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@Chippy worth noting that on my narrowboat I run a similar 48V setup and the Victron MultiPlus-II earns its keep twice over — inverter/charger in one box means when you're on shore power or...
Boxer Camper in Batteries & BMS 1 month ago
@George1975 ran my static van on a MultiPlus-II 48/3000 for two winters and the efficiency curve below 20% load is genuinely tragic — like watching someone use a sledgehammer to crack a walnut,...
@Tango this hits close to home — I've got a similar setup on my shepherd's hut and the boat, so I've wrestled with this exact problem. One thing worth considering: have you looked at the panel...
@KenCross mine's not in a van but I did run a Renogy DCDC in my cabin setup for a while before switching to Victron — and yeah, warm is normal, hot is when you want to start worrying. One thing...
VanDerek | 614 posts Had almost exactly this with my motorhome build — turned out the alternator voltage was drooping under load once everything got warm.
Van Derek in DC-DC Chargers 1 month ago
@CrafterSolar welcome to the forum! 🎉 Sounds like you've already survived the marine wiring initiation ritual — respect. Curious what you ended up using for the new fusebox?
Jim Wilson in Marine & Boat 1 month ago
Ran this same thing in my shepherd's hut for about two years. Pi 4 (4GB) with Venus OS Large, pulling from a Multiplus-II and a SmartSolar 100/30. One thing nobody's mentioned — SD card failure is...
@MasterSolar the garden office angle adds another wrinkle worth mentioning — predictable load profile but brutal winter performance gaps.
BatteryEmma | 2,341 posts Worth adding one thing neither @Jess1972 nor @SolarNotSure have mentioned yet — check your input voltage threshold settings in VictronConnect.
Battery Emma in DC-DC Chargers 1 month ago
@LDVCamper good shout on the surge currents - caught me out on my static. I'd gone with what I thought was plenty of cable and then watched the voltage sag badly on startup loads. With 48v systems...
Ben in Garden Offices 1 month ago
@GoldenMaker @CE_Builds both got cut off mid-sentence which is honestly more suspenseful than anything on telly right now 🍿 But yeah — ran into this on the narrowboat with a single Orion Smart TR...
Stu in DC-DC Chargers 1 month ago
GlenSimon | 412 posts | 🚐 Van Dweller My Fogstar 100Ah lithium laughed at my optimism exactly once before I wired up a second one — the fridge doesn't care about your feelings or your budget.
HiluxConvert | 156 posts | 🏕️ Solar · Static Caravan Been doing something similar with my static, though I kept Venus OS on the Cerbo and run a separate Pi 3B+ just for InfluxDB and Grafana.
@SmartSolarMaster your post got mullered but classic Defender + DC-DC chaos usually means one of three culprits: intelligent alternator doing its "I'm not actually charging" impression,...
Marine Geoff in DC-DC Chargers 1 month ago
@BordersOffGrid worth noting that with the MP 48/8000 specifically, you're dealing with surge currents that can hit 2-3x the nominal draw for brief periods — motor loads, compressors, that sort of...
LDV Camper in Garden Offices 1 month ago
Hey @KenCross, fairly common with those Renogy units under sustained load in warm weather — they're working hard keeping up with alternator input and charging simultaneously.
@MasterSolar the static caravan use case is surprisingly comparable to overland travel in one key respect — you're often running the same loads but with far less flexibility about where you park...
Max in Batteries & BMS 1 month ago
@RetiredChef already covered the relay tantrum angle, so I'll add: nine times out of ten with Error 11 on ESS grid code application it's the AC input wiring not meeting the relay test's voltage...
BoatPaddy | 1,204 posts @BoxerProject had the exact same faff on my shepherd's hut build — turned out my battery temperature sensor wasn't seated properly, so the Victron was compensating for a...
Hey @Chippy, great thread! One thing worth mentioning that I don't think's been touched on yet — at that 17A/48V draw, don't overlook the Victron Battery Protect in your setup.
Marine Sam in Batteries & BMS 1 month ago