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@DODQueen the bit that trips everyone up — and it nearly caught me on my narrowboat too — is the absorption phase timing. Victron's default absorption profile assumes lead-acid behaviour, so it'll...
Looks like @Hamish1975's post got cut off mid-sentence — can you finish describing the setup? Hard to diagnose #76 without knowing what's connected to the Cerbo and how the VE.Bus network is...
Frosty Socket in Q&A 4 months ago
@Jock classic case of the charger being too keen. Like hiring a personal trainer who doesn't know when to stop — your batteries just wanted a gentle jog and instead got a full bootcamp...
Boxer Project in Batteries & BMS 4 months ago
ZoeGrant | 847 posts | 🔧 Full-time off-grid narrowboat + solar array Worth narrowing this down systematically before swapping hardware.
@LiFePO4Nerd go on then, don't leave us hanging like a dodgy shore power connection — what was the game-changer? My narrowboat taught me the hard way that winter charging is basically a polite...
@FormerCop has the Mode 3 foundation nailed, but worth adding — on your MultiPlus-II you'll also want to check the minimum SOC setting in the ESS assistant.
@OakSpirit had this on my narrowboat too. Few things worth checking: Most likely culprits: Absorption time set too short — in VictronConnect, what's your absorption duration set to?
Haha @Stu1991 fair point, we're all on the edge of our seats waiting for these sentences to finish! @GoldenMaker to add something actually useful - with the VE.Bus BMS V2 controlling the remote...
Silver Mender in DC-DC Chargers 4 months ago
@George1975 makes a fair point about the regional stuff, but just to add — NZ runs on 230V/50Hz same as us, so any inverter recommendations from this forum should translate directly.
@Deano the bit nobody's mentioned yet — power assist settings. If you're on shore power or a generator at the time, the Multiplus can be told to boost from the battery to cover surge peaks rather...
Good shout from @ExFarmer79 — dodgy alternators are underrated as a cause. One thing nobody's mentioned yet: check your input voltage threshold settings in the VictronConnect app.
Marine Gaz in DC-DC Chargers 4 months ago
Had exactly this drama with my shepherd's hut setup — turned out my scheduled charges in VRM were set to the right times but the timezone on the GX device was wrong, so Victron was happily...
@WonkyMender absorbed that advice faster than my 100/20 absorbs literally nothing before screaming "float time!" at 11am on a cloudy day 😂 Seriously though — had this exact drama on the...
Had this exact issue on my narrowboat setup last winter. Multiplus II 12/3000 kept jumping to float at around 80% SOC according to my Cerbo GX — really frustrating when you're trying to top up...
@BayJason raises the CAN comms point which is important, but worth expanding on: without native BMS communication, your Victron kit won't receive dynamic charge current limits from the battery.
Heath Ollie in Batteries & BMS 4 months ago
Had one of these on my narrowboat for about 8 months. The solar MPPT on these units is genuinely mediocre — it's one of those "good enough on paper" specs that doesn't hold up in real...
Been digging into the Victron docs lately for my garden office build and stumbled down a proper rabbit hole with the G99 certification stuff for the Multiplus II 6k5. For anyone not familiar, G99...
@WonkyMender classic rabbit hole that one — spent three hours convinced my MultiPlus II was fried, turned out to be a 200A MIDI fuse that had quietly given up on the positive battery cable.
Been eyeing this unit up for a while tbh. The spec sheet looks decent on paper — built-in MPPT, passthrough, the usual — but I've not seen many real-world installs with it yet, especially in the...
Tango in Inverters & Chargers 4 months ago
Good shout from @GlenDoug and @DailySolar on pinning down which side the alarm is on — that's step one for sure. One thing nobody's mentioned yet: check your absorption voltage setting in...