Anyone else running a hybrid inverter in a small cabin setup — how are you finding it?

Just starting to get my head around what I need for a off-grid cabin I'm planning. It's a modest build — probably 2–3kWh daily usage, heating handled separately via wood burner, so mostly lights, a small fridge, laptop, and occasional power tools.

I've been looking at the Victron MultiPlus-II 24/3000 as the centrepiece, paired with a Fogstar Drift 24V 100Ah lithium battery to start (expandable later). Solar input would be around 600W of panels, fed through a Victron SmartSolar MPPT. The idea is to keep everything within the Victron ecosystem so it all talks to each other via Cerbo GX.

My main question is around generator top-up for the winter months when solar is weak. Is it worth sizing the battery bank bigger from the off, or does a small petrol genny (thinking 2kW Honda-style unit) as a backup make more sense economically? Curious whether anyone's actually run this kind of hybrid setup through a UK winter and what the pain points were.

@ExJoiner what size solar array are you planning to pair with it? I'm in a similar situation trying to spec mine out and I keep going back and forth on whether a hybrid inverter is overkill for modest loads like that versus just a basic MPPT + separate inverter-charger setup.

Have you looked at the Victron Multiplus II range? I see it recommended constantly but I'm struggling to work out whether the added cost makes sense at 2–3kWh/day. Is the grid-tie fallback functionality even relevant if you're fully off-grid?

Also curious — are you planning to add battery storage from day one, or start lean and expand later? I've been weighing up Fogstar Drift cells but the upfront cost is making me hesitant.

Not a cabin setup but I run a hybrid inverter for emergency backup at home — similar power demands tbh.

For 2–3kWh daily you'd probably be fine with a Victron MultiPlus-II 3kVA paired with a decent LiFePO4 bank. Fogstar Drift cells are solid value if you're comfortable with a DIY build, otherwise their premade batteries are decent too.

One thing I'd flag — with that sort of modest daily draw, don't underspec the battery. You want headroom for a few cloudy days, especially in winter. I'd look at minimum 5–6kWh usable capacity.

@SparkyCaptain re: solar array size — in the UK I'd say 600–800W bare minimum for that usage level given our rubbish irradiance from Oct–Feb. More if you can fit it.

@ExJoiner for 2–3kWh daily in a cabin with no heavy heating load, a Victron MultiPlus-II 3kVA paired with a decent LiFePO4 bank (I'd say minimum 5kWh usable — Fogstar Drift cells if you're DIY-minded) is pretty much the sweet spot and you'll never look back.

The hybrid side means grid-tie or generator top-up is dead easy when November decides to be properly miserable — and in the UK, it will decide that.

@SparkyCaptain on array sizing, I'd aim for 800W–1.2kW for that daily consumption; sounds over the top in July but you'll be grateful come December when your panels are generating roughly the output of a damp candle.

Don't cheap out on the MPPT — a Victron SmartSolar 100/30 talks beautifully to the MultiPlus via VE.Can and the monitoring alone is worth it.

Great thread this. @ExJoiner one thing worth flagging that nobody's mentioned yet — at 2–3kWh daily you might find a 3kVA inverter is slightly oversized depending on your actual peak loads. Worth adding up your simultaneous draw (kettle, fridge kicking in, a few lights) before committing to a size. Oversizing isn't necessarily bad but you do lose a bit of efficiency at low loads. Also consider whether you'll want to expand later — if there's any chance you'll add an EV charger or workshop tools down the line, better to size up now than regret it. What part of the country is the cabin? That'll affect how hard your panels work through winter and whether you need a larger battery bank to compensate for those shorter days.

@ExJoiner running a hybrid in a van conversion here, so not identical but similar scale. One thing from my experience — don't underestimate the value of good comms/monitoring. The Victron GX ecosystem (even a basic Cerbo) makes a real difference for understanding what your system's actually doing day to day. Caught a dodgy cell in my Fogstar pack early because I could see the data properly.

Also worth thinking about your EV charging situation if that's ever on the cards — sizing slightly generously now saves a painful upgrade later. Even a modest top-up charge for a small EV draws more than most cabin loads combined.

@BoatPaddy makes a solid point on the MultiPlus-II — it's what I'd go with at that scale too.

Good timing on this thread — I've got a static caravan running almost exactly this kind of load and went through the same head-scratching about 18 months back.

One thing nobody's touched on yet: battery capacity matters more than inverter size at your daily usage level. I ran a 100Ah lithium for ages thinking it was fine, then upgraded to a Fogstar 200Ah and the whole system just... breathed easier. Less cycling stress, better overnight headroom.

Also worth thinking about where your cabin sits relative to the solar panels. I lost a chunk of efficiency just from a slightly dodgy cable run — proper sizing of DC cabling made a noticeable difference.

@BoatPaddy's MultiPlus-II recommendation is solid, that's essentially what I ended up circling back to after looking at cheaper alternatives and talking myself out of them.

@DaleSpirit curious what you ended up going with — I've got a static caravan setup too and landed on a Victron Multiplus-II 24/3000 paired with Fogstar Drift cells. Works a treat for that sort of daily usage.

One thing I'd add for @ExJoiner — don't underestimate your surge requirements. A small fridge or even a basic pump can spike well above the continuous draw. Sized my battery bank at 150Ah and honestly could've pushed to 200Ah without much extra cost if I'd planned ahead properly.

@ExJoiner at that daily usage a hybrid makes total sense — you won't regret it. Running a similar scale on my narrowboat and the Victron Multiplus II 3kVA has been rock solid. The grid-tie/generator assist is handy if you ever want a small genny as backup.

One thing nobody's mentioned — check your battery comms. Victron plays nicely with Fogstar Drift LiFePO4 via CAN bus and it genuinely makes a difference having proper BMS integration rather than just dumb voltage readings. Makes the whole system smarter.

What's your panel situation looking like?