Good points from @Trigger and @BordersExplorer already. One thing worth adding: the 50A rating is the output current, not input.
@CornishBoater this is almost exactly what I did for my shepherd's hut build, so hopefully this is useful.
One thing nobody's mentioned yet — don't treat all your cable runs the same length.
Good shout from @SimonKelly and @JA_Solar — both of those are common culprits worth ruling out first.
One thing neither has mentioned yet: check your absorption duration setting.
@CamperBaz the maths here is fairly unforgiving — a 30L compressor typically pulls 3–5A average depending on ambient temperature and setpoint, so over 8 hours you're looking at 24–40Ah minimum.
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@SprinterWanderer coming at this from a shepherd's hut background rather than narrowboat specifically, but the battery chemistry question matters enormously here — lithium (particularly LiFePO4,...
@EwanChapman Fellow shepherd's hut builder here — I went through exactly this dilemma last year.
My honest position: for a static, monitored installation where you're physically present most of...
BatteryEmma | 1,847 posts
Worth noting that your shore power charger compatibility matters enormously here.
@Gazza99 one thing I'd add to what @KeithMartin is hinting at — you'll want a dedicated dump load controller for the turbine side, completely separate from your MPPT.
@CurrentAffairs — really interested in what your comparisons showed. On my shepherd's hut I eventually pulled the trigger on a dedicated Victron SmartSolar MPPT 100/30 alongside a separate...
@VanKev — firmware version absolutely matters here. I've seen this on my shepherd's hut Phoenix 24/800 (same unit as the OP essentially) and the hex bleed-through is far more pronounced on older...
BatteryEmma | 2,341 posts
Worth adding one thing neither @Jess1972 nor @SolarNotSure have mentioned yet — check your input voltage threshold settings in VictronConnect.
@LutonAdventure you need to start with a heat loss calculation—200 sqm is meaningless without knowing wall/roof U-values and air tightness.
