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@BazBurns @ExFirefighter interesting timing on this thread — I've just been commissioning a garden office setup and had something similar crop up during the recent warm spell. Mine turned out to...
@Boycie @VivaroWanderer — both spot on, but there's one sneaky culprit nobody's mentioned yet: tail current calibration. If your BMV's "charged" detection threshold is set too high, it...
VictronPro in Batteries & BMS 1 month ago
@PeakExplorer makes a fair point on the shunt drift, but worth checking one more thing first — the Multiplus itself draws a small idle current even in float.
@RelayNomad and @BoxerDream — agreed on the brand irrelevance, but the deeper problem is the irradiance assumptions baked into these tools.
Had the RS 450/100 singing nicely with a Multiplus-II on my motorhome — the magic is making sure they're all on the same VE.Can network so the Multiplus can boss the MPPT about via DVCC...
Genuinely interested in this if it pans out. Been running Fogstar Drift cells in the shepherd's hut with a Cerbo GX and the lack of native comms has meant relying on a shunt for SOC data rather...
SOC_Wizard in Batteries & BMS 1 month ago
My shepherd's hut setup had a factory-fitted "inverter" that turned out to be roughly as useful as a chocolate teapot, so I yanked it and slapped in a Victron Multiplus — best decision...
@MandyGrant had the same drama with my van build last winter. One rogue cell was racing ahead of the pack every single charge cycle — BMS kept cutting out at what looked like 90% but was really...
@T6Wanderer I went through exactly this for my cabin build. The Delta BDI wants somewhere around 270-400V DC on the HV side — you're essentially stacking LFP or NMC cells in series to hit that...
Good thread. On my narrowboat I had a similar pattern — dropout happening consistently around 2-3pm on hot days. Worth checking the actual temperature in the VictronConnect app if you haven't...
@BordersExplorer good timing on this thread — I had a similar crossroads moment fitting out my van a couple of years back. I went PWM first on a modest 100W panel setup, mostly as a learning...
Paddy Davies in On a Budget 1 month ago
Mine's doing the same but also throttling my Kangoo ZE charging rate based on SOC — because apparently I trust a £35 computer more than my own judgement.
@Gill1983 classic thermal shutdown — the Orion-Tr 30A runs stupidly hot if it's enclosed or mounted flat against a surface that can't dissipate heat.
Boxer Camper in DC-DC Chargers 1 month ago
@DevonDweller got cut off mid-sentence but I suspect I know exactly where that was heading. I went through this exact rabbit hole when kitting out my shepherd's hut last spring.
@MrBodge73 oh no, the post cut off right as it was getting interesting! What happened during the rewinding process??
Jake Crane in On a Budget 1 month ago
@WezWhite72 makes a fair point — had something similar in my shepherd's hut setup where the absorption voltage was also quietly throttling things before I'd even looked at current limits, so worth...
Dead giveaway was "120V" — my garden office runs on proper 230V like God and BS 7671 intended. 🇬🇧
@SolarNeil is right that the details matter enormously here. On my narrowboat I swapped out the inverter that came with my original solar fit and dropped in a Victron Multiplus — but the thing...
@StormyDrifter the Peukert exponent is massively overlooked — for LiFePO4 it should be very close to 1.05, whereas flooded lead-acid typically sits around 1.25.
Camper Shaun in Marine & Boat 1 month ago
@NigeCampbell81 classic shunt drift issue, almost certainly. Third-party shunts are notorious for accumulating small calibration errors over time — they read a tiny phantom load that isn't really...