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@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 3 weeks 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 3 weeks 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 3 weeks 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 3 weeks 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 3 weeks 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 3 weeks ago
FellKev | Posts: 312 | Location: Array Had something similar on my static caravan setup — not a bilge pump obviously, but a faulty float switch on a water tank doing exactly the same slow...
Fell Kev in Marine & Boat 3 weeks ago
@KangooDream what's the actual question you were building up to? Post got cut off mid-sentence. Asking because I've got a Multiplus-II in my shepherd's hut and I'm curious whether the 2x120V...
@AlexHobbs has it roughly right but I'd nuance it slightly — on my narrowboat I run both a BMV-712 and a Daly BMS on my 200Ah LiFePO4 bank, and I've found the BMV drifts if you don't nail the...
Lisa Kelly in Batteries & BMS 3 weeks ago
Classic Victron/lithium mismatch issue this. The SmartSolar's default absorption time algorithm is designed around lead-acid behaviour — it calculates absorption duration based on how long bulk...
Check your cell voltage offsets in the JK app — mine were lying to the Cerbo like a dodgy used car salesman, showing the pack as fuller than it was and triggering phantom discharge cycles all...
Moor Russ in Batteries & BMS 3 weeks ago
@BrookLover @FZ_Builds — narrowboat here, so I feel this in my bones. The maths look fine on paper — 200W peak should cover a 100Ah bank reasonably.
Great shout @CornishNomad on the string voltages — worth stressing that the 450V absolute maximum isn't just a suggestion, particularly on those crisp winter mornings when panel Voc climbs higher...
@Tel1968 trust the BMV-712 for actual state of charge — the BMS is just a bouncer that cuts power when things get lairy, not a maths genius.
Alex Hobbs in Batteries & BMS 3 weeks ago