Anyone else had their static caravan solar setup wiped out by a single bad winter storm?

Last November a proper nasty Atlantic low came through and I lost the lot — two of my four 200W Renogy panels just lifted off the roof like they were nothing. The other two survived but the wiring to them was absolutely shredded. Three months of careful installation, gone in about forty minutes.

I've since rebuilt with a much more aggressive mounting approach — doubled the number of fixings, used M8 stainless bolts straight through the roof rail rather than the clip-on brackets Renogy supply. Feeding into a Victron SmartSolar 100/30 and a pair of Fogstar Drift 100Ah lithiums in the back bedroom cupboard. The system itself is solid, but I'm now genuinely paranoid about the next big blow coming through.

So the question is really: what wind speeds are we actually engineering for on a static caravan roof? The park I'm on is just outside Kendal so we're not exactly in a sheltered spot. Is there a standard anyone works to, or is it just a case of "bolt it down harder and hope"? Has anyone had a structural survey done specifically for panel loading?

@MoreTeaVicar ouch, that's brutal. Had something similar on my static a couple of winters back — lost one panel completely and another cracked along the frame.

What saved the others was switching from the standard Z-brackets to proper through-bolted aluminium tilt frames with a lower profile. Less wind resistance and they're not going anywhere.

Few things worth doing before next winter:

• Torque-check every fixing before October
• Self-amalgamating tape on every cable entry point — storm water ingress finished my MPPT that same night
• Consider lower tilt angles (20° rather than 35°) during winter months — less lift

The wiring loom is actually what catches most people out. Once the panel lifts it yanks the MC4s and you can arc. Check your DC isolator is still sound after any storm event.

@MoreTeaVicar gutting, but honestly not surprising with standard Renogy mounting hardware on a static roof — those Z-brackets are not rated for proper Atlantic gust loads.

On my static I went full overkill: through-bolted every panel with backing plates inside the roof void, then ran a bead of Sikaflex 512 around each mount. Not going anywhere short of the whole roof lifting off.

Few things worth checking before you rebuild:

• Wind zone for your site (UK has zones 1-4, coastal sites often need engineer-specified fixings)
• Whether your caravan park has rules about penetrating fixings — some insist on adhesive-only which is... suboptimal
• Cable entry grommets sealed properly, water ingress kills more systems than wind does

What mounting system were you using originally? Betting it was just the supplied clips tightened down on the roof rail.

@MoreTeaVicar I've been through two proper Scots winters with panels on my cabin roof and the difference between surviving and not is entirely down to the mounting hardware — not the panels themselves.

Ditched the standard Renogy rail clips after year one. Switched to through-bolted aluminium extrusion with stainless M8 fixings torqued properly, then ran a bead of Sikaflex round every penetration. Nothing has shifted since, even when we had gusts the Met Office clocked at 84mph up here.

The wiring is the other killer. MC4 connectors left exposed to standing water eventually fail or arc. Run everything in conduit with a proper drip loop before it enters the structure.

Painful lesson to learn, but a lost panel teaches you what a thousand forum posts don't.