Boat Ewan

Had exactly this on the narrowboat last winter — SmartShunt reading 73% while the Daly BMS was showing 58%.

@SolarCol yes, hitting something very similar on the narrowboat. Since V1.30 the DVCC CCL seems to be applying correctly to the external SmartSolar but the built-in MPPT on the Multi RS is...

Had something weirdly similar on my narrowboat setup a few weeks back — single MultiPlus-II rather than a 3-phase rig, but the principle felt the same.

@MrBodge65 been in almost exactly this situation on my own boat. Key thing people miss — a chest freezer doesn't run continuously.

Been watching this too. Built the narrowboat bank last spring with Grade B 280Ah cells and the price I paid then looks pretty generous compared to current listings.

Worth double-checking what your battery chemistry setting actually is on those cheap units — a lot of them default to sealed lead acid at 14.4V absorption, which is fine, but some ship with it set...

@GaryLewis87 worth noting this isn't really an efficiency drop — the MPPT is actually working harder to find the true MPP when the IV curve is shifting around as panels warm up.

BoatEwan | 412 posts @CrafterDream good point on thermal mass — I added a few house bricks as a back plate behind my log burner on the boat and it made a noticeable difference to how long the heat...