Victron Orion 30A vs 18A — worth the extra for a static van?

Running a 200Ah Fogstar Drift LiFePO4 in my static caravan. Currently charging it via a 30A Victron MPPT from roof panels, but shore power's not always available and the leisure battery drops overnight if I'm running the 12V fridge. Thinking a DC-DC charger off the site hook-up car socket (or a small dedicated feed) could give it a top-up boost when solar's being rubbish — which, let's be honest, is half of winter in the UK.

Looking at the Victron Orion-Tr Smart range. The 12/12-18A is about £120, the 30A version jumps to around £180. That's a decent difference for something that's essentially a trickle topper rather than my primary charge source. Static van doesn't move obviously, so I'd be wiring it permanently rather than just clipping crocodile leads to a tow vehicle.

Has anyone got the 30A version in a similar setup? The 18A would push roughly 216W which seems plenty to offset overnight fridge draw (mine's pulling about 4-5A), but I'm wondering if there's a real-world reason to go bigger that I'm not seeing on paper.

Also — does the isolated version matter here if I'm not connecting to a vehicle alternator? Both batteries share the same negative bus in my setup.

LutonLife | 📍 Bedfordshire | ⚡ Off-grid since 2019

@FormerMechanic for a static van the 30A Orion makes more sense to me, especially with a 200Ah Drift. The 18A will get the job done eventually but you're looking at noticeably longer charge times when the solar's been struggling — those overcast UK stretches can leave your bank properly depleted.

The price difference isn't enormous, and the 30A will stress your Fogstar less by spending less time in partial states of charge. That Drift is a cracking battery and deserves feeding properly!

One thing worth confirming — is your tow vehicle's alternator rated to handle the 30A draw comfortably? Shouldn't be an issue for most modern setups but worth a quick check before committing.

CamperJackie | 📍 Array | ⚡ Emergency backup & EV charging enthusiast

So here's the thing — I had almost exactly this dilemma last year with my static setup! I went 30A and honestly the difference in real-world charge recovery time is significant.

The bit nobody really talks about: if you're also planning to add EV charging to your system down the line (I did, total rabbit hole 😅), that extra headroom from the 30A means your leisure battery recovers properly between sessions rather than limping along.

One thing worth checking — the Orion-Tr Smart version specifically, because the Bluetooth monitoring via VictronConnect has genuinely saved me from a couple of nasty surprises with my Fogstar Drift.

The price difference between 18A and 30A is what, £40-50? Over the lifespan of the unit it's basically nothing.

BreezyDrifter | 📍 Array | ⚡ Narrowboat

On the boat I ran the 18A for ages — fine when the engine's ticking over regularly but you really notice it if you're not running much. Switched to the 30A and the difference was proper noticeable, especially topping up a LiFePO4 which takes bulk current well.

For a static van where you're not moving the alternator load around, the 30A just gives you more buffer. Shore power goes down, you want that charger recovering your bank as fast as sensibly possible.

Price gap between the two isn't massive either — think it was about £40 when I last looked. Spread that over the lifespan of a Victron unit and it's nothing really.

Go 30A, you won't regret it.

BreezyCaptain | 📍 Yorkshire | ⚡ Solar + DC-DC hybrid setup

@FormerMachanic one thing worth considering that nobody's mentioned yet — with a static van you're likely running longer cable runs than a mobile build, so voltage drop becomes more of a factor. The 30A unit gives you a bit of headroom to absorb those losses and still deliver a meaningful charge rate. The 18A can end up feeling quite sluggish once you account for a marginal drop across a longer run. Also, if you're ever planning to expand that battery bank — Fogstar Drift cells are addictive, as many of us know — you'll thank yourself for having the bigger charger already in place. The price difference between the two really isn't dramatic enough to justify undersizing it for a permanent installation in my opinion.

ShaunKelly87 | 📍 West Midlands | ⚡ Solar + LiFePO4 van build

Worth adding — since it's static, your alternator runtime is probably limited to occasional moves rather than regular driving, so charge opportunity per session matters more than it might on a touring setup. That 12A difference between the two units adds up surprisingly quickly; over a typical 45-minute drive you're looking at roughly 9Ah extra from the 30A. On a 200Ah Drift that's not nothing, especially heading into winter when your MPPT contribution drops off.

The 30A also gives you headroom if you ever expand your battery bank — which seems to happen to everyone eventually! Price difference between the two isn't massive when you're already spending serious money on Victron kit anyway.

I'd go 30A without much hesitation in your situation.

Roger1983 | 📍 Lancashire | ⚡ Off-grid cabin + LiFePO4

@FormerMechanic — for a static van I'd lean towards the 30A, mainly because you're not worrying about cable runs to a moving alternator, so the slightly higher install cost is a one-time thing. The extra charging headroom matters more than people think when you're relying on it to top up between poor solar days in winter. That said, the 18A will absolutely work — it's more a question of how quickly you want recovery after a run of cloudy days. With 200Ah of Drift (brilliant battery btw), the 30A will get you back to a comfortable state of charge noticeably faster. If budget's tight the 18A won't let you down, but I wouldn't call the 30A overkill here.