So I googled solar Kings......and for those who are not familiar with them...taken from their website......
Easy Installation and Superior Performance
The SolarKing Exhaust Fan can be self-installed or you can use one of our approved installers to do the job for you. The unit just required 1 roof tile to be removed for installation or for metal roof’s just a 300mm opening.
The brushless DC motor makes the operation quiet and assures the motor will have long life. Being brushless it is also far more efficient compared to other motors so the performance is better.
I like the idea of them.
There is a wired version option for plug in 240V mains power used for night time.
48 and 56V panels are available. Good luck.
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heritagestonemason.com/Fordlouisvillerestoration
In order that the labour of centuries past may not be in vain during the centuries to come...... D. Diderot 1752