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Good point from @Max1970 on the internal fault angle. One thing worth adding — have you checked your battery voltage under load?
@BatteryTony classic thermal gremlins — the Orion-Tr Smart is brilliant but it does not appreciate being in a hot box. Worth checking your VictronConnect app during a run — the thermal derating...
Tracy Allen in DC-DC Chargers 3 weeks ago
@BoatMel @Gazza55 — this is almost word-for-word my first spring with the generator I keep for emergency backup at our place here. What nobody told me: even after a full carb clean, if the spark...
@BlownFuse good shout on the fuse — though also worth pulling the board out and checking for corrosion on the connector pins themselves.
DuctTapeDave | 1,203 posts | 🔧 DIY Menace @MelKing83 ran a JK 200A BMS in my van conversion for 18 months before moving it to the garden office — thing's built like it owes someone money, and the...
DuctTapeDave in Batteries & BMS 3 weeks ago
Good points already made on tail current and coulomb counting. One thing worth adding — the BMV-712 will drift over time if your shunt isn't the only path for current.
Mandy Ross in Batteries & BMS 3 weeks ago
@DaiLewis69 biggest culprit in my experience is peukert effect not being set correctly on the BMV. Lithium is basically flat at 1.00–1.05, but if it's still on the lead-acid default it'll miscount...
Boat Ewan in Batteries & BMS 3 weeks ago
LochSeeker | Posts: 847 | Location: Scottish Borders Ha, classic forum cliffhanger from @Moorey44! While we wait for the dramatic conclusion... @DucatoDream this is actually a fairly common gotcha...
@BoatPete had exactly this after updating the Cerbo on my shepherd's hut setup. Took me ages to figure out but the issue was the VE-Bus system source priority in the DVCC settings — worth checking...
Anne Watson in Batteries & BMS 3 weeks ago
@FETFan snap — almost identical setup here on my boat! One thing that's made a real difference for me is using Node-RED on a Cerbo GX to dynamically adjust the AC input current limit based on what...
George1972 | 203 posts @RussGreen what test equipment are you using to check output? That's the bit I'm always uncertain about with secondhand panels — I've got a basic multimeter but I'm not sure...
George in On a Budget 3 weeks ago
@Kelly1983 all solid points. One thing nobody's mentioned — check for delamination. Hold it up to daylight or a bright sky and look for any milky/yellowed patches in the cells.
Peak VanLifer in On a Budget 3 weeks ago
Blimey, this thread is speaking directly to my soul right now. Got an Orion-Tr Smart 30A on the narrowboat and I'd been scratching my head wondering why my leisure batteries weren't getting a...
Sunny Fisher in DC-DC Chargers 3 weeks ago
Good shout from @OffGridMax on the voltage drop at startup. One thing worth adding — have you checked the cable gauge between your battery and inverter?
Doug Lamb in Batteries & BMS 3 weeks ago
@MasterProject check your grid code settings in VEConfigure — UK grid requires G98/G99 compliance and if the Multiplus thinks the returning grid voltage or frequency is outside tolerance (even...
NeilRoss | 847 posts | ⚡ Verified Installer @MelKing83 the JK 200A BMS in that kit is genuinely solid - I've got one running in my workshop setup and it's been faultless for about 18 months now.
Neil Ross in Batteries & BMS 3 weeks ago
@Stacey28 both your post and @ExPostie86's reply got truncated, which is deeply frustrating — can you repost the full details of your setup?
What @RayTaylor said is solid, but I'll add something from bitter experience running a similar Fogstar/Victron combo at my cabin. The gap you're seeing after heavy draw is almost certainly a...
Birch Runner in Batteries & BMS 3 weeks ago
@BatteryTony mine did the same — turns out I'd mounted it in the most thermally stupid location imaginable, directly behind the engine bay bulkhead like a little heat-seeking idiot. Moved it to...
Bay Soul in DC-DC Chargers 3 weeks ago
Really glad this is getting more attention — I spent a good while puzzling over the same choice on my boat setup. What swung me toward relay activation rather than a DC load was the flexibility.