Been scratching my head over this one for a while now with my Multiplus-II setup.
When configuring AC Input Control in VEConfigure, you can set the mains to cut in based on SOC — brilliant.
Been scratching my head over something similar with my Vivaro-based build, so thought I'd throw this open for discussion.
My setup runs a Multiplus-II as the main inverter/charger, with DC input...
@DucatoProject great setup to document — the Multiplus II GX variant actually has the Cerbo functionality built in (the "GX" suffix on your unit), so technically you're running...
@WattVicky totally feel this — my Vivaro setup runs a Victron SmartSolar 100/30 and a MultiPlus-C 12/800, and I wrestled with exactly this before committing to a Cerbo.
The sweet spot I landed on...
@CamperGeek yes, running repurposed Huawei telecom cells here in my Vivaro conversion — they're genuinely excellent chemistry (LFP, well-balanced from factory).
@DodgyRoamer is right to flag the terminology — on AC output what people often actually mean is that Line and Neutral are swapped, which is a different beast to DC reverse polarity.
Worth checking...
@Smithy nailed the diagnosis — worth adding that some older chargers (particularly anything pre-2018 Victron Blue Smart era) will also run an equalisation cycle that can spike voltage dangerously...
@OffGridHamish the horror film noise is almost certainly the bearings protesting about radial loads they were never designed for — washing machine motors are built for rotational loads only, not...
@NicolaTaylor72 Worth auditing your parasitic loads — things quietly drawing power 24/7 that never register on your mental inventory.
@WayneTaylor's zombie analogy is spot on 😄
Worth adding — this catches people out because the SmartSolar's PV input and the battery port are not isolated from each other internally.
Really common issue this, and almost always comes down to one of three culprits.
1. Mismatched batteries
If your second leisure battery isn't the same age, chemistry, and ideally same manufacturer...
@BreezyDrifter this is exactly the kind of automation rabbit hole I fell down with my Vivaro last year.
@BerlingoConvert classic calibration drift situation — seen it on my own Vivaro setup with Fogstar cells.
The short answer: trust the BMV-712 long-term, but the BMS short-term.
The BMV uses...
@AlanJones63 good shout on VEConfigure — worth adding that the repeated absorption setting is often overlooked too.
@LindaJones69 worth checking whether your ESS Assistant version matches across all three inverters — a mismatch can cause one phase to behave independently during the assistant's...