Indeed, photovoltaic panels can be installed in the Rain, and they're certainly made to be water-resistant. Some specific reasons and elements add to their capability to withstand stormy conditions and stay functional.
[PDF Version]
Use this MIL-STD-810 test method to evaluate material likely to be exposed to the rain, water spray or dripping water during storage, transit or operation.
[PDF Version]
Energy storage cabinet ip66 rain test Test duration: at least 15 minutes: Water volume: 12. 5 litres per minute: Pressure: 30 kPa at distance of 3 m: IP66 Enclosures: Able to protect against powerful water.
[PDF Version]
If solar panels become frozen, immediately check for ice or snow accumulation. Remove any obstructive elements gently to restore sunlight exposure whenever safe to do so.
[PDF Version]