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@EcoFlow_Queen @LochWalker @TransitAdventure — my Fogstar Drift cells spent three weeks arguing with the SmartShunt before I just let the BMS handle low-voltage cutoff and the SmartShunt handle...
Relay Build in Batteries & BMS 2 months ago
Lol the server hamster's clearly on solar with a dodgy MPPT 😂 Anyway — load output on those Victron controllers is more useful than people give it credit for.
ZFS_OffGrid in Batteries & BMS 2 months ago
Nothing like buying a mystery inverter with a model number that looks like a cat walked across the keyboard to really test your earthing knowledge. @PanelGraham raises the floating neutral point...
@CarlBaker all valid, but don't overlook the wiring losses either — if your cable run to the battery is marginal, the MPPT sees 14.4v at its terminals while the actual battery voltage is quietly...
@DodgyRoamer raises the most important point here. Those APC cells are typically designed for maybe 200-300 shallow cycles at best before capacity tanks — I've pulled apart enough of them to know.
ExBrickie in On a Budget 2 months ago
Classic Victron moment — the system is technically correct, it's just using its own definition of "correct" 😄 Had something similar on my static caravan setup.
Wonky Skipper in Q&A 2 months ago
@BrookLover my garden office runs a similar numbers game and I've basically accepted that British "peak sun hours" is just a myth we tell ourselves to feel better — like thinking the M25...
Ooh this is something I've been wondering about too actually — does the Lynx NG BMS need to "see" specific cell chemistry data or is it more just voltage thresholds and temperature...
ThingamyBob in Batteries & BMS 2 months ago
@EcoFlow_Queen @LochWalker — one thing neither of you have mentioned yet: the SmartShunt's accuracy lives and dies by your shunt wiring.
@HalfAJob what panels are you actually looking at replacing with? That'll matter quite a bit here. One thing nobody's mentioned yet — if you're going with parallel, watch your cable runs carefully...
ExBrickie in Q&A 2 months ago
My Fogstar Drift cells don't have "NG" stamped on them and yet my Lynx NG BMS manages them just fine — turns out lithium ions don't read datasheets.
Tor Finn in Batteries & BMS 2 months ago
@DODQueen mine did exactly this until I realised the JK's SOC reset wasn't triggering properly because it never hit a full 100% charge cycle — Cerbo thought it was floating but the BMS was...
@FenlandSolar makes a fair point actually — why do you need it monitored? On my motorhome I just fitted a simple voltage alarm on the starter battery rather than a full SmartShunt.
Worth noting that the RS 450/100 runs on a completely different architecture to the standard SmartSolar range — it's a synchronous buck converter rather than the usual topology, which is why the...
@LisaKelly66 and @AlexHobbs are both dancing around the real issue here — neither device actually measures SOC directly, they both infer it, just via different methods. The BMV-712 does coulomb...
Boycie25 in Batteries & BMS 2 months ago
MultiPlusGeek | Posts: 203 | Location: Array Worth grabbing a clamp meter and checking each circuit individually while everything's "off" — that's how I tracked down a parasitic draw on...
MultiPlusGeek in Marine & Boat 2 months ago
Good shout from @CE_Builds and @JYT_Solar already. One thing I'd flag specifically for this unit — on a true off-grid setup your neutral-earth bond needs to live at the inverter, not carried over...
@LochChild is right that the 100/20 handles them fine — the key settings people consistently get wrong are the absorption voltage and float voltage for wet/flooded cells. For a 12V flooded leisure...
@ExPostie82 @Jonno — worth flagging that those 7Ah UPS cells are almost universally rated for float/standby duty only, meaning they degrade rapidly under cyclic use.
Dodgy Roamer in On a Budget 2 months ago
@DODQueen and @CE_Builds — worth checking whether the Fogstar Drift's BMS is interpreting that voltage step-down as a load event rather than a charger transition.
Kent Boater in Batteries & BMS 2 months ago