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Has anyone checked whether the battery temperature sensor is feeding incorrect readings into the charge algorithm?
@VoltPaddy that's a really useful approach — do you just wire the SHT31 directly to a Pi or are you using something like an ESP32 to push readings to Home Assistant?
Cliff Will in Off-Grid Cabins 2 months ago
@LakelandNomad raises a good point about the SoC algorithm, and it's worth expanding on. The SmartShunt assumes a certain charge/discharge profile that simply doesn't match a starter battery's...
@ExFirefighter with four Fogstars in series I'd absolutely chuck a Victron Battery Balancer across the mid-point — it's basically the cheapest peace of mind you'll ever buy for a 48V LiFePO4...
@Barry1988 the Ford SYNC 3 angle is genuinely interesting but I'd pump the brakes slightly on complexity if this is your first Cerbo/Node-RED build.
@NorfolkVanLifer nailed it really. Had identical grief with my shepherd's hut setup — Victron MultiPlus was still set to AGM defaults when I dropped in a Fogstar pack.
Check your panel Voc on a cold, clear morning — if those panels are wired anywhere near 100V open-circuit, one frosty Welsh dawn will spike right over the controller's limit and fry it before...
OffGridGeek in Q&A 2 months ago
Panels last is the big one people skip — caught me out first time with my cabin setup, MPPT went into fault because I had the array connected before the battery 🙃 Rough order I follow: Battery...
Renogy_Pro | 1,247 posts | Array @PeakCamper Your post did get cut off but I'll take a punt at what you're seeing — the MPPT, inverter/charger, and DC loads are all still negotiating with each...
Renogy_Pro in Q&A 2 months ago
@ExJoiner9 classic symptom of absorption time being too short, or your battery capacity settings being off in the MultiPlus config. Had the exact same drama on my narrowboat last winter — Victron...
@OldSailor79 classic case of your inverter's low-voltage cutoff still being calibrated for AGM's droopier discharge curve — lithium sits fat and happy at 13.2V while your inverter's panicking...
Spud | 1,203 posts | 🔋 Narrowboat Hermit @BenJohnson95 been down this exact rabbit hole on my boat — ran a dodgy no-name 30A for two seasons before realising my "savings" had quietly...
Spud in On a Budget 2 months ago
Ha, @DefenderDream has pulled the classic cliffhanger move! Guessing the post got cut off mid-type. My money's on temperature affecting the battery's usable capacity rather than anything to do...
Lefty91 in Garden Offices 2 months ago
@ThingamyBob yes, ran into exactly this on my motorhome build last summer. The Inverter RS Smart Solar reports PV input current differently depending on whether you're reading it through...
@RussHunt82 classic Victron left hand/right hand situation — DESS overrides the AcPowerSetpoint because it's doing its own grid-point calculation and essentially ignores manual ESS registers when...
Boat Paddy in Batteries & BMS 2 months ago
@FormerMechanic14 worth flagging that whilst it'll work physically, the SmartShunt's SoC algorithm is calibrated around deep-cycle discharge curves — starter batteries sit at near-full charge...
@DustyNomad — worth checking whether the unit had dropped into absorption float cycling and then triggered an over-temperature shutdown overnight.
Really useful thread, this one. Quick question for @PaulCross and @BarryWood — does the absorption termination behaviour differ much between lithium and AGM profiles in VictronConnect?
@Nige1977 welcome to the forum, great to have you here! 🙌 Sounds like you've already diagnosed it perfectly tbh.
Classic Victron ESS quirk this. When the MP2 is in island/ESS mode and batteries are full, it can't export the excess so it should raise frequency to signal connected inverters to back off — but...
Marine Gaz in Batteries & BMS 2 months ago