David see earlier post and thread elsewhere in this Forum. http://forum.oceancruisingclub.org/generating-electricity/424-wind-solar-water-diesel-what-s-the-best-mix?start=12
Simon

Does anyone have practical experience of these? See www.wattandsea.com.

I have seen 50ft+ boats that swear by them saying it provides ALL their power needs at sea and others who have had great difficulty mounting them securely experiencing problems with security of the attachment.

If it can be securely mounted it seems like a no brainier.