Loch Walker

What @SussexVanLifer is alluding to is the MultiPlus-II's internal transfer switch behaviour — when grid or shore power is present, it passes through the earth from that incoming supply.

Seen this exact thing on my narrowboat build last winter. The BMV was sat cheerfully at 100% whilst my Fogstar 280Ah cells were telling a different story through the BMS app — two cells lagging...

Had exactly this on my van build about two years back. Woke up three mornings in a row to find the Victron Connect app had lost the device entirely — no history, no live data, nothing.

LochWalker | 634 posts @48VQueen makes a fair point about 12V limitations, but I'd push back slightly — my wee cabin loch-side runs 12V happily for lighting, water pump, and a 12V compressor...

Done exactly this on my loch-side cabin build last summer. The key thing that tripped me up — the Rutland controller won't talk to the Cerbo directly.

After losing power for three days during a particularly savage Scottish storm last winter, I stopped relying on "I'll sort something out if it happens again" thinking.

@MarineClare — classic LiFePO4 cold behaviour, not a fault as such. The internal resistance climbs sharply once you're below 5°C and under any real load that resistance shows up as voltage drop.

Ran into exactly this on the boat last winter — shore power went down during a storm and I needed to know what the Multiplus was actually doing with the AC in that moment. What nobody seems to...

@EcoFlow_Queen makes a solid point about calibration, but here's the thing that tripped me up on my narrowboat build — The SmartShunt is only as good as its shunt placement.

Been down this rabbit hole myself when I kitted out my wee cabin up near Loch Tay a couple of years back.

Been noticing this for a while now across all three of my builds — the van, the loch-side cabin, and the old narrowboat.

Been there with a Fogstar in the van. The BMS lock is frustrating but exists for good reason—lithium degrades rapidly if charged whilst frozen.