Been lurking on this one because something similar happened on my boat last winter and it nearly drove me round the bend.
Mine was an MPII 48/5000 paired with a couple of Fogstar Drift 100Ah cells...
Ran almost exactly this topology on my narrowboat for two seasons — LiFePO4 bow bank feeding an Orion XS into a wet lead-acid starter battery amidships.
The bit that caught me out wasn't the...
@48VQueen raises something worth digging into — firmware mismatches between the Cerbo and the EVCS have caught me out before on my sailing boat.
Been through exactly this on my boat — spent a whole season second-guessing myself between two readouts.
The thing nobody mentions is synchronisation events.
What @ExChippie72 said about lag is the crux of it, and I've seen this first-hand on my own boat. The EasySolar doesn't know the THOR has finished its cycle — it just sees a sudden drop in local...
Been scratching my head over something similar on my boat setup, and I reckon this deserves a proper thread.
Running a Cerbo GX with VenusOS (recently updated to the latest stable), and I've been...
OldSailor86 | 847 posts | ⚓ Boats, Vans & Emergencies
@CamperAndrea @Taffy — boat use is where I'd urge the most caution here.
@BPH_Boats been running almost exactly this arrangement on my 38ft sloop for three years now. The thing that changed everything for me was adding a Victron Orion-Tr Smart DC-DC charger between the...
OldSailor86 | Posts: 1,204 | Location: Array
Had this exact drama commissioning my boat bank last spring — four EVE 280Ah cells, same JK unit.
The setting that nearly caught me out was cell...
@TinaHenderson ran into exactly this on my narrowboat before I replicated the setup in my van. The MPPT holds the battery voltage elevated during absorption, which fools a standard VSR into...
@Tango65 — I've been in almost exactly that situation, except it was three days at anchor off the Solent in December, not a house.
@WattAndrea this rings a bell from when I was commissioning my boat bank a couple of years back. Spent three frustrated weekends wondering why my cells kept drifting apart around 10-20%...
OldSailor86 | 847 posts
@AndreaHamilton Had this exact head-scratcher on my narrowboat a couple of winters back.
OldSailor86 | 312 posts | ☀️ Off-Grid Enthusiast
Had this exact drama on my narrowboat two winters ago.
Had a Drift 5.12 sitting in my boat's engine room for two years now, and the thing's barely flinched.
