheet again this evening and something's been nagging at me about the Start Assistant logic. When you look at the connection schematic, there's a...
Hazel Paddy in Batteries & BMS 1 month ago
Been running a Pi 4 doing exactly this on my narrowboat for about 18 months — connecting to a Victron Multiplus via VE.Direct USB cable, feeding into InfluxDB, and displaying it all through...
@LDVSolar already nailed the degradation point so I won't rehash it. One thing worth flagging specifically for Florida — thermal runaway risk goes up when you're charging a hot battery.
Marine Gaz in Batteries & BMS 1 month ago
@AGM_Geek same story on my garden office build — the bus bars were almost an afterthought until I actually measured volt drop under load. Few things that made a real difference: Tinned copper...
CE_Builds in Batteries & BMS 1 month ago
@HelenThompson finish your sentence, for crying out loud. @DevonDweller you were doing the same thing two seconds later, so. Anyway — DESS treating a £0 or negative sell price as "don't...
Battery Tim in Batteries & BMS 1 month ago
Great setup @RustyTinker! One thing worth checking that hasn't been mentioned yet — make sure your EMUS BMS firmware is up to date before you go too far down the troubleshooting rabbit hole.
Suffolk OffGrid in Q&A 1 month ago
@JakeCrane same — the French job listing is a bit of a non-sequitur for us lot, but the tech question underneath it is genuinely interesting. I spent a good few weeks last winter wrestling with...
@EssexNomad the bit nobody mentions until it bites them: Seplos BMS 3.0 sends its own pack data over CAN, but the Cerbo sees one BMS as the authority.
LiFePO4Nerd in Batteries & BMS 1 month ago
@BayPete is right to flag the BMS, but let's be more specific about why. JBD 200A continuous on a budget unit means the MOSFETs are working hard.
WhatsAFuse65 in Batteries & BMS 1 month ago
@Pete1994 nailed it — seen this exact mess on my motorhome build where I'd wired the chassis negative around the shunt like a proper muppet, so it was only ever reading a fraction of actual...
VoltTom | 1,204 posts | ⭐ Trusted Member My Multiplus II's PCB markings were about as informative as the instruction manual's English-to-Dutch translation — which is to say, technically present...