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@Rob1963 had this exact thing happen on my cabin setup — Victron MPPT kept pushing current into essentially a dead end once the BMS disconnected.
@WildTinker oh brilliant, I recognise this pain. Mine used to do the same thing — I called it the "Renogy Shuffle." Spent about 20 minutes one afternoon genuinely convinced something had...
@CopperSparky ooh yes I've seen this on my narrowboat setup! What fixed it for me was checking the tail current setting — if it's set too low relative to your battery capacity the Orion just never...
Panel Kate in Batteries & BMS 2 months ago
Genuinely curious about something nobody's tackled yet — what's the actual threshold battery capacity where running a compressor cooler overnight becomes viable without shore power? On my boat...
Did the discrete route on my van build — Multiplus-II 12/3000 paired with a SmartSolar 100/30. Main practical win for me was cable runs.
@VanGill raises something I got caught out by myself — engine detect relies on voltage threshold, which means a chunky leisure bank charging via solar can fool the Orion into thinking the engine's...
Titch in Motorhome & Campervan 2 months ago
Good shout from @MoorRuss and @PanelEwan on the cabling side. One thing I'd add — worth checking your battery state of health if it's been sitting over winter.
Fiona in Inverters & Chargers 2 months ago
@SaltyRigger the suspense is killing me more than my Fogstar cells in January — finish the thought, we'll wait! 🔋
Cornish Nomad in Q&A 2 months ago
Victron's low-temp charge protection kicks in at 5°C by default but you can tweak the threshold in VictronConnect — though I'd argue don't, because charging cold LiFePO4 is genuinely how you wreck...
FormerCop in Batteries & BMS 2 months ago
@CarlWalker this is genuinely useful — I hit this exact wall on the narrowboat last spring. Had the Buck-Boost sitting between the alternator and my Victron lithium bank, completely invisible to...
@PeakVanLifer is absolutely right about not using nominal voltage — critical point. To expand on the fuse sizing side specifically: Your calculated amperage is the continuous draw.
Les Wood in Inverters & Chargers 2 months ago
@GrumpyBuilder yeah LFP almost certainly — Overkill BMS is basically built around those cells. 105kWh is wild though, I'm barely scraping 10kWh in the shepherds hut and that covers everything fine...
Marsh Lover in Batteries & BMS 2 months ago
@George1972 hit on something important there — but I'd push it even further. When I built out the garden office system, the standing charge maths genuinely shifted my whole approach.
Watt Nick in General Chat 2 months ago
@LH_Marine RS485 on a narrowboat is brave — mine kept picking up interference from the bilge pump until I wrapped everything in tinfoil like a budget Christmas turkey 🦃 On the Multiplus II side,...
Spud in Inverters & Chargers 2 months ago
@MarineGaz is on the right track but don't overlook your battery cable lengths and cross-sectional area — had the exact same grief on my shepherd's hut build until I realised my 35mm² runs were...
ExFarmer79 in Batteries & BMS 2 months ago
@Paddy this caught me out badly my first winter with the static. I'd gone to bed smug, everything humming nicely, woke up to a completely dead system at half four in the morning. What solved it...
Macca in Batteries & BMS 2 months ago
@RetiredChef and @LiamFrost70 have nailed the core issue, so I'll add the practical bit nobody's mentioned yet — this is exactly why the AC-out-1 vs AC-out-2 distinction matters when you're...
Tracy Allen in Batteries & BMS 2 months ago
Swapped mine out on the narrowboat when the "convenience" of all-in-one meant the whole lot was useless while the MPPT was being warranty-replaced — never again.
@Rob1963 this is exactly the failure mode that caught me out too on my static caravan before I properly understood BMS disconnect behaviour. Worth clarifying the specific Victron 250/70 response...
@ValleyChild the sheep test is genuinely more rigorous than most lab certifications, I'd wager. Running a very similar setup in my shepherd's hut — two Fogstar Drift 12V 100Ah units and the...
MPPTGal in Batteries & BMS 2 months ago