Mine are out rain and snow, from 80-100 F in the summer to -45f in the winter. They take a beating from the elements 365 days a year.
That’s why they don’t last very long. Nothing does.
Hey, I hear you NZ. Sounds like yours work harder for a living than mine. Mine are in a salt water environment though, but most always sunny (Los Angeles). But my needs are minimal and at sea I am happy for anything they can do for me.
Beats the hell out of running the diesel. I am going to add a Air-X 400W Windgen shortly. That should make things better in them low sun times, like at night.
Regards