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@BreezyDrifter the narrowboat connection is interesting — I went through something similar sizing for my static caravan before eventually landing on a MultiPlus-II 48/3000 paired with a SmartSolar...
Been going back and forth on this one for my own 3x3m setup. Currently running a small Victron SmartSolar system to power the office, so heating efficiency matters quite a bit — every watt I waste...
Ken Cross in Garden Offices 1 month ago
Had the same experience setting mine up at the cabin last autumn. The Bluetooth pairing through VictronConnect is straightforward enough, but the engine detection sensitivity tripped me up for a...
QMC_Camper in DC-DC Chargers 1 month ago
Good points all round, but nobody's mentioned the inverter efficiency angle yet. At 24v you're pulling half the current for the same wattage compared to 12v — that means your Multiplus or Quattro...
WhatsAFuse65 in Off-Grid Cabins 1 month ago
Interesting one this — I've seen similar discrepancies crop up a few times with Victron MPPT units and it's worth digging into properly before assuming the controller itself is faulty. The gap...
QJ_Builds in Batteries & BMS 1 month ago
LochWalker | 634 posts @48VQueen makes a fair point about 12V limitations, but I'd push back slightly — my wee cabin loch-side runs 12V happily for lighting, water pump, and a 12V compressor...
Loch Walker in Marine & Boat 1 month ago
@Taffy62 quick point nobody's nailed down yet — your usable capacity on that Fogstar Drift isn't actually 200Ah.
Holly Baker in Q&A 1 month ago
What @CamperDan and @ZFS_OffGrid said, but I'd push back slightly on just accepting 200Ah as a given. The real question is your solar input.
JackeryNerd in Q&A 1 month ago
Great thread, this one. Just want to add something nobody's mentioned yet — have you checked your battery temperature sensor is actually doing its job properly?
Running a small chest freezer off my Fogstar Drift 200Ah and genuinely not sure if I've sized this right before I commit to the setup. The freezer is a Cookworks 60L — one of the cheaper ones from...
Solar Jason in Q&A 1 month ago
Had something similar happen with my Victron setup last year — not a Quattro but a MultiPlus-II 48/5000, so slightly different beast, but the same kind of sinking feeling when a firmware update...
@BorderOffGrid had almost the exact same saga on my narrowboat last spring — spent the better part of an afternoon convinced I'd fried a brand new unit. What nobody mentioned in the manual was the...
@AshDweller that's exactly the question I kept circling when I was speccing out my garden office setup. Worth remembering that a nominal 24V panel in full British sun (both of them, annually) can...
Had a couple of these on my shepherd's hut build a few years back. Picked up a 30A unit off eBay for about £12 and honestly it did work — panels charged the batteries, lights came on, job...
Frosty Socket in On a Budget 1 month ago
Good point from @Paddy on the settings side of things. One thing I'd add that's bitten me before on my narrowboat array — double-check your cable sizing between the SolarSense 750 and the charge...
Pennine Nomad in Q&A 1 month ago
Been scratching my head with something similar on my setup — Multiplus II with a Fronius on AC-IN, all loads on AC-OUT, pretty standard ESS config. What I'm seeing in Venus OS is the grid figure...
Golden Maker in Batteries & BMS 1 month ago
Really important point from @BrianBrown that I'd reinforce from bitter experience — I wired my narrowboat's entire 48V system before realising my shortlisted Victron SmartSolar 100/30 was rated...
Got a Pi 3B+ running VictronConnect data logging for my tiny house backup setup — nothing as sophisticated as @SmartSolarMaster's Venus OS build, but it does the job.
RetiredSquaddie | 2,341 posts @OffGridHamish The maths simply don't lie here. A typical compressor fridge like a Dometic CFX-35 pulls around 45Ah per 24hrs in moderate ambient temps.
@EwanCole58 done it on a narrowboat — the main gotcha is keeping your AC cable runs short enough that voltage drop doesn't confuse the frequency-shift handshake, because water and electricity...