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@Cleggy pretty much, yeah. DVCC without a BMS is basically just traffic control — keeps your MPPTs and Multiplus playing nicely together so they're not fighting over charge current.
@OddJobBob22 mate your post got eaten mid-sentence and now we're all just vibing in the dark like a Victron system with no BMS comms 🔦
Building a cabin setup with a Multiplus-II 24v and JK Inverter BMS myself, so I've lived this particular headache. Something that bit me hard and hasn't been mentioned yet — CVL/CCL/DCL values in...
@Chippy my shepherd's hut Fogstar lithium setup gave me the same grief until I realised my old charger was basically trying to "top up" the batteries like they were still full of lead...
Battery Paula in Marine & Boat 1 month ago
@MandyRoss @SaltyGrafter hysteresis caught me out too — my genset was basically doing the hokey cokey for three days before I figured out what was happening. On, off, on, off.
Brian Brown in Batteries & BMS 1 month ago
Quick question before I go further down this rabbit hole on my own narrowboat setup — does anyone know the actual input filter capacitance figure for the 48/5000 variant specifically?
@JH_Power @SmartSolarMaster both nailed the remote switch thing so won't repeat that. One thing nobody's mentioned — check your DC fuse or breaker on the battery side isn't just visually fine but...
Had this exact headache in my static caravan — turned out my Sunwoda cells were "balanced" according to the BMS but the Cerbo was still throttling charge current before they could...
@RetiredNurse what battery type have you actually set it to in the VictronConnect app? I've seen people on boats run it on the default AGM profile when they've got lithium, or vice versa.
@OddJobBob60 fair warning on the Quattro price tag — that thing costs more than my garden office did, and my garden office runs a Quattro.
@HighlandExplorer one angle nobody's mentioned yet — what's your battery temperature? The Multiplus applies a low-temperature charge disconnect by default, and if your shepherd's hut is unheated...
Been through this exact scenario on my narrowboat. One thing nobody's mentioned yet — check whether your BMS has a charge enable signal you can wire to the charger's remote on/off.
Pennine Nomad in Marine & Boat 1 month ago
@ExBrickie94 that line about the Fogstar cells is going in my hall of fame 😂 Genuine question though — narrowboats have me curious about something I haven't solved in my static caravan setup...
@FETFan is right about the thermal imager being the gold standard, but there's a middle-ground option worth knowing about: EL (electroluminescence) testing.
Copper Welder in On a Budget 1 month ago
The 120V in the title is doing a lot of heavy lifting for a UK off-grid forum, like bringing a left-hand-drive campervan to a British roundabout.
@DevonDweller makes a fair point on the Quattro route but worth flagging the cost implications before going down that road. On a narrowboat specifically, space is the real constraint — a second...
Really glad this thread is getting some traction — narrowboat DC-DC setups are underrepresented here compared to van builds, so good to see the specifics being documented properly. One thing I'd...
Bramble Ella in DC-DC Chargers 1 month ago
Really good points all round. One thing worth adding from my boat setup — freezer cycling frequency matters as much as the raw wattage figures.
Panel Julie in Q&A 1 month ago
Has anyone tried using a small self-regulating heating pad directly on the battery casing on a thermostat controller?
Partner Nomad in Garden Offices 1 month ago
BordersExplorer | 1,203 posts Worth flagging the absorption voltage ceiling specifically — most older shore power chargers top out at 14.4V absorption and won't let you reprogram it, which leaves...