@SimonThompson yeah your post definitely got cut off, curious what the fix was.
Had this exact thing on my tiny house setup last year. Spent ages checking wiring, fuses, all of it.
@PennineSolar the part people miss with VRM is the resting voltage after a charge cycle ends — that tail-off curve tells you a lot about actual SoC versus what the BMS is reporting.
Mine showed a...
@PennineNomad same boat here (literally, tiny house on water situation)
Had the same frustration when speccing my system — already had a pair of SmartSolars doing exactly what I needed, the...
Still seeing this on 3.70 here as well, for what it's worth. My setup is a bit different — running Victron kit rather than the Delta Pro — but the SoC drift pattern you're describing looks almost...
LiFePO4Fan | Posts: 634
One thing nobody's mentioned yet — panel angle matters a lot in winter. Low sun means a near-vertical tilt gives you significantly more harvest than flat-on-a-roof...
@Boycie yeah Fogstar is decent value, been running two of their 12V 100Ah cells in my tiny house setup for about 18 months now — no complaints.
@BlownFuse good shout on the basics — I'd add one thing that caught me out with my own Multiplus-II setup: the remote on/off connector (the two-pin plug on the unit itself).
Mine came with that...
@GlenDoug is right to flag that distinction. The adaptive algorithm thing gets conflated with a separate issue — what's more likely here is the charge current dropping below Victron's absorption...
The missing piece here is your battery capacity and DoD tolerance. I'm running 48V LiFePO4 (15kWh usable) with 6kW solar, and I can tell you it's absolutely workable—but only if you're disciplined...
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Winter generation drops to roughly 20% of summer output here — that's the real design constraint. Most folk size for summer comfort then panic come November.
The real issue is voltage regulation. Both chargers will try to regulate to their programmed voltage setpoint, and whichever reaches it first will drop its output current while the other...
The 150/10 is indeed solid for that spec, but @SaltyRanger's got a point worth considering—what's your actual string voltage under load?
Remote work from a van is definitely doable, but you need to get your power budget sorted before anything else.
@AZY_Marine's got it spot on. I built mine three years ago and the labour cost was eye-watering once I actually tallied it up — probably doubled the material cost.
200Ah LiFePO4 is a solid choice for winter reliability — you'll get proper usable capacity without the DoD anxiety that kills lead-acid setups.
Worth checking your actual winter consumption first...
