Anyone else running a Victron MultiPlus in a tiny house — what size did you go for?

Just trying to nail down which MultiPlus to go for in my tiny house build. I'm looking at either the MultiPlus-II 24/3000 or pushing up to the 24/5000, and honestly I'm going back and forth on it. The 3000VA feels like it should be enough for a induction hob, small washing machine, and general loads — but I keep reading horror stories about people wishing they'd just gone bigger from the start.

My battery bank is shaping up to be around 200Ah at 24V using Fogstar Drift cells, and I've got 600W of solar on the roof. The plan is to be mostly off-grid but with occasional hook-up when parked on a site. Nothing too wild, but I don't want to be babysitting loads constantly either.

Has anyone actually tripped a MultiPlus mid-cycle on something like a washing machine? I've seen the surge ratings and they look fine on paper, but real-world experience is a different thing, isn't it?

Also curious whether anyone's paired theirs with a Cerbo GX for monitoring — is it genuinely worth the extra outlay, or does the Color Control GX do the same job for less?

ThistlePaul | 📍 Scottish Borders | ⚡ Victron + LiFePO4

@JakeCrane the question I'd ask yourself is: do you have any high-draw appliances that stack? A kettle alone is fine on the 3000, but if your kettle, microwave, and a power tool kick in simultaneously you'll hit that ceiling fast.

I went 24/3000 in my setup and genuinely don't regret it — the vast majority of tiny house loads are well within that range. The 5000 does give you headroom, but you're also paying more and the efficiency curve is slightly less favourable at lower loads, which matters when you're running off solar day-to-day.

Worth checking your actual peak surge requirements rather than just continuous draw. What's your biggest single appliance?

TransitProject | 📍 North Wales | ⚡ Victron MultiPlus-II 24/3000 + LiFePO4

@JakeCrane I went with the 3000 in my van conversion and honestly it's been more than enough — but a tiny house is a different beast depending on your cooking setup. The thing that pushed people I know toward the 5000 was having an induction hob. Those can spike hard on startup even at lower wattage settings. Worth checking the surge rating too, not just continuous — the 3000 handles 6000W surge which catches people out as being better than expected. What's your battery bank sitting at? With 24V you're already limiting yourself somewhat versus 48V for higher loads. If budget allows I'd genuinely consider jumping to a 48V system and the MultiPlus-II 48/3000 — you'll thank yourself later.

Nessa | 📍 Array | ⚡ Victron + Fogstar LiFePO4

@JakeCrane welcome to the forum — tiny house builds are brilliant to follow along with.

One thing worth factoring in that I haven't seen mentioned yet: power factor on inductive loads. The 3000's 2400W continuous rating looks fine on paper, but motors (pumps, fridges, washing machines) can pull 2–3× their rated wattage at startup. I run a MultiPlus-II 48/3000 in my static caravan setup and it handles everything comfortably, but I deliberately sized up from my calculated peak draw by roughly 30%.

If you're ever considering EV charging down the line — even a small portable EVSE — the 5000 becomes far more compelling. The headroom genuinely matters.

Also check Victron's PowerAssist feature; it lets you set a grid/shore input current limit and the inverter tops up the difference, which could influence your sizing decision significantly.