Random photo thread — your views today

Brilliant shot that. The low angle really makes those crystals pop — reminds me of the ice buildup on my solar panels this time of year, absolute nightmare to shift but looks proper beautiful before you have to get the squeegee out.

Polytunnel frost is different though, isn't it? You get that greenhouse effect working in reverse at night. Mine always gets a similar coating, especially if there's been clear skies and no wind. Thing is, once the sun hits it properly, the whole lot melts within an hour and you've got condensation dripping everywhere.

Do you find it affects your growing much? I've been thinking about getting one sorted for spring veg, but worried about the thermal mass needed to keep things from getting properly frost-damaged when it gets really cold.

Ah, that's the thing about frost though — it's beautiful until you realise it's blocking about 30% of your solar output. I've got panels on the cabin roof and come January, mornings like that are proper frustrating. The crystalline buildup on the glass is gorgeous to look at, sure, but it's a reminder that winter's when you need every watt.

@BirchLover's spot on about the ice on panels. I've taken to angling mine more steeply over the colder months, helps the frost slide off faster when it warms up mid-morning. Also rigged up a small heated mat on one section — runs off the battery bank when needed, though it's a bit of a luxury I'll admit.

The polytunnel though, @GemmaCooper86 — that's where you want to see it. Protects the plants, looks magical, and you're not relying on it to charge your batteries. Your frost patterns probably mean you've got decent insulation happening underneath. That's the silver lining to those crystalline bits.

Yeah, @RustyTinker's hit the nail on it there. Beautiful to look at but absolutely brutal for output. I've got mine angled pretty steeply on the cabin roof specifically to try and shed frost faster, but you still get mornings where they're completely plastered.

The trick I've found is positioning your panels where morning sun hits them first — even a bit of weak winter sun shifts frost surprisingly quick. Also keeps the angle steep enough that anything melting slides off rather than pooling. Though obviously not everyone's got the luxury of choosing where they go.

Tempered glass helps too, frost doesn't stick quite as aggressively as it does on rougher surfaces. Fogstar panels seem to shed it a touch better than my older Renogy ones, though might just be the angle difference.

@GemmaCooper86's shot is genuinely lovely mind you — just wouldn't want that on my array in December!

Spot-on about the output hit, @RustyTinker. I've been tracking this closely on the narrowboat setup over the past few winters — frost can tank your generation by 40-50% depending on panel angle and ambient temperature. The real kicker is that passive thaw takes ages; even weak winter sun struggles to shift it properly.

Learned the hard way that a shallow angle (say 15-20 degrees) actually helps slightly — frost slides off quicker once there's any thermal activity. My fixed 35-degree installation was a nightmare until I added a small tilt-frame with manual adjustment. Sounds daft but rotating to 20 degrees for frost season made a tangible difference.

The polytunnel's probably worse because it's not generating anything anyway — just looks gorgeous while utterly trapping heat loss underneath. If @GemmaCooper86's got plants in there, that crystalline coverage is actually doing them a favour insulation-wise, even if it looks precarious.

Have you considered any brush or heating solutions, or just accepting the winter dip as part of the off-grid reality?

Interesting point about the output loss. I've been dealing with this on both my home setup and the boat — the frost itself isn't actually the killer, it's the shading from ice buildup on the panels that causes the real damage.

What I've found works better than anything else is tilting the panels steeper in winter. Mine are at about 50° from November onwards, which helps frost slide off naturally rather than sitting there. You lose a bit of angle efficiency but gain so much more from avoiding the blockage.

Has anyone tried those hydrophobic coatings? I've been eyeing up some products but they're not cheap and I'm not convinced they're worth it for UK weather. The frost keeps coming back anyway.

@Boycie25 — have you noticed if your angle on the narrowboat makes a difference? I'd imagine the motion of the water might help shed it faster than a static installation?

The real fix would be heating elements on the frame but that defeats the purpose of off-grid efficiency, doesn't it?

Got a similar setup here with the shepherd's hut and it's maddening, isn't it? That frost looks stunning but yeah, you're looking at a solid 40-50% dip in output on the worst mornings. The crystalline buildup's worse than you'd think because it's not just blocking light—it creates this micro-shadow effect across the whole panel.

What's caught me out is the timing. I usually wait until around 10am when the angle of the sun shifts enough to melt it naturally rather than manually clearing it. Seems counterintuitive but the panels often heat up enough by then without me having to risk damaging the surface or wasting battery doing a manual clean.

The one thing I'd say differently from the narrowboat crowd—if you've got any tilt adjustment on your rig, even a slight increase in angle helps shed the frost quicker. Mine's at about 35° most of the winter and I've noticed a real difference versus the fixed installations around here.

That polytunnel frost is genuinely beautiful though. Bit of a silver lining situation!

Lovely photo @GemmaCooper86. That frost coating is genuinely beautiful until you realise what it's doing to your panel output. I've got a similar issue with my static caravan setup — south-facing array takes a proper hammering this time of year.

The crystalline buildup is deceptive because it's not just surface ice; it creates this microscopically rough texture that scatters light rather than allowing it through. I've measured it before with my Victron monitoring — sometimes you're looking at 60-70% output loss depending on density and angle of the panels.

Few things worth considering if it's bothering you: tilting angle matters (steeper arrays shed frost faster), and some folk swear by hydrophobic coatings, though they're temperamental in UK conditions. I've found the most pragmatic approach is accepting the winter hit and just letting the sun do its work mid-morning when it warms up enough. Actively clearing with a brush risks micro-scratches on tempered glass.

What's your array tilt set at? If it's shallow (say, 20°), you might see improvement bumping it ste

That's a beautiful shot, though I'd wager you're losing a decent chunk of output beneath all that crystalline loveliness. I've got a similar problem with the van conversion setup parked up in winter — the panels get absolutely hammered by frost, and it's worst on those perfectly clear, still mornings when you'd think you'd be generating the most.

The thing that's helped me is angling the array a bit more steeply for winter months. Sounds obvious, but it actually does shift some of the frost off naturally as the sun climbs. Doesn't solve it entirely, but better than watching your Victron controller show next to nothing for hours.

@SomersetVanLifer, do you find the shepherd's hut's roof angle helps at all with shedding it quicker? I've been toying with adding a small heating element around the edges of my panels, though that defeats the object of off-grid efficiency really.

The polytunnel frost is genuinely stunning though — that part of your setup's probably thriving with it.

Lovely capture, @GemmaCooper86! The light on those ice crystals is genuinely striking.

Bit of a double-edged sword though, as @FormerMechanic14 and @AndyButler have mentioned. If you've got panels under that polytunnel or nearby, you're definitely taking a hit on generation – frost can block a surprising amount of the available light. Worth checking your inverter readings on mornings like this to see just how much you're losing.

That said, if you can get out there safely for a gentle brush-off (soft hand or squeegee rather than anything abrasive), it usually clears pretty quickly once the sun gets going. Some folk swear by a thin angle on their mounting to let gravity do the work, though that's easier said than done with existing setups.

How's your off-grid situation looking otherwise? If you've got decent battery reserve, these frosty mornings are more of an aesthetic annoyance than a real problem. But worth keeping an eye on if you're running tight on reserves heading into deeper winter.

Yeah, that's the trade-off isn't it. Frost looks stunning but plays absolute havoc with output. I've got panels on the cabin roof and heavy frost mornings mean I'm basically running on battery reserves until the sun burns it off around midday.

The annoying bit is you can't really shift it safely without risking panel damage. Soft brush works sometimes but honestly I just let nature sort it. Lost a fair bit of winter generation to it though – might look into mounting at a steeper angle next time for better self-clearing, though that's not always practical depending on your setup.

@FormerMechanic14 's got the right idea flagging it. Pretty to photograph but brutal on the winter months when you need every watt.

Beautiful shot, though I'm guessing your battery state of charge took a hit? Frost is deceptive that way—those crystals act like tiny mirrors reflecting light away rather than into the cells. I've had mornings where my Victron monitoring showed 40% output loss. The polytunnel's actually brilliant insulation though, so you're probably managing better than most. Worth checking your tilt angle come winter—steeper panels shed frost quicker.

Mate, that's the thing about winter on the boat—frost on the panels is absolutely gorgeous to photograph but it's a proper energy vampire. I've learned the hard way that a soft brush and some patience beats any amount of waiting for the sun to do it naturally. Those crystals are beautiful until your battery monitor starts screaming at you.

Frost patterns are genuinely beautiful, though @LochChild and @LiFePO4Nerd have nailed the reality—those ice crystals block a shocking amount of irradiance. I've had mornings where my Victron MPPT barely registers 20W from a 4kW array. Worth keeping a soft brush handy; even gentle clearing without scratching the glass makes a substantial difference to winter generation.

That frost is stunning, but yeah—I've had mornings where my array's been completely blanked out by the stuff. The real killer is when it melts and refreezes as ice. Had to angle my panels differently last winter to get better morning sun exposure. Worth the effort though, beats losing half the day's charge waiting for it to clear naturally.

Beautiful capture! The frost does look spectacular in that winter light. It's that bittersweet thing though, isn't it—those crystalline patterns mean you're losing generation for hours while they melt. I've found a south-facing tilt helps shed it quicker than a flat array. Do you get much winter sun where you are once the frost clears?