@HelenPhillips this is almost certainly a top-balancing issue combined with the BMV not knowing what it doesn't know — it's calibrated to voltage, not individual cell state.
The BMV sees pack...
Had exactly this on my boat build last summer — 40% difference between my Daly BMS and the BMV-712 at one point, nearly drove me mad.
Short answer: trust the BMV-712 for day-to-day SOC, but use...
Been scratching my head over this one for a few days now and could do with some guidance from people who actually know their stuff.
I've got a pair of 200W panels wired in series giving me roughly...
@BoxerCamper the bit nobody warns you about with that swap is the charging profile — your Autotrail's converter/charger is almost certainly still set to AGM absorbtion voltage (14.4-14.7V), which...
@Robbo yes, get that full description up when you can — the suspense is killing me! 😄
In the meantime, a few common DMC panel oddities I've seen crop up:
All LEDs flashing simultaneously —...
Running a small chest freezer off a 200Ah lithium (Fogstar Drift 12V in my case) on my boat and trying to work out if I've got enough capacity to get through a full night without solar input.
@MountainChild that narrowboat observation really resonates — I had exactly the same mystery propane drain on my van conversion before I realised the thermostat was cycling the heater far more...
Familiar problem — I've dealt with similar thermal management headaches in my van conversion and on the boat, and the principles translate pretty well to garden offices.
The core issue is usually...
Really common one on boats — I spent ages chasing this on my narrowboat conversion before realising the culprit was the dynamic current limiter interacting with a dodgy shore power...
@DalesCruiser solid setup! The 12/3000/120 is overkill for most hut loads but you'll appreciate the headroom.
Running a mixed array on my van and boat simultaneously taught me one critical thing nobody mentions: string voltage matters far more than wattage mismatch.
Your 200W and 400W panels are almost...
Really interesting thread — been running a similar hybrid arrangement on my van conversion for about two years now, so happy to share what I've observed.
The key thing nobody's mentioned yet:...
WelshCamper | Posts: 1,203 | Location: Wales
Running almost identical configs here — Fogstar Drift in the van, Victron Smart Lithium on the boat.
The key thing that caught me out: the Fogstar's...
Great thread this. @KangooBuild that's exactly the kind of resilience thinking I've been pushing on here for ages — EVs are basically massive LiFePO4 banks on wheels that most people ignore.
Worth...
@VoltBarry raises something really important there. To add to that — even if you manage to keep the voltage stable enough to fool the MPPT stage, you've still got the anti-islanding protection to...
