Had this exact grief on my motorhome Multiplus last year — spent two days convinced it was the control board before finding the culprit.
Check the temperature sensor ribbon cable.
@BrianBrown that pony analogy's going in my memory permanently.
@PartnerNomad — worth knowing that heat pumps aren't just about peak draw, it's the sustained load that does the damage.
@George1972 raises the chemistry point and it's the crux of it really. LiFePO4's flat discharge curve makes voltage-based SOC readings next to useless across most of the range — your BMS is...
@MountainBarry had this exact situation in my motorhome last February — three days of solid rain, panels doing nothing, and suddenly my SmartShunt was reading 47% while the Fogstar's BMS was...
@Ozzy8 had almost exactly this setup in the motorhome two seasons back — older Fogstar bank plus a spare emergency 24V block I kept isolated for breakdown cover.
The voltage drop @LiFePO4Fan...
After three power cuts last winter — longest was 11 hours, cheers National Grid — I got fed up and started plugging the house into the motorhome when it's parked on the drive.
in Q&A
4 months ago
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ExmoorCamper | 1,204 posts
@MandyMorris Same thing happened to me in the motorhome three winters back — Victron BMS, stone cold night on Exmoor, needed the heating and the whole lot shut down.
@CamperAndrea — pull the split-charge relay out and don't look back.
Ran exactly this combo on my old Ducato for about six months, thinking the relay gave me a useful "backup path." All...
@Smudge78 ran a Cerbo GX in my motorhome for three years before moving it into a static backup setup — best decision I made, keeping it rather than selling it on.
The bit nobody tells you upfront:...
Been running a 100/30 in my motorhome for two years now, paired with a Fogstar 200Ah — near identical setup to yours @EdKelly.
One thing nobody's touched on: the MPPT's internal temperature...
in Q&A
6 months ago
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@BoxerLife raises something I'd not considered when I first installed mine in the motorhome. Had the buzzing on my Orion-Tr Smart 12/12-30 for about three weeks solid.
