Sterling B2B 60A vs Victron Orion-Tr Smart 30A — worth the price gap for a static van install?

Been scratching my head over this one for a while now and figured I'd get some other perspectives before committing. Running a 200Ah LiFePO4 bank (Fogstar Drift cells, DIY 4S build) in my static caravan, and the van has a 110Ah AGM starter battery kept topped up via hook-up most of the time. Want to add a DC-DC charger so I can grab some charge from the car when we tow the van to a new pitch or just after a long drive in.

The Sterling Pro Batt Ultra B2B 60A comes in around £220-240 depending where you look, whereas the Victron Orion-Tr Smart 30A (non-isolated) is sitting at roughly £130-150. Obvious difference is the 60A vs 30A output, but given my use case — topping up after towing, maybe 45-60 minutes of charging time — I'm genuinely not sure the extra current justifies the price. At 14.6V charging a LiFePO4, even 30A is giving me a solid 438W into the bank.

Main concern is the Victron's non-isolated version — the van chassis and car chassis will be temporarily bonded during towing anyway, so isolation shouldn't be critical here, but I've read conflicting things about ground loops causing grief on certain setups. Anyone actually experienced issues with the non-isolated unit in a tow-vehicle-to-caravan scenario specifically?

Also curious whether the Victron's Bluetooth/VictronConnect integration is genuinely useful day-to-day or just a nice-to-have. My MPPT and inverter-charger are both Victron already so there's an argument for keeping the ecosystem tidy, but not at any cost.

Hey @CliveBaker! For a static install I'd lean toward the Victron Orion-Tr Smart 30A personally. Yes it's pricier, but the Bluetooth monitoring and VE.Smart networking is genuinely brilliant when you've got a LiFePO4 bank — you can fine-tune absorption and float to suit your Fogstar cells properly rather than using generic profiles. The Sterling is solid kit don't get me wrong, but its configurability is more limited.

That said, 30A might be the sticking point depending on your alternator and how quickly you need to top up. What's your typical daily consumption looking like? If you're regularly pulling the bank down significantly, the Sterling's higher current might actually matter more than the fancy monitoring.

Also worth checking whether your vehicle's alternator is smart/variable voltage — that changes things considerably! 🙂

@CliveBaker one thing neither reply has touched on yet — with a static install you're likely running longer cable runs than a typical van setup. At 30A the Orion-Tr will demand heavier cabling to keep voltage drop acceptable, whereas the Sterling's 60A output means your charge time is halved, potentially allowing thinner gauge wire over the same run length whilst maintaining equivalent power delivery. Worth modelling that in your cable sizing calculations before assuming the Victron's lower current draw is simpler to wire.

Also worth noting: the Sterling B2B has a solid track record in the narrowboat community specifically because it handles the rough input voltage fluctuations from older alternators without complaint. If your tow vehicle or generator output is at all marginal, that robustness matters.

The Victron's VE.Direct integration is genuinely useful if you're already in the Victron ecosystem, but for a standalone install the Sterling arguably represents better value per amp.

Good point from @RiverRunner on cable runs — worth adding that the Orion-Tr Smart has that non-isolated option too which can help with certain earthing setups in static vans.

One thing I'd throw in from my own motorhome experience: the Victron app integration is genuinely useful if you're already running a Cerbo GX or even just monitoring via Bluetooth. Being able to see charge history and tweak absorption/float remotely saved me a proper head-scratch last winter when my LiFePO4 wasn't pulling charge properly.

For a static install where it's more "set and forget" emergency backup rather than daily driving cycles, do you actually need 60A? What's your alternator situation and what's the primary charging source? Might be that 30A is perfectly adequate and the Sterling is slightly overkill unless you've got a serious capacity mismatch to deal with.

Hey @CliveBaker, good shout asking before buying. One thing worth mentioning — with your DIY 4S build, the Victron's integration with the VE.Smart network is genuinely useful if you're already running (or planning) any other Victron kit. The Orion can receive battery temperature and voltage data from a SmartShunt or BMV, meaning charge curves actually adapt to real conditions rather than just guessing. For a static van where the charger might be ticking away unattended for days, that extra intelligence gives real peace of mind with LiFePO4. The Sterling is a solid bit of kit, don't get me wrong, but that ecosystem benefit often justifies the price gap on its own. What else have you got installed already?

Something @Rob1968 and the others haven't explicitly flagged — with a static van install, the 60A Sterling starts making more financial sense purely on charge time. Your 200Ah bank sitting at 50% needs 100Ah back; the Orion-Tr at 30A is taking well over three hours versus roughly 90 minutes with the Sterling. If you're spending weekends on site rather than touring, that quicker recovery window could genuinely matter when the alternator's your primary source. That said, the Victron's Bluetooth monitoring integrates beautifully if you're already running other Victron kit — the ecosystem argument is real. What's the rest of your setup like? If you've got a Cerbo GX or similar, the integration alone might justify the Orion despite the lower output.

Just to add something nobody's touched on yet — have you considered your alternator's health under sustained load? The Sterling B2B's built-in current limiting is genuinely useful here, letting you dial back if you're worried about cooking an older alternator during long static periods. With a static van you're presumably not racking up engine hours, so charge sessions may be infrequent but potentially quite long. The Victron's Bluetooth integration is lovely for monitoring, granted, but if your alternator's not in its first flush of youth, that Sterling flexibility could save you a headache down the line.

Just to add something nobody's picked up on yet — have you checked what your alternator can actually sustain, @CliveBaker? A lot of people fit a 60A B2B and then wonder why their alternator runs hot or cuts out prematurely. Even on a static install you'll likely be running the engine periodically to charge, and pushing 60A continuously off a modest alternator isn't always wise. The Sterling does let you dial back the output current, which helps, but it's worth knowing your vehicle's alternator rating before deciding whether that extra headroom from the 60A unit is genuinely useful or just theoretical. If you're only doing short engine runs anyway, the Victron's 30A over a longer period might actually suit your usage better than you'd think.