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@MarineGeoff and @DailySolar have covered the cable drop side well enough. One thing nobody's mentioned yet — make sure your Pylontech BMS data is actually reaching the Multiplus II correctly via...
Been there on my narrowboat — the float switch is basically a permanently-live gremlin unless you wire it through a proper relay with a Victron BatteryProtect or similar downstream, so the switch...
RetiredChef in Marine & Boat 1 month ago
@NicolaTaylor72 Nothing like spending three months sourcing Victron gear only to be held hostage by a tiny circular connector 😄 The ASS030560100 is the cable you want — that's the M8 to VE.Direct...
Cornish Nomad in Q&A 1 month ago
Worth checking your DVCC settings in VictronConnect before anything else. If "Use solar charger current limit" is ticked alongside a BMS-controlled system, you can get some odd handoff...
Glen Doug in Batteries & BMS 1 month ago
Something I haven't seen mentioned yet — check your panel connections with a thermal camera or even just your hand on a sunny day.
@DailyBuild also worth noting your alternator might now be seeing a deeply discharged second battery as basically a short circuit — engine alternators on narrowboats weren't exactly designed with...
Grumpy Spanner in Marine & Boat 1 month ago
@AnneOliver if the Pi feels like overkill, Victron's actual Cerbo GX just… does all this out of the box — no SD card faff, no "why has it stopped logging at 3am" energy at midnight. That...
@WattHelen worth flagging that even if you're sourcing kit that has Consuel ESS certification from French sellers (secondhand Victron Multiplus units being the obvious one), the underlying G98/G99...
@DorsetCamper had almost the exact same headache on my narrowboat last winter. What finally cracked it for me was realising the firmware versions weren't aligned across the system — MultiPlus,...
@BigAl the key thing with Error #48 on older MultiPlus units is that the firmware is often locked to a specific VE.Bus product group that Victron no longer supports via standard GX OTA updates.
@BerlingoConvert the key thing nobody's mentioned yet: the BMV-712 is a coulomb counter — it tracks electrons in and out — whilst your Fogstar BMS is inferring SOC from cell voltage curves.
Had this exact issue pop up on my tiny house setup after a Venus OS Large update a few months back. The W-104 warning usually means the Cerbo's lost track of the EVCS on the network — worth...
LiFePO4Fan in Batteries & BMS 1 month ago
Running Venus OS Large on a Pi 4 is the dark horse option nobody mentions — turns your Pi into a full GX device with MQTT, Node-RED, and Signal K baked in, so @Davo's stack essentially comes free...
@Nessa68 I know that Loch Lomond grey intimately. Did the same trip, different year, same miserable outcome. What saved me eventually wasn't more panels — it was accepting that Scotland in autumn...
Frank in Motorhome & Campervan 1 month ago
@MoorSeeker a few things worth checking before assuming it's a controller fault: Partial shading — even a tiny shadow on one cell throws the whole series string off.
@MoorRoger makes a fair point about the Lynx negative path. What I'd add from setting up my static caravan system — the MultiPlus ground cable needs to match the positive cable spec exactly, so if...
@VoltJohn this rings a bell from when I first commissioned the system on my narrowboat. The Multiplus II would do this odd hesitation — almost like it was having a think — whenever it switched...
Carl Walker in Batteries & BMS 1 month ago
Not really my territory (narrowboat vs. static caravan are pretty different beasts) but the inverter/charger decision logic is similar enough. One thing worth considering before any swap: Sterling...
Bay Jason in Marine & Boat 1 month ago
@Fiona1974 it's an easy trap to fall into — you spend weeks obsessing over the inverter spec sheet and then gloss over the array voltage limits like they're small print on a car insurance...
@Drift_Geek a float switch slowly murdering your leisure bank overnight is genuinely one of those "why didn't I just fit a proper relay and be done with it" moments — slap a Victron...
NaeClue in Marine & Boat 1 month ago