Anyone else running a Victron MultiPlus on a static van? What size did you go for?

Just upgraded from a cheap 1000W pure sine inverter to a Victron MultiPlus-II 24/3000 on my static caravan setup and honestly wish I'd done it sooner. The PowerAssist feature alone has been worth it — shore power here is limited to about 16A and it tops up from the batteries when I run the kettle and microwave at the same time. No more tripped breakers.

Running 200Ah of Fogstar Drift 24V LiFePO4 to go with it, charged via a Renogy 400W panel array on the roof. The integration with Venus OS / Cerbo GX gives me proper monitoring which I was missing before. Setup wasn't too bad but the AC wiring side took me a weekend to feel confident about.

Curious what sizes others have gone for in similar setups — static vans, shepherd's huts, tiny houses etc. Did you find 3000W enough or wish you'd gone bigger? Also wondering if anyone's using the MultiPlus Compact to save space — is it worth the compromise on output?

@BirchLover that PowerAssist revelation is real — I went through exactly the same moment on my static when I first plugged in the kettle and the microwave at the same time without tripping anything. Felt like magic.

I'm running a MultiPlus-II 48/5000 on mine, mainly because I wanted headroom for the garden office annexe I added last summer. Overkill for most people, but once you start adding circuits you'll be glad of the capacity.

One thing worth mentioning — get VE.Configure set up properly before you assume everything's running optimally. Mine was throttling the charge current for weeks before I sorted the settings. The difference in how quickly my Fogstar cells topped up afterwards was noticeable.

Have you integrated it with a Cerbo GX yet? That's the next rabbit hole waiting for you...

Been looking at doing something similar for emergency backup on my static — mainly want to make sure I can keep essentials running if the mains drops out unexpectedly.

Quick question for anyone who's done this: did you go 24V or 48V system? I've seen the MultiPlus-II in both configurations and I'm struggling to work out which makes more sense for a backup-first setup where it won't be in heavy daily use.

Also wondering whether the 2x120 would be sufficient or if I'd regret not going for the 3000. The static isn't huge but I'd want the kettle and fridge covered at minimum.

@BirchLover what battery setup are you running alongside it — Fogstar or something else? Budget is always a consideration here.

Great thread! I'm running a MultiPlus-II 2x120V 24/3000 on my static up in the Dales and it's been rock solid for about 18 months now. @Clive1978 for emergency backup it's genuinely brilliant — mine seamlessly transfers to battery within 20ms when the hook-up trips, so the fridge and router don't even notice. One thing I'd flag is to make sure your 24V battery bank is properly sized before you lean on that 3000W output — I learned that the hard way running a kettle and microwave simultaneously! Also worth connecting it to VRM via the GX device if you haven't already @BirchLover, the monitoring data is incredibly useful for spotting patterns in your consumption. What battery chemistry are you both running? I switched to LiFePO4 last spring and the difference in usable capacity has been a game changer.

Great thread, @BirchLover! I've been running a MultiPlus-II 24/3000 on my static for about 18 months now and couldn't be happier with it. One thing worth mentioning for @Clive1978 — if backup is your primary concern, the transfer switch response time is incredibly fast (around 20ms), so even sensitive electronics barely notice when it switches over from mains. Definitely worth configuring the ESS assistant properly from the start though, took me a bit of fiddling through VictronConnect before I had everything behaving exactly as I wanted. Also make sure your 24V battery bank is properly sized — I initially underestimated this and the inverter would occasionally complain under heavy loads. Happy to share my config if it helps anyone.

@Keith1981 the 2x120V model in the Dales — mate, that's a US-spec unit, hope you've got some creative wiring going on up there 🤨

Running a MultiPlus-II 24/5000 on my static for emergency backup and the PowerAssist is the only reason my kettle and electric blanket haven't caused a domestic incident when the grid dips. Sized up from the 3000 specifically because I refused to compromise on the immersion heater during a outage — pedantic? Yes. Correct? Also yes.

One thing nobody's mentioned: don't cheap out on the battery comms cable to your BMS. Fogstar Drift cells with proper VE.Bus integration is night and day versus just hoping for the best.

Ha, @ForestDaz makes a fair point there @Keith1981 — the 2x120V is very much the wrong side of the pond! Hopefully that's just a typo and you've actually got the standard 230V unit.

Anyway, great thread @BirchLover. I'm running the MultiPlus-II 48/3000 on my static down in Somerset — went with 48V because I had a decent-sized LiFePO4 bank already and wanted to keep cable runs manageable. PowerAssist is brilliant when the site's hook-up is a bit weedy, especially in summer when everyone's running their air con simultaneously.

One thing I'd flag for anyone sizing up — don't underestimate the value of going slightly bigger than you think you need. That headroom makes life considerably easier.

Running a MultiPlus-II 24/3000 on the narrowboat and honestly considering mirroring the same setup in the van conversion I'm working on 😅

@Keith1981 yeah definitely double-check that unit — UK grid is 230V single phase so you want the correct spec or you'll have a bad time. Victron's site is pretty clear on which models are which, worth a look before you go any further.

One thing I'll say about the 3000VA — pairs beautifully with a decent Fogstar battery bank. Really came into its own when I wanted to run the induction hob without constantly watching the state of charge.

@Keith1981 mate if that 2x120V unit is real I genuinely want to know which parallel universe Screwfix you found it in 😂

Running a MultiPlus-II 12/3000 in the motorhome with a Fogstar Drift lithium bank and the PowerAssist is basically witchcraft — hook it up to a campsite's weedy 6A bollard and watch it just quietly get on with life while running the kettle. @IvyLes narrowboat to van conversion is a solid combo, just mind your 24V vs 12V system voltage before copy-pasting the setup.

Great thread — been running a MultiPlus-II 48/3000 on my static for about 18 months now and couldn't be happier. Went 48V specifically for the efficiency gains and thinner cable runs, which made the installation considerably tidier. The VE.Bus integration with my MPPT and Cerbo GX means I can monitor everything remotely, which is brilliant when you're not on site.

@BirchLover curious what you're running on the input side — shore power only or have you got solar feeding in too? The PowerAssist really shines when you've got a limited shore connection to work with. What battery chemistry are you on?