Simple solar generator setup for small off-grid cabin

Been down this rabbit hole myself when I kitted out my wee cabin up near Loch Tay a couple of years back. Started with the mindset of keeping it simple, ended up learning more about battery chemistry than I ever expected.

What worked brilliantly for us was a 200W Renogy panel feeding into a Victron SmartSolar MPPT — even the modest 75/15 model — paired with a 100Ah Fogstar Drift LiFePO4. That combination handles lighting, a 12V compressor fridge, and phone/laptop charging without any drama. The Victron app over Bluetooth is genuinely satisfying to watch on a rainy afternoon when you've nothing better to do.

A few things I'd flag for anyone starting out:

• Don't underestimate your cable runs. Voltage drop caught me out badly on the first version of my setup.
• Fuse everything close to the source. Sounds obvious until it isn't.
• A small inverter for occasional 240V stuff (a drill, kettle in a pinch) is worth having, but size it sensibly — it's where most people overbuy.

The cabin is only used weekends and the odd week, so I didn't need massive capacity. But I know folk with similar setups who've bolted on a second panel and extra battery when their habits changed.

Curious what others are running in their cabins — particularly whether anyone's gone down the all-in-one route with something like an EcoFlow or Jackery rather than building a proper fixed system. I've always been sceptical but happy to be convinced otherwise.

@LochWalker that rabbit hole is very real — I went in wanting a basic setup for my garden office and came out the other side knowing more about peukert exponents than any sane person should.

One thing worth flagging for anyone reading this thread fresh: don't underestimate your actual loads before sizing anything. I ran a clamp meter on my office circuit for a week before buying a single panel, and my "small" load turned out to be nearly double what I'd estimated on paper.

For a cabin context specifically, I'd strongly recommend Victron's MPPT SmartSolar range even at the smaller sizes — the Bluetooth logging alone saves enormous headaches when you're troubleshooting remotely. Pair with Fogstar Drift LiFePO4 cells if budget is tight and you're sorted for a solid, expandable foundation.

Great thread this. @LochWalker the "keep it simple" intention is noble but rarely survives first contact with a battery datasheet!

One thing worth flagging for anyone just starting out — don't underestimate the value of a decent battery monitor from day one. I ran my first setup for months just guessing at state of charge, which is a brilliant way to accidentally abuse your batteries. A Victron BMV or even a cheap Renogy shunt monitor transforms how you understand your system and helps you size everything properly when you inevitably want to expand.

@WheresMeWires curious what you ended up settling on for your garden office — did you go lithium or stick with AGM? I've seen both work well for smaller loads but the calculus changes quite a bit depending on how often the setup sits unused over winter.

@LochWalker "keep it simple" is just the universe's way of making sure you end up with a Victron Cerbo GX, a Fogstar 280Ah lithium, and a spreadsheet titled "final_setup_ACTUAL_v7_DEFINITIVE_this_one.xlsx" 🔋

For the cabin specifically

@SIE_Electric that Cerbo GX comment hit close to home — my boat build started with "just a couple of panels and a leisure battery" and somehow concluded with a full Victron ecosystem, a Fogstar Drift 200Ah LiFePO4, and a spreadsheet tracking state of charge going back eighteen months.

The funny thing is, the complexity doesn't sneak up on you all at once. It arrives in stages, each one feeling completely reasonable at the time. Just add a battery monitor. Just upgrade the MPPT. Just wire in a second bank.

@LochWalker — what panels did you end up running up at the cabin? Scottish light levels mean you're often sizing for winter rather than summer, which changes the whole calculation considerably.

@CallumHobbs the boat-to-Cerbo pipeline is basically universal at this point.

For the cabin use-case specifically, one thing worth flagging that gets overlooked: cold temperature charging cutoff on LiFePO4. Up near Loch Tay you'll see sub-zero nights regularly, and most BMS units will hard-block charging below 0°C to protect the cells. If your charge controller doesn't have low-temp compensation or you're not running self-heating cells, you can wake up to a completely isolated battery that's taken zero solar all morning despite clear skies.

Ran into this exact situation with my van during a February trip through the Cairngorms — Fogstar Drift cell, Victron SmartSolar, everything looked fine on the app but the BMS had locked out charging for six hours.

For emergency backup applications especially, that silent failure mode is genuinely dangerous. Worth sorting before you need the system rather than during.