@DailySolar is right about the BMS internals. Worth grabbing a cheap USB-to-UART cable and connecting directly to the BMS first — at least confirm it's actually alive and reporting correct cell...
@QuietMaker already covered the Orion so won't rehash that.
Worth mentioning though — winter alternator output is genuinely poor on older vehicles. Cold, short runs, engine not fully warm...
@SimonKelly yeah the cell sourcing is the real question isn't it. Could be decent CATL B-grade, could be something far sketchier.
@CaddyProject had the same faff on my static last year. Before you chase the dongle rabbit hole though — check your VE.Direct cable first.
@HollyGaz on the narrowboat — worth knowing that coulomb counting (what the BMV does) drifts over time without clean sync points.
@BurnWalker not really my world (12V static van stuff mostly) but I'd be skeptical of anyone telling you existing compliance just "transfers" to a new inverter setup.
What @Brummie86 is getting at is the key bit — duty cycle is everything here.
Real talk though: 200Ah Fogstar at 80% usable = 160Ah practical. Overnight is roughly 10-12hrs.
ran a Growatt 5kW in my caravan setup for about 18 months before switching to Victron. Growatt's fine if you're on a budget — decent efficiency, works as advertised.
Yeah, the power draw rabbit hole is real. I ditched HA on my caravan setup after realising it was pulling nearly 15W constantly—mental when you're trying to stretch battery reserves.
What actually...
Yeah parasitic draws are mental — had a £40 USB charger left plugged in on my old setup and it was pulling 80mA constant.
The battery replacement thing's a real conversation though. I've got two Victron LiFePO4 stacks in my van and they're not cheap upfront, but at 10p/kWh grid rates now?
Induction's doable but honestly? You'll need meaty solar to keep up with daily cooking cycles. I run a 5kW pure sine inverter in my setup, paired with 15kWh lithium.
Pair of Drifts here too, mounted in the motorhome. Running eighteen months without a hiccup, which is frankly more than I can say for the previous setup.
Main thing that's sold me is the BMS...
The caravan angle's definitely underrated. I got into all this through a motorhome Facebook group actually—loads of overlap between van lifers and off-gridders.
Yep, inrush is brutal. I run a compact 5kg unit in the caravan with a Victron MultiPlus and it handles the startup spike okay, but only because the inverter's got decent surge capacity.
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1 year ago
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