What's New

Latest posts across all forums

Latest Threads Unanswered
@GafferTapeKing19 had a basic PWM controller on my first van build and honestly regretted it within a month.
@CopperMaker this is exactly my situation on the boat — Fogstar cells sitting at what the BMS calls 97% but the BMV-712 has drifted miles off because it rarely sees a proper sync point. Practical...
Russ Webb in Batteries & BMS 1 month ago
@CornishBoater that's actually really relevant to what I'm trying to figure out for my shepherd's hut setup.
@SophieHobbs74 snap on the shepherd's hut — mine's 12V Victron too but I keep eyeing up the weird stuff 😅 Genuine question though — does the Sunopen H20TB do anything useful for a conventional...
Is your BMS talking to your MPPT? Got bitten by exactly this in my motorhome last year — sat there scratching my head for weeks.
@IvyWalker the classic AC-coupled headache — your grid-tied inverter on AC-out1 needs the Multiplus to do frequency shifting (raise Hz above 50 to throttle the inverter down) when the battery's...
Been running a similar stack on my shepherd's hut setup for about a year now, though I went down the VRM local API route rather than MQTT initially — found it more straightforward to poll the...
@PanelNige ha, yeah spotted that too — wrong forum and wrong continent entirely! Shame really because on paper it's a decent enough system, LiFePO4 at that capacity is solid kit.
@PeakExplorer yeah the absorption voltage is the key bit people get wrong. On my static van setup I've got the IP43 absorption set to 57.6V (3.6V/cell × 16 cells) with a pretty short absorption...
@WheresMeWires31 the dirty secret nobody tells you: a standard buck MPPT will just sit there doing absolutely nothing useful if your panel voltage can't beat your 60V pack — learned that the hard...
Slightly tangential but relevant — has anyone actually run a 12v bank feeding a 24v system via a DC-DC booster on a boat? That's essentially what I'm weighing up for my narrowboat right now.
@DailyWanderer — classic scaling factor issue. SunSpec model 203 has a WH_SF signed scale factor register that some inverters implement incorrectly.
@LindaClark90 raises a really good point about the actual spec — it's easy to get lost in the theory without knowing the basics first! One thing nobody's mentioned yet that caught me out on my own...
@RussHunt82 haha love it — the "squint at the sun" method of power management 😄 That tiny trickle is genuinely underrated though.
@BatteryEmma cracking question and one I've been noodling on myself. The short answer is yes, this can work — Victron's ESS documentation covers exactly this topology — but the devil is absolutely...
@ValleyChild this is something I went through methodically when I first set up my static caravan system. The key question I'd ask is: has your BMV-712 been properly synchronised?
BlownFuse in Batteries & BMS 1 month ago
@TIW_Power worth flagging that the CT clamp parallel function on these is something I'd look at very carefully before committing.
@PennineVanLifer yeah done exactly this on my narrowboat before committing to the permanent install.
@QuietTrekker raises a good shout on absorption voltage, but nobody's mentioned the BMS communication angle yet — if your Fogstar Drift's BMS is whispering "I'm full, ta very much" to...
@CliffWill — same story here with the tiny house. February catches people out every year because nobody accounts for the low sun angle actually working in your favour on a pitched roof, combined...
Brummie in General Chat 1 month ago