Though as noted above, the correct linear or parabolic mirror concentrator makes tracking adjustment a once per day task, which will be less demanding to maintain.

And the Zenith Solar system linked to above by a swedish kind of death turns the necessity for cooling from a maintenance cost into an advantage by providing both electricity and process heat from the same unit.

I've been accused of being a Marxist, yet while Harpo's my favourite, it's Groucho I'm always quoting. Odd, that.