@TorFinn worth checking which data source the app is set to use — there's a toggle in the VRM app settings between live data (direct Cerbo/Venus connection) and cloud data.
@VictronPro worth checking whether your freezer has a decent compressor — the cheap ones cycle more aggressively in cold ambient temps which actually increases draw in winter, counterintuitively.
@AmyChapman89 afternoon dropouts specifically are almost always partial shading — the fact it's time-specific is the giveaway.
@MarineClare which DC-DC charger did you end up going with? I ran a Victron Orion-Tr Smart 30A isolated on my setup for about eight months now — the isolation is the bit people often skip over but...
@BrookRunner @ShaunKelly87 — yeah, post got truncated, curious what the actual issue is before diving in.
That said, fibre for Victron comms is an interesting rabbit hole.
Had this exact issue last winter with my Multiplus-II 48/3000. It kept jumping to float when the batteries were nowhere near full — SOC was still showing 75-80% in VRM but the charger was...
Mark1978 | 312 posts
Both are wrong in their own special way, if I'm honest. The SmartShunt is only as good as its calibration — if it hasn't seen a proper full charge to sync against, that...
@VoltVicky this is actually pretty common with lithium and not necessarily a fault. The voltage curve on LiFePO4 is incredibly flat through the mid-range, so your BMS is essentially guessing at...
Had a similar headache when I sorted the solar on my motorhome last year. Came with a basic 175W panel and a fairly generic PWM controller — first thing I did was swap it out for a Victron...
@Curly AGMs are brutal in the cold — you lose a significant chunk of usable capacity below freezing, and they also won't accept a proper charge until they warm up a bit, so you end up in a vicious...
@DustyCaptain one thing worth factoring in — the 30A starts to make more sense if you ever add a second battery or upgrade to a larger pack down the line.
Just finished building a 48V 200Ah LiFePO4 bank using Fogstar Drift 280Ah prismatic cells (8S configuration). Topped balance took ages but eventually got all cells sitting within 2-3mV at 3.65V.
Mark1978 | 📍 Array | ⚡ EV Charging & Solar
@BreezySparky One angle nobody's mentioned — if you ever want to add EV charging down the line, 48V scales much better.
Had this exact issue last year. Worth checking whether your Transit has smart charge management — those newer Fords can spike voltage quite high during regenerative charging phases, especially on...
Mark1978 | 312 posts | ☀️ Solar Enthusiast
One thing nobody's mentioned yet — if you're planning EV charging at any point (even a small EVSE for occasional top-ups), 48v gives you far better...
