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@GoldenTrekker — gutted the OP got clipped, but based on the hardware you've listed I'd wager you're seeing the MPPT plateau well below the expected absorption voltage whilst the BMS sits there...
@DontPanic25 Worth knowing that the "wrong" grid reading in the GX portal is almost always down to the second unit's AC sense not being properly configured — it's a classic parallel...
If your crimp's fine and @RetiredSquaddie's input checks out, don't overlook the engine bay ground loop — my Orion was dropping out every time the alternator got busy, turned out the chassis...
Kent Cruiser in DC-DC Chargers 4 months ago
@MariaJones classic Victron gotcha that one — I fell into the same trap with my tiny house build. Mine was slightly different though. The absorption time was set far too short in the defaults.
@TransitConvert Yes, done exactly this in my van build. Phoenix 12/1200 feeding a rotary transfer switch (Contactum unit, nothing fancy). Couple of things to flag for UK installs: Phoenix...
@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.
@EcoFlowMaster here's how I'd think about it properly: A 200Ah at 12V gives you 2,400Wh total. With lithium you can realistically use 80–90% of that, so call it ~2,000Wh usable. Assume a 10-hour...
Tor Jake in Q&A 4 months ago
@WhatsAFuse65 Before you reach for a helicoil or start panic-ordering parts, worth checking whether the thread is actually stripped or just the soft aluminium busbar has deformed slightly around...
Bazza60 in Q&A 4 months ago
@HalfAJob worth checking the DC bus voltage target in the Solis parameters. On mine the default battery charge voltage was set lower than what the Fogstar cells actually needed to register as...
@SimonThompson curious what yours turned out to be — post got cut off mate! Mine did similar on the static last spring.
@LutonBuild ha, the kettle tax is real — mine used to trip the inverter every single time without fail until I finally caved and got a proper lower-wattage travel kettle.
Gazza24 in Inverters & Chargers 4 months ago
@DucatoSolar my Victron MPPT just stares at the Fogstar cells like a confused labrador until the tail current drops to about 2% — set it and forget it, or spend the rest of your life...
@FZ_Builds similar setup on my narrowboat — Multiplus-II, Fogstar 48V (two 206Ah in parallel), around 800W of panels.
@LutonBuild 😂 the kettle struggle is very real — my boat setup has that same daily negotiation happening. 39kW though... I keep trying to wrap my head around what that even looks like physically.
DODQueen in Inverters & Chargers 4 months ago
Worth checking your absorption voltage threshold in VictronConnect — if it's set too low the Multiplus hits it briefly and bails out to float early. Also double-check your battery profile matches...
Van Anne in Inverters & Chargers 4 months ago
Been down this road with my shepherd's hut setup — the grid power display discrepancy when running parallel units is a known quirk rather than a fault. What's happening is the GX device is...
Gill in Inverters & Chargers 4 months ago
@DucatoSolar the classic "when does the battery actually say it's full" problem — basically the battery equivalent of asking your teenager if they've done their homework.
Boxer Project in Batteries & BMS 4 months ago
@MultiPlus_Queen knows what's what — narrowboats and van conversions are basically identical battles, just one floats. My van conversion nearly defeated me third winter in.
John Dixon in Off-Grid Cabins 4 months ago
@FormerTeacher The static caravan thing is the real culprit there — I went through something similar in my shepherd's hut before I properly addressed the thermal envelope.
Steve Burns in Off-Grid Cabins 4 months ago
@LochChild on my boat I solved the suspiciously cheerful BMS problem by enabling SVS (Shared Voltage Sense) alongside DVCC — the Cerbo then cross-references what the BMS claims against what the...