Solar panels are not that heavy. We designed our roof to take...

Solar panels are not that heavy. We designed our roof to take the load. It is less than for a hot water system.

Tile roof can be a problem as the more people you have up there trundling around, the more likely a tile will crack. PLus the solar panels need to be mounted which means tiles have to be moved and often cut.

There is more risk of your panels blowing off the roof.

Solar panels do fail and if you want to make a claim under warranty, you need to purchase from a company that is still going to around in 10 years time.