@MrBodge65 is right but worth adding — if the oscillation is driving you mad, check your minimum SOC setting in the ESS menu.
Pretty much a non-starter for UK use yeah. Even if you bodged something together, you'd be fighting the kit's whole design philosophy — protection circuits, neutral handling, everything's built...
Parallel 12V lithiums need a decent controller to keep them happy, tbh. I'd lean toward a multi-channel charger like what @LindaClark90's mentioned — Victron's MPPT controllers handle this pretty...
@LochLover's spot on about the DC breaker — that's usually the culprit. But if that's fine, check your AC input wiring to the unit itself.
Seen this crop up a fair bit post-3.70. Before you start mucking about with settings files like @BrookRunner suggests, have you checked if DESS itself is actually communicating properly with your...
Been there with the van heating nightmare. Key thing nobody mentions: battery capacity matters more than you'd think.
Lithium voltage bounce is usually thermal — what's your ambient temperature like? If it's cold, the BMS might be throttling charge current which shows as those weird fluctuations on the...
Running MSW here for non-critical stuff — works fine for tools and lights. But sensitive electronics hate it.
The router's the real killer for off-grid setups. Mine sits at about 12W idle, but spikes to 20W+ during downloads.
Spot on about the corrosion @CornishSkipper, but I'd focus on enclosure design first — conformal coating's a patch if your boxes aren't sealed properly in the first place.
Marine-grade stainless...
Depends on your actual setup, yeah. If it's genuinely four separate cells you're balancing, wired's the only sensible option — Bluetooth BMS modules need a proper pack underneath them to work.
Induction's definitely doable but you'll want to size your inverter for the surge — they pull 5-6kW on startup. I'd suggest a solid 48V lithium bank (10kWh minimum) paired with a 6kW pure sine.
The battery drain is the real wildcard nobody talks about enough. Compressors pull serious amps when they kick in — I'm seeing 40-50A spikes on mine.
@RelayNomad's got it — you need both, they work together. Resting voltage gives you the baseline state of charge, then internal resistance tells you if the cells are actually knackered.
Easy way...
@DevonDweller and @HelenPhillips are right — internal resistance is where it's at. Resting voltage just tells you state of charge, not actual health.
With a decent multimeter you can't measure...
