Be aware that the risk of fire increases with roof-mounted solar panels. Also be aware of effects on homeowners insurance policies.
You put some modern panels on your roof that absorb power from the sun that now no longer gets absorbed by your roof - so your roof is now a little cooler. A wooden roof is now actually less of a fire risk and a tiled roof will now absorb and radiate less heat - bonus!
I live in the UK. We build from sticks n bricks. We've had a bit of a heat wave recently that concentrates the mind somewhat. My office (I'm the MD) has a vast expanse of red brick double skinned which is south facing. My desk environment is around 10C warmer than the external temperature (I have a lot of sensors deployed). I have now decreed that when my desk temp is 30C then we abandon ship and work from home.
I'm going to investigate skimming the red brickwork with a white render. My parent's house is a modern build and that seems to help.
Oh, fire risk? What on earth are you on about? Insurance risk? What are you on about?
Adding a whole bunch of electrical equipment (that's exposed to the elements, wildlife, etc.) absolutely increases the risk of fire. Panels are heavy as well, so you're increasing the load on the roof, could increase risk of collapse (especially in areas that get lots of snow). Plus, if you don't notify your insurance company, it's at best not going to cover replacement cost of panels if something goes wrong and at worst invalidate your whole policy.
I trained as a Civ Eng in Plymouth (the British one). I now own an IT company. I have a fair idea about fire risk (I'm our fire officer too) and how some materials behave in general and under loads and incident (eg fire).
In my opinion, roof mounted solar panels have very few risks in the UK. The likeliest risk is wind related. We are seeing increasingly strong gusts - virtually nothing compared to tornados but this is a land that does not have tornadoes (yet).
We need to consider surviving Beaufort force 12 as a minimum standard.
Easily said but ... don't
Properly installed? Sure, no or minimal risk.
But insurance companies deal in aggregate, which includes improperly installed panels.
My understanding is that the legislation actually requires the working environment be cooler than that, so I get the sentiment, and ironically probably many of your employees' homes will be hotter, but I think you've set the bar too high.
I am the H&S bod, and shortly I'll be first aid accredited (again). Mind you I've done first aid for sailing and skiing back in the day too, so I know what you are supposed to do when hit by an avalanche ("swim" and pray, or soil yourself and pray - which is more likely) and how to treat or at least mitigate hypothermia.
For some reason we have had loads of practice in working from home recently. I'm an expert in VPNs and all my staff have home phones virtually wired up to our PBX.
The other 75% of solar energy heats up the panels themselves I guess and/or is reflected.
The stats showed that the rooftop isolation switches shorting out was the leading cause of fires. We no longer fit them.
"More than 90% of inspected rooftops had significant safety and fire risks. Here’s how to protect your solar asset."
Lots of bad wiring. Get a 3rd party inspector.
May be best to watch the inspector do the inspection?
"Citation?", "[Citation]", "Citation Needed" - these all bother me when the research is literally just copy/paste/search.
[1] https://guides.lib.uw.edu/research/citations/citationwhat
More electrical systems in your house means more risk of fire.