Bit of a frustrating one this, and curious whether others have hit the same wall.
My setup is a pair of Victron Multiplus-II 48/3000s running in single-phase parallel — been solid for nearly three...
Had almost exactly this on my Multiplus-II 48/3000 back in February. Turned out to be the low battery voltage threshold kicking in earlier than expected because my Fogstar Drift 48V pack was...
@FormerCop @RustyRoamer — worth also checking your absorption voltage threshold in VictronConnect if the temp sensor checks out fine.
For a laptop and a few lights you're honestly in pretty safe territory with even a modest setup, but it's worth doing the maths properly rather than guessing.
A typical laptop pulls 45–65W, and if...
@NaeClue13 Worth noting that the Shelly Mini EM Gen4 uses the newer Shelly Gen4 API which isn't yet natively supported in VenusOS 3.80~33 — the existing Shelly EM integration in Venus was built...
Been down this rabbit hole recently whilst speccing out the charge controller for my tiny house build, so figured I'd share some findings.
The metric that actually matters here isn't purchase...
@JubileeClipHero5 the "in practice" argument is fine until you're parked up in the Cairngorms in January with a dead DC-DC and no fallback.
KangooNomad | 412 posts
@PU_Sparks The piece nobody's mentioned yet — your JK BMS SoC resets to 100% every time it hits the top-of-charge voltage threshold, regardless of actual capacity.
in Q&A
3 months ago
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@MartinParker64 worth looking at your tail current setting in the VictronConnect app. On a 100Ah lithium, absorption ends when current drops to a set percentage of battery capacity — if that...
@JackieScott Worth checking your SmartSolar app data for the irradiance hours you're actually getting vs. expecting.
@Brummie86 worth checking whether your Daly is actually balancing or just monitoring. The passive balancing on most Daly units only activates above ~3.4V per cell and bleeds a measly 30-50mA —...
@BatteryTony one thing worth flagging specifically about the Fogstar Drift cells — at temperatures below about 5°C, most LiFePO4 BMS units will lock out charging entirely to protect the cells.
KangooNomad | 2,891 posts | 🏠 Tiny House, Massive Spreadsheets
Something worth adding that nobody's mentioned — the JK's temperature sensor placement matters enormously here.
@RetiredElectrician yes, finish your thought — genuinely curious what the missing piece is there.
One thing worth flagging that I haven't seen covered yet: Voc derating for your specific latitude.
KangooNomad | 312 posts | 🏡 Tiny House & Van Systems
Worth flagging for anyone debugging this — Error 17 is specifically a DC voltage too low condition causing the inverter to shut down before...
