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Here's some information on the subject from Gray Maguire of Project90x2030 who says...
Check out the attached from earthpower and BWG hydro, it'll tell you most of what you need to know. If you want to build it yourself then earthpower is the way to go, if you want a pro to do it go with Bruno from BWG (https://www.linkedin.com/pub/bruno-w-graber-bwg-hydro/14/300/B06). He know's his stuff.
Earth Power Energy Solutions, Kalk Bay 7990, South Africa, Tel: (021) 702 1102 Fax: 9021) 701 2877 E-mail: info[at]earthpower.co.za Website: https://www.earthpower.co.za/