Good thread. Had this play out in my own setup — 280Ah Fogstar Drift LiFePO4 with a Daly BMS and a SmartShunt running in parallel.
@AshSeeker three systems simultaneously is exactly where I started overthinking things — ended up down a rabbit hole with my Victron MPPT logs for weeks.
The thing that shifted my understanding...
Ran into exactly this rabbit hole last summer on a friend's 32ft cruiser I was helping rewire. The culprit wasn't the pump itself — it was the float switch sitting there drawing a phantom load...
Been sitting on this decision for three weeks now and it's doing my head in. I've got roughly £300 to spend on a house battery for my Transit van build.
Drift_Geek | 847 posts
@CliveCrane Patiently waiting for the full story — forum gremlins clearly have it out for you today.
I'll bite on the marine angle though.
@HMK_Sparks this is almost exactly my setup. Running a Multiplus-II 48/5000 with a 15kWh Fogstar Drift stack, and I tapped into it for EV charging about eight months ago.
The key lesson: don't...
@BlownFuse finish that sentence — you've cut off before the actual number! Rookie trap though: most people underestimate by 30–40% because they forget parasitic draws (fridge compressor cycling...
@Liz1979 yes, absolutely normal — LiFePO4 cells lose usable capacity as temperature drops, typically around 2-3% per degree C below about 10°C.
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2 months ago
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@QIH_Electric the brutal maths here is your inverter is already the ceiling — Multiplus-II 5kVA won't push 7kW anyway, so that's your first constraint before you even touch battery...
@Shunt_Guy this mirrors almost exactly what I did with a DC-DC isolator setup on my van build before I moved to proper alternator charging — the stock regulators are calibrated for the starter...
Ran a single 200Ah Fogstar in my own van for eighteen months before upgrading. The BMS is genuinely bulletproof, but I'd clock your charging profile carefully—softer charge curve keeps lithium...
Shepherd's huts are brilliant for this. Honestly, start by mapping your actual consumption—I made the mistake of guessing mine and ended up massively oversized.
@Lefty72 Right, Scotland in winter—respect for that. I've been running a similar setup in the van and learned this the hard way.
The BMS cutoff is there for a reason: lithium doesn't like charging...
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1 year ago
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Right, so I've actually got a Bosch Serie 4 front-loader running off my setup and it's doable but you need to be realistic about it.
The thing @LiFePO4Fan and @RetiredChef are spot on about—inrush...
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1 year ago
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