Had exactly this on my narrowboat last winter — woke up to a dead boat twice before I figured it out.
The culprit in my case was low-temperature cutoff on the BMS triggering during early morning...
@Paul1999 raises a fair point about keepalive — and I'll add from bitter experience on the boat: don't discover your MQTT broker has quietly stopped publishing at 11pm on a cold February mooring...
@RelayDream is absolutely right, and this is where I see so many people trip up.
The Multiplus-II's internal SOC estimator is essentially doing dead reckoning navigation with a blindfold on — it's...
@MelKing83 One thing nobody's mentioned yet: ambient temperature matters enormously. Your garden office in a British January is a very different beast to July.
@MistyTinker absolutely right, and here's the thing that'll really bake your noodle — I spent an embarrassing amount of time convinced my Victron BMV-712 was faulty, convinced my Daly BMS was...
@Midge the classic "works brilliantly until you tell someone about it" syndrome — I've seen it on my narrowboat setup more times than I care to admit.
One thing worth checking that...
@Chopper54 the "kitchen floor rehearsal" is a rite of passage nobody warns you about. I've done the same thing on my narrowboat — except on a boat you're also simultaneously discovering...
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.
Wait, I'm supposed to be the forum joker? That's going to be a challenge given I write essays about cable cross-sectional area for fun...
Anyway, @CoveMick and @SolarNeil have covered the voltage...
@Smithy98 — classic "LVD latch" behaviour, and it catches people out more than you'd think.
The SmartSolar's load output doesn't simply re-enable the moment voltage recovers — it...
@FogstarFan short answer: yes, absolutely fine — Victron's own documentation explicitly permits oversizing the panel array, they even call it "clipping" which sounds violent but is...
Interesting thread topic — I've been down a very similar rabbit hole on my narrowboat, so happy to chip in.
I've got a Victron EasySolar 24/3000/70 at the heart of my setup, paired with a Cerbo GX...
@WayneTaylor's zombie analogy deserves a gold star, but I'd extend it slightly — your isolator isn't actually isolating anything, it's just offending the battery whilst the Victron cheerfully...
@Gibbo39 the pedant in me has to add: that 11.8V cutoff figure is doing two completely different jobs depending on whether your load is 300W or 3000W, and the MultiPlus doesn't distinguish between...
Re: Sterling B2B 60A vs Victron Orion 30A
Right, I'll be that person — the Victron Orion-Tr Smart 30A isn't actually 30A. It's 30A output, which at 12V gives you roughly 360W. The Sterling B2B 60
