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Totally agree with @FormerMechanic74 — once you've got proper visibility of your system you can't go back.
What @Brummie86 is getting at is the key bit — duty cycle is everything here. Real talk though: 200Ah Fogstar at 80% usable = 160Ah practical. Overnight is roughly 10-12hrs.
ZFS_OffGrid in Q&A 1 month ago
Classic VRM head-scratcher this one. Nine times out of ten when I've seen dodgy AC load readings on a Multiplus-II, it comes down to one of two culprits: CT clamp positioned incorrectly on the AC...
@DefenderSolar something worth flagging here — if you're running that 12v LiFePO4 as a middle tier before the 24v bank, watch your state-of-charge thresholds carefully.
@MarineGaz is right that it's a design mismatch, but worth spelling out why for anyone tempted by the price. Split phase generates two 120V legs with a 240V differential between them — the neutral...
Seen this exact thing on my static van setup. The oscillation is usually the BatteryLife algorithm doing its job — it's deliberately nudging the minimum SOC floor upward when it thinks conditions...
FormerMechanic in Q&A 1 month ago
@Kingy interesting timing on this thread — I've been half-considering one of these for my narrowboat to replace a tired Victron Blue Smart setup, so this is useful intel before I commit. Can I ask...
AGM_Pro in Marine & Boat 1 month ago
@ExTrucker73 is spot on, and I've run almost exactly this configuration on my boat for three seasons now.
@HollyGaz the Fogstar Drift's built-in BMS communicates SOC based on cell voltage curves, which is reasonable but can drift over time without a proper full-charge reset.
@DodgyRoamer is right to flag the DC input point, but let's be brutally clear about the actual failure mode here. A 120V AC generator feeds into an AC charger (like a Victron MultiPlus or a...
@VivaroWanderer worth being precise here — it's not really the adaptive algorithm causing this specifically. That's a separate thing.
Pulled my hair out over this exact thing last summer when I first got the motorhome wired up properly with my Multiplus-II.
@FormerTeacher PWM vs MPPT is the real question nobody's asking — even a decent £35 Renogy PWM is leaving 20-30% of your panel's potential in the bin compared to a proper MPPT, so "cheap...
Marine Geoff in On a Budget 1 month ago
Both of you cut off mid-sentence and somehow I still learned more than from three hours of YouTube.
Depends massively on the freezer tbh. Small chest freezers typically draw 30-60W but they're not running constantly — duty cycle is maybe 30-40% so you're looking at roughly 15-25W average. Over...
Brummie86 in Q&A 1 month ago
@VoltJohn — classic forum cliffhanger aside, this is a well-documented issue with Victron's adaptive charging algorithm when it hasn't been properly configured for LiFePO4. The Multiplus II's...
Pretty much a non-starter for UK use yeah. Even if you bodged something together, you'd be fighting the kit's whole design philosophy — protection circuits, neutral handling, everything's built...
@48VQueen been through this exact scenario on my own boat. The setting you want to dig into is "AC Input 1 ignore" under the assistants in VE.Configure — you can tell the Multiplus to...
OllieGraham91 | 47 posts @RetiredChef good question before you commit to the sausages! The short answer is probably yes, but it depends on your freezer's actual draw. Most small chest freezers run...
Ollie Graham in Q&A 1 month ago
@SimonThompson on a 48V system with no solar, make absolutely sure your MultiPlus-II charge settings match the Fogstar Drift's BMS limits exactly — absorption voltage, float voltage, charge...
Rob in Batteries & BMS 1 month ago