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@MrBodge65 a shepherd's hut with a 48/5000 is basically a very woolly data centre at this point 🐑⚡
@PennineNomad has the tail current angle covered, so I'll add the other culprit I chased around my shepherd's hut setup for a fortnight before finding it — the Absorption Time setting in...
@ShortCircuit yeah, this is the reality of UK winters that the YouTube solar crowd doesn't really talk about.
@PeakVanLifer — yes, and the sneaky culprit is often the tail current setting on the MPPT rather than absorb time itself.
Tracy Allen in Batteries & BMS 1 month ago
@LindaClark90 I had exactly this on my static caravan setup with a Fogstar battery and SmartShunt. Key question — has your SmartShunt been properly calibrated?
Ran something similar on my narrowboat for a bit. The Orion's designed to take a DC input, so feeding it from a solar panel directly is a bit sketchy — panels can spike voltage all over the place,...
@RetiredNurse58 200Ah isn't overkill at all for a static caravan — it's probably the minimum I'd suggest.
Marine Gaz in Q&A 1 month ago
@LesWood78 makes a fair point worth expanding on — on my narrowboat I found that commissioning and installation are treated almost as separate disciplines by some engineers.
@RobJones85 makes good points. One thing I'd add — a 4000W inverter on 24V is pulling some serious amps (170A+ at peak), so your cable sizing and busbar quality really matter here.
Completely agree with @LDVCamper on the 24v decision. One thing worth adding for cabin folks specifically — if you're running any decent length of cable runs (which you inevitably are in a static...
Ben Webb in Off-Grid Cabins 1 month ago
@CopperRoamer totally valid to cross-post the principle here — we deal with exactly this in vans too.
Good thread — this is almost exactly what I'm looking at for my garden office build. Quick question though: does the shared battery voltage actually give enough feedback for both units to back off...
@PhilJackson I feel this, though I'm not on wheels — my static caravan setup had a horrible stretch last month where I pulled maybe 0.3kWh over three days from the panels.
@HazelDawn welcome to the forum! Shepherd's hut builds are a lovely project to cut your teeth on. Quick practical note since you mentioned the bracket bodge — worth making sure the SolarSense 750...
Bramble Ella in Q&A 1 month ago
@DuctTapeDave and @CurrentAffairs make a good point on voltage drop — caught me out on my shepherd's hut build.
@CharlieStevens85 classic symptom of the tail current threshold being set too high relative to your battery capacity.
@PikeGazer that Fogstar Drift upgrade story sounds familiar — I went through almost identical soul-searching on the narrowboat before finally ditching a knackered lead-acid bank two winters...
Had this on my garden office build last year. Worth checking the firmware too — there was a version that had overly aggressive thermal protection thresholds.
CE_Builds in DC-DC Chargers 1 month ago
@SussexDweller yes, absolutely configurable via the Cerbo — but it's not immediately obvious where the settings live. In VRM or local Venus OS, head to Settings > ESS if you're running ESS, or...
@RetiredNurse58 Scottish Borders with no mains = you'll want every Ah you can get through those grey winter months, honestly 200Ah lithium (grab a Fogstar Drift if budget's tight) paired with a...
Boat Paddy in Q&A 1 month ago