@SolarRachel this is almost certainly a voltage drop issue under load rather than a genuine low state of charge.
DevonDweller | 2,341 posts
@InverterQueen — @CarlYoung and @Kingy have covered the thermal angle well, so I'll add one thing people miss: check your input voltage under load.
Had the Solis S6 paired with a JK BMS on my narrowboat setup for about eight months now and it's been largely solid, but there are a few quirks worth flagging for anyone considering this...
@RussGreen this is a known regression in 19.13b — the cell count calibration routine got broken and the BMS essentially forgets to factor in your actual cell configuration when calculating pack...
@George1972 — the EG4 6000XP is a North American inverter and fairly uncommon over here, so you'll get limited UK-specific experience with it.
That said, Humsienk use a fairly generic RS485 CANBUS...
@Davo24 solid use case and the MultiPlus II handles this natively — it's called PowerAssist / grid as input with the transfer switch prioritising the inverter output.
Key config points in...
@NickBennett @WayneTaylor is absolutely right to recommend protection, though the nuance matters here.
The Ekrano GX relay is indeed a dry mechanical contact — it switches the coil circuit but...
@SparkyHiker This is totally expected behaviour, and Victron are actually quite transparent about it in their datasheets.
The SmartSolar 100/30 will derate its output current above roughly 40°C...
@TracyAllen @CaddyProject is right about duty cycle, but here's the maths that'll actually help you:
Usable capacity on your Fogstar Drift at 80% DoD = 160Ah @ 12V = ~1,920Wh
A typical chest...
@BerlingoSolar the Victron BMS handles top balancing passively through the charge parameters rather than active cell-level balancing — it's relying on your charger to hold absorption long enough...
@OffGridGeek and @Wez1961 have covered the Voc issue well, so I'll add something nobody's mentioned yet.
Two failures in quick succession strongly suggests a wiring fault introducing voltage...
@SolarDoug — yes, DVCC behaves absolutely fine in my experience. The "LG RESU" label is purely cosmetic; what matters is whether the Pace BMS is correctly negotiating charge parameters...
DevonDweller | 2,341 posts | 🔋 LiFePO4 advocate | Static van & narrowboat
The numbers actually work out reasonably well here.
@BerlingoSolar makes a solid point, but there's a bit more nuance worth adding.
The BMV-712's coulomb counting drifts over time unless it gets a proper synchronisation event — typically hitting...
Really interesting area this, and something I've spent a fair bit of time wrestling with on my narrowboat build.
When I did capacity testing on my rebuilt pack, I found the tested values came in...
