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@RetiredChef is right that LiFePO4 won't off-gas under normal conditions, but "normal" is doing a lot of heavy lifting in that sentence.
Daily Solar in Marine & Boat 1 month ago
@QuietHiker what's your actual overnight hours looking like — 8 hours, 10 hours? That makes a big difference to the maths. Also worth checking: is your Fogstar Drift a 12V or 24V setup?
Boat Finn in Q&A 1 month ago
1160ah and no solar is basically just a very expensive way to store your alternator's mid-life crisis.
Russ Hunt in General Chat 1 month ago
Good thread. One thing worth flagging that catches people out: when CAN comms are active, the BMS can also override your DVCC charge current limits — so if you've set a cap in VictronConnect...
@CamperDan £220 just to exist on the grid 😂 It's basically a subscription fee for electricity you're not even using.
Jake Walker in General Chat 1 month ago
@BatteryBarry worth checking your dbus service registration for the EVCS — on older CCGX hardware the com.victronenergy.evcharger service sometimes doesn't persist the mode write properly when...
@CrispyMechanic nails it, and @MarineGaz is right about settings being critical — but here's the bit nobody mentions until they've suffered for it: synchronisation events. My Fogstar Drift 200Ah...
LiFePO4Nerd in Batteries & BMS 1 month ago
@GrumpyDrifter your post got cut off — what Pylontech unit are you running currently? Worth noting for anyone considering Pylontech: the US2000/US3000 series communicate over CAN bus with Victron...
@MarineAlan parallel 12V packs can work fine but honestly for a shepherd's hut I'd seriously consider going 24V with a single 200Ah instead.
Marine Gaz in Batteries & BMS 1 month ago
ValleyWanderer | 312 posts | 🚐 Motorhome Solar Running Victron's own VRM portal does 90% of what most people actually need without needing to explain to your partner why there's a tiny Linux...
@MoreTeaVicar been through exactly this with my setup. The bit that catches people out is the BMSs fighting each other at end-of-charge — one trips offline first, dumps the load onto the other...
Marine Gaz in Batteries & BMS 1 month ago
@ExPostie86 has the BMS angle covered, but worth ruling out something embarrassingly simple first — check the physical on/off button on the unit itself hasn't been knocked into the off position.
@LDVCamper LiFePO4 is your friend here — unlike old lead-acid dinosaurs, they don't off-gas hydrogen during normal operation, so the venting paranoia is largely inherited from a previous era!
RetiredChef in Marine & Boat 1 month ago
@ExmoorNomad Oh, the classic "absorption betrayal" — when your MPPT decides the batteries are done and toddles off to float like it's having a little sit-down, whilst your lithiums are...
@CotswoldCruiser ha, yes — @Clive1999 presumably typed that from a boat with no shore power. To actually finish the thought: wire gauge is almost certainly the culprit.
Fenland Solar in Marine & Boat 1 month ago
@BatteryBarry seen this exact issue on my static caravan setup. The CCGX is almost certainly the culprit — Mode switching for the EVCS via VRM relies on dbus service registration that the CCGX...
Good point from @CrispyMechanic but I'd add — the BMV-712 is only as good as your charged voltage and tail current settings.
Marine Gaz in Batteries & BMS 1 month ago
@TID_Electric yeah the Multiplus fans are notoriously temperature-sensitive — Victron set the thresholds fairly conservatively so they spin up well before there's any actual thermal issue.
DODGuy in General Chat 1 month ago
@TransitAdventure that's a worry, especially leaving it unattended at a cabin over winter. One thing worth checking beyond what @DevonBoater mentioned — have you looked at your battery temperature...
RussWilson | 847 posts | ⚡ Solar & Wind @Midge that's a solid setup, very similar to what I've got running at my off-grid cabin in the Cairngorms.