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Ran into exactly this with my motorhome build last year. The non-NG Lynx BMS has a tail current threshold alongside the charged voltage detection @OldSailor mentioned — both conditions need to be...
Ran 6mm thick busbar on the narrowboat last year and honestly the only thing that got warm was my wallet after buying the crimping tool I apparently "needed."
RetiredChef | 1,204 posts | Battery Whisperer 🔋 Classic case of the BMS lying through its teeth while the Multiplus catches the actual problem — had this exact nightmare on my static caravan setup...
@Titch covered the VE.Smart Networking side nicely — worth adding though that if you want proper historical logging and a single dashboard, connecting both MPPTs to a Cerbo GX (or even a cheaper...
@BevJackson64 on most Bluetooth BMS units you're getting individual cell voltages, temps, current draw, SoC estimate, and cycle count.
Relay Dream in Batteries & BMS 4 months ago
@WattAMess25 the Quattro's AC-in-2 is deliberately hobbled — it's passthrough only, no inverter support, so if your generator drops out you won't get that seamless UPS-style switchover you'd get...
Marine Geoff in Batteries & BMS 4 months ago
@EmmaEdwards82 @FenlandVanLifer the real question is whether that Bluetooth app is actually useful or just another icon gathering dust on your phone next to the one for your smart kettle — my...
NaeClue in Batteries & BMS 4 months ago
ThingamyBob | 203 posts This is really useful — I've been scratching my head about something similar on my narrowboat setup.
ThingamyBob in DC-DC Chargers 4 months ago
@FZ_Builds the 80A headroom approach is exactly how my Victron MultiPlus survives British winters without nuking the wiring every time the heating kicks on simultaneously — margin isn't paranoia,...
Really interesting thread this. @Jock do you know if the V2 has proper CANbus/RS485 comms that'll talk nicely with a Victron Cerbo GX?
Cleggy in Batteries & BMS 4 months ago
Ran Venus OS Large on a Pi 3B+ for the garden office for about six months until I accidentally sat on it during a particularly ambitious cable-routing session — now running a Pi 4 4GB and honestly...
@EcoFlow_Queen the non-NG Lynx BMS uses a charged voltage detection threshold internally — if your Fogstar Drift cells hit absorption voltage but the BMS doesn't see the tail current drop below...
@Fogstar_Fan had the same ghost EVCS sitting on my VRM for weeks during my van build. What actually cleared it for me was SSHing into the Cerbo and manually deleting the device instance from...
ThingamyBob62 in Batteries & BMS 4 months ago
@ZFS_OffGrid that's really helpful — so just to confirm I'm understanding this correctly for my narrowboat setup, does everything need to route through that shunt negative?
@SophieFisher Been there with my motorhome build! One thing that really helped me was downloading the Victron wiring unlimited PDF before touching anything — it maps out exactly which devices...
Watt Liz in Inverters & Chargers 4 months ago
@QJ_Builds 8 months is almost impressively consistent for a failure point — like the unit had a calendar and a grudge. One thing worth checking that nobody's mentioned: the input voltage threshold...
@SmartSolar_Master — been doing something similar in my van build but went a slightly different route.
@MrBodge65 is absolutely right on mounting location. Mine lives in the offside locker of the motorhome, bolted directly to the steel bulkhead with M5 cap screws and a thin smear of thermal paste...
Still running a Pi 3B+ here with Venus OS and it's been solid for nearly 3 years. Wouldn't swap it out unless it died tbh. One thing worth adding — the VRM portal integration is the real win for...
BlownFuse | 312 posts | Off-Grid Tinkerer @Jess1989 Worth checking whether your BMS has a separate communications cable to the Multiplus or if it's just relying on voltage-based protection.