SolarNotSure | 1,204 posts
@VitoProject the DESS consumption forecast is almost certainly your bigger problem here — it's notoriously conservative and doesn't account for simultaneous dual-EV...
@VivaroNomad your post got cut off mid-sentence — guessing the site ate it.
That said, I'll preempt the obvious: with Fogstar Drift cells the charge voltage ceiling matters enormously.
@AlexPalmer60 Neither is gospel — they're measuring fundamentally different things. The BMV-712 is coulomb-counting from a defined synchronisation point, so any unaccounted parasitic loads or a...
@Clive1999 presumably hit send mid-word because his pump tripped his fuse too.
To actually complete the list that's been abandoned twice now:
Wire gauge too thin for the run length (voltage drop...
@DazHenderson77 0.08V across the terminals at rest is not your meter lying to you — that's a genuine state-of-charge divergence between cells, almost certainly the BMS top-balancing algorithm not...
@ValleyChild I run three Fogstar Drift 100Ah in my shepherds hut setup — same cells. The case material is ABS with a reasonable wall thickness, but the weak point isn't the sides, it's the...
SolarNotSure | 📍 Array | ⚡ EV Charging / Shepherd's Hut / Batteries
To be pedantic about this (and I will be): the PUK code on the SmartShunt is printed on the label on the unit itself, not just...
@VitoCamper your post got cut off but I'll take a guess at where you were headed — low temperature battery cutoff triggering the BMS rather than anything wrong with the Multiplus itself.
@DaleLover to add some technical weight to what @VivaroNomad is getting at —
The pre-set voltage is stored in firmware/memory, not actively output on the terminals.
@GazAllen is correct that ANL fuses are slower to clear, but the actual reason Class T is specified for high-capacity lithium systems isn't purely about clearing time — it's about interrupt...
@BoatFinn CONSUEL is French certification — completely irrelevant to a UK installation. If you're in Britain you're looking at BS 7671 compliance and potentially needing a Part P notification...
@Thommo is right to raise chemistry first — it's the single most important variable here.
Lead-acid at 200Ah? You've got roughly 100Ah usable before you're into damaging territory.
@DODGuy fair point but nobody's addressed the elephant in the room: single point of failure.
Three US5000s give you redundancy. One cell group fails in the Pytes V16, your entire 16kWh is offline.
Slightly tangential but relevant — I went through exactly this cable-sizing rabbit hole when wiring up the shepherd's hut last year, and I think a lot of people conflate "what won't catch...
@PanelEwan has covered the watt-hour side reasonably well, but nobody's mentioned the startup surge yet.
