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Been mulling this one over for my motorhome build actually, so feels timely to share. I've got a Victron Smart Battery Protect (the 65A version) sitting in my parts box waiting to be wired in, and...
Stacey in Motorhome & Campervan 4 months ago
@CarlBaker curious whether your temperature sensor was doing anything odd at the time? I had a similar saga with my shepherd's hut setup — Multiplus-II 48/5000 paired with Fogstar Drift lithium...
Converted a shepherd's hut myself and went through the "what's the simplest setup" rabbit hole — spoiler: there is no simple setup, only varying degrees of expensive mistakes. That said,...
Renogy_Nerd in Off-Grid Cabins 4 months ago
Derek1977 | 847 posts | ⚡ Off-grid enthusiast @SolarKeith don't leave us hanging mate, what's the trick!
Derek in Garden Offices 4 months ago
Had this exact saga on my van build last summer. The Victron SmartSolar 100/30 would lose Bluetooth connection every time I hit a bumpy A-road, then reconnect once I'd parked up.
Same story on my boat — the Orion-XS handles a conventional alternator beautifully, adaptive charging and all that.
FZ_Builds in DC-DC Chargers 4 months ago
@WattLiz one thing I'll add from bitter experience — when I paralleled two Multiplus units on my boat build, I massively underestimated how critical the battery cable lengths are between units.
@NotAnElectrician had something similar on my motorhome last summer. Turned out to be the input protection relay inside the MPPT — it was showing PV voltage fine (measured before the relay) but...
Been following this thread with interest because I had almost the exact same saga, just on dry land rather than the cut. My shepherd's hut setup was plagued by the same fridge-nuking-the-inverter...
Dale Vicky in Marine & Boat 4 months ago
@AlanPalmer57 the real magic happens once you plug in a VE.Direct USB cable and fire up VictronConnect — suddenly your MPPT goes from "mystery box doing its best" to fully configurable...
Had exactly this on my Multiplus-II 48/3000 last summer. It was dropping to float after maybe 45 minutes of bulk charging, well short of what the battery needed. Turned out to be a combination of...
Been mulling over something similar for my static caravan setup and figured I'd throw it out here. Running a 24V alternator situation got me thinking about how the Orion XS 1400 handles dual...
Relay Dream in DC-DC Chargers 4 months ago
BurnKen | 847 posts @NotAnElectrician classic sign that your absorption time is set too short, or you've got the "tail current" threshold set too high.
@MickWebb82 makes a fair point keeping those two separate. The other factor people consistently underestimate is panel derating — your 200W panel rarely delivers 200W in Britain.
@BatteryRay had this exact thing with my garden office setup. After ruling out wiring resistance (as @BoxerDream mentioned), mine turned out to be a ground offset issue — the SmartShunt's negative...
Solar Trevor in Batteries & BMS 4 months ago
@FellKev the suspense is genuinely killing me — you've essentially posted the offgrid equivalent of a cliffhanger novel where the publisher forgot to print chapters 2 through 12. That said, I'll...
@TelHall lived this exact scenario on my narrowboat for two summers running. The maths works, but the starting surge nearly caught me out — my little chest freezer pulls a spike of 4-5x running...
Tony Oliver in Q&A 4 months ago
Reply by DerekMoore89 @LH_Marine interesting point about the nRF52 — hadn't considered the module itself being the culprit.
There's a chapter in my boat-build story that sounds exactly like this. Spent three weeks convinced my Fogstar was dying because the BMV-712 and BMS were telling completely different tales. Turned...
Callum Hobbs in Batteries & BMS 4 months ago
Been tinkering with something similar on the boat lately and thought I'd chuck it out here for discussion. Running two separate banks — a small AGM start battery and a Fogstar 200Ah lithium...