Swapped out the old Victron on my narrowboat – worth every penny or am I just easily impressed?

Not on a narrowboat myself but swapped out an ageing PWM controller for a Victron SmartSolar on my cabin setup last spring and the difference was immediately obvious. Yield went up noticeably and being able to see everything through the VictronConnect app is genuinely useful rather than just a gimmick.

The MPPT algorithm on theirs just seems to work — especially on cloudy days where the old unit was basically giving up. Worth noting if you're pairing it with lithium (I've got Fogstar Drift cells), the charge profile control is much tighter which matters more than people realise.

Few things I'd ask:

• Which model did you go to? The SmartSolar 100/30 or something bigger?
• Are you running lithium or AGM on the boat?
• Did you notice much difference in the app connectivity when you're away from the vessel?

The "easily impressed" question is fair though — Victron stuff does carry a premium and I sometimes wonder if half the appeal is just how polished the ecosystem feels compared to cheaper alternatives. That said, I've not had a single issue since fitting mine, which on an off-grid setup is worth a lot on its own.

Interested to hear what your previous unit was and what prompted the swap. Always useful to have real-world comparisons rather than spec sheet comparisons.

@LochChild curious what panels you're running and what your array orientation looks like — the MPPT advantage really compounds when you've got any shading or suboptimal angles going on.

On my boat I've got a couple of 175W panels flat-mounted on the cabin roof (not ideal, I know), and switching to a Victron SmartSolar 100/30 probably recovered an extra 15-20% yield just from the MPPT algorithm handling the low-angle morning light properly. PWM simply can't do that — it's just brute-forcing the voltage down.

The VictronConnect Bluetooth monitoring is what sealed it for me though. Being able to see exactly what the panels are doing throughout the day, graphed out on your phone, means you actually understand your system rather than just hoping for the best. Worth the premium over cheaper MPPT units purely for that visibility.

@LochChild great first post — welcome to the forum! The SmartSolar is a brilliant bit of kit, and you'll keep discovering features as you go.

One thing worth doing if you haven't already: connect it via Bluetooth to the VictronConnect app and dig into the history graphs. You can really see what your array is doing across the day, spot shading issues, and compare yield day-to-day.

On my narrowboat setup I found the absorption/float charge curves made a massive difference to battery longevity once I'd tuned them properly for my Fogstar Drift LiFePO4 cells. Worth checking your charge algorithm matches your battery chemistry if you haven't already.

What battery bank are you running? That'll shape what you can realistically squeeze out of the upgrade.

@LochChild living on a narrowboat myself so I can confirm — the SmartSolar basically laughed at my old PWM controller and sent it to the bin where it belonged. The Bluetooth app alone is worth the upgrade just to smugly watch your yield graphs while pretending to be busy. One thing nobody mentions: the load output terminals are handy for automating a bilge pump relay, which on a narrowboat is less "nice feature" and more "sleeping soundly at night." Keep an eye on the VRM portal too — once you've got logging set up you'll spend an embarrassing amount of time staring at charge curves instead of actually going anywhere.

@LochChild same experience on my static setup — swapped PWM for a Victron SmartSolar MPPT 100/30 and the Bluetooth monitoring alone was worth it tbh. Spend way too much time staring at the VictronConnect app watching the watts tick up on a sunny morning 😅

One thing nobody mentioned yet — the SmartSolar really earns its keep on overcast days. That's where MPPT genuinely pulls ahead, squeezing every last watt out of low light. UK winters would be pretty grim without it.

@ForestBoater panel orientation makes a massive difference to that comparison too, good shout. My array isn't ideal angle-wise and I reckon I'd have seen even bigger gains if it was.

Running Fogstar lithium cells here and the two play nicely together once you get the charge profile dialled in properly.

Switched from PWM to MPPT on my van build three years ago and the yield difference in a UK winter — where you're basically harvesting cloud-filtered suggestions of sunlight — is genuinely the only reason my Fogstar lithiums aren't perpetually sulking at 40%.