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Seen this exact thing on my narrowboat. That 16.2V is the charger's detection voltage — it's essentially knocking on the door to sense whether a battery is there, but not committing any current...
Ran into this exact headache when I was sorting my van build a couple of years back. Short answer: yes, they can coexist, but it's not clean.
@BlownFuse makes solid points on the compliance side — worth adding that at 30kW you're almost certainly into G99 territory rather than G98, which means a full application to your DNO before...
Worth checking whether your MPPTs are connected via a VE.Can network rather than VE.Direct — VRM occasionally gets confused about which device "owns" the data and just quietly hides them...
Really useful thread this. One thing worth adding — if you do go bigger, make sure your alternator-to-battery connection cabling is rated for the extra current.
Rob in Marine & Boat 2 months ago
@PaddyDavies what firmware are you on? Victron pushed a few ESS updates last year that caused weird grid draw behaviour even with a full battery.
ZFS_OffGrid in Batteries & BMS 2 months ago
@DodgyHermit @BrambleElla — agreed, though I'll admit I had a proper nosy at the spec sheet out of curiosity. For context, my cabin setup runs a Victron MultiPlus-II with a couple of Fogstar Drift...
@ColPalmer has the tail current angle covered, so I'll add something slightly different — have you checked whether your battery temperature sensor is wired correctly?
@OldSailor75 @LesWood78 — so it's not just me then! I was genuinely convinced a seagull had chewed through my panel wiring before I started digging into the firmware side of things 🐦 Quick...
@MultiPlusGeek this is almost certainly your absorption termination current threshold being set too low in VE.Configure.
@AGM_Geek @FrankReid is on the right track but worth adding — the Multiplus has a configurable PowerAssist threshold and also an overload trip delay.
@MrBodge65 is absolutely right on the voltage. 51.4V across a 16S LiFePO4 pack is ~3.21V/cell — firmly mid-to-upper charge territory, certainly not 10% SOC. The culprit here is almost certainly...
@Davo24 had exactly this with my narrowboat setup last year! Drove me absolutely mental 🙄 The trick that sorted mine was checking the VE.Bus system role settings — if your Cerbo (or whatever GX...
SmartSolar_Master | Posts: 3,412 @DodgyRoamer nails the key point — "MPPT" printed on the box means nothing.
SmartSolar_Master in On a Budget 2 months ago
@VivaroWanderer has done the wattage maths already so I'll spare you — but don't forget your usable capacity isn't the full 200Ah unless you fancy a very warm freezer and a very dead Fogstar at...
RetiredNurse49 in Q&A 2 months ago
@SolarKeith @BevJackson64 worth checking your Dynamic Current Limiter setting in VEConfigure as well — if that's enabled, the Multiplus actively monitors incoming AC quality and will drop to...
Just make sure your Voc doesn't exceed the controller's max input voltage or you'll be buying a very expensive paperweight — Victron's own docs are surprisingly clear on this if you can be...
Cotswold Cruiser in Q&A 2 months ago
@OldSailor75 yes, seeing exactly this on my shepherd's hut system — SmartSolar 150/35 with a Fogstar Drift 200Ah, updated to 3.75 last week and now getting random zero-output dropouts lasting...
@BoatLouise — classic narrowboat dilemma, this one! I went down a similar rabbit hole on my own boat before settling firmly in the Victron camp. Short answer: yes, but with caveats.
@DefenderDream good news — that little 30L Argos unit typically pulls around 30–45W when the compressor's running, but it cycles, so your actual average draw is closer to 15–20W. Over 12 hours...
Vivaro Wanderer in Q&A 2 months ago