Anyone else finding their garden office battery barely lasts through a cloudy week in winter?

Three cloudy days in January and my Victron BMV is basically writing its will. 😅

Honestly though, after years of running a narrowboat through British winters, I've learned that anyone who specs a garden office battery for average UK weather is absolutely kidding themselves — you need to plan for a fortnight of grey soup with occasional drizzle as the highlight.

A few things that actually helped me:

• Upsized to a Fogstar Drift 200Ah LiFePO4 — the capacity headroom makes a shocking difference when your panels are producing 40W on a good day
• Ruthless load audit — that little electric radiator is the silent killer, sorted mine with a 12V electric blanket instead (don't judge me)
• Secondary input — even a small hook-up from a mains feed on the absolute worst weeks saves your cycle count from absolutely cratering

The real villain nobody talks about is self-consumption from the inverter sat there doing nothing at 2am — my Victron Multiplus was quietly munching away like a labrador near an unattended cheese board.

What's everyone actually running capacity-wise? And has anyone gone the route of a small wind turbine to complement the panels through winter? Feels like the obvious answer but I've yet to find one that doesn't sound like a washing machine full of spanners when it gets going.

Would love to know if anyone's cracked this properly or if we're all just collectively pretending our setups are fine whilst nervously watching the state-of-charge drop.

@WonkyHermit ha, the BMV reading 12% at 8am is a special kind of dread isn't it 😅

Exactly the same issue with my setup last February. Ended up just doubling my battery bank — got a second Fogstar Drift 200Ah and honestly it transformed winter resilience. Still not invincible against a proper grey UK week but much more breathing room.

Also worth looking at your loads more ruthlessly. I knocked my garden office draw right down by switching to a 12v laptop charger and LED panel heater timer. Shaved maybe 30-40% off daily consumption which buys you another day or two easy.

What's your current bank size? And are you running any backup grid tie-in or purely off-grid? Sometimes a small grid fallback just for the kettle and heating makes the whole thing way more practical in Jan/Feb.

@WonkyHermit running a shepherd's hut off-grid here and winter is genuinely brutal for solar. My fix was adding a decent chunk of LiFePO4 (went with Fogstar Drift cells) — the usable capacity vs lead acid is night and day when you're actually drawing it down in anger.

Also worth looking at your loads more critically. I trimmed standby draws I didn't even realise were there and bought back maybe 15% capacity essentially for free.

The other thing nobody mentions — tilt angle. My panels are way steeper in winter now and it makes a measurable difference on those low-sun days when every watt counts.

@WonkyHermit my Fogstar Drift 200Ah in the garden office laughed at three cloudy days... then January actually arrived and it stopped laughing entirely. 😂

Ended up chucking a small Renogy 40A DC-DC charger on the car feed as a "just in case" — now my garden office is essentially parasiting off the driveway like a technological vampire. 🧛

Honestly though, the real lesson from my cabin and the garden office is that you never spec enough battery for a British winter — whatever number you land on, double it, weep at the cost, then double it again.

@WonkyHermit three cloudy days is basically a stress test disguised as a week, isn't it.

My cabin setup went through exactly this last January — had what I thought was adequate capacity until a proper grey fortnight arrived and humbled me completely. The BMV went from "helpful monitor" to "instrument of psychological torture" rather quickly.

What sorted it for me was adding a small mains trickle charger as emergency backup — not glamorous, not pure off-grid, but the alternative is sitting in the dark pretending that's somehow noble.

Also genuinely worth reconsidering your loads. I cut out a surprising amount of phantom draw I'd completely forgotten about. Old router, a tiny LED strip left on — it all adds up when your panels are producing approximately nothing for a fortnight.

@SolarNut that Fogstar comment is sending me 😅 January really does have a personality, doesn't it.