How to use a hoist to lift photovoltaic panels

Release one side of the bag's sling from the hoistlet it fall to the ground flat.Carry the panel vertically onto the bag until it rests against the side attached to the hoist.Lift up the unattached side and re-fit to the hoist hookRe-secure the side strapsGood to Go! [pdf]
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Largest vertical axis wind turbine

A 2021 study simulated a VAWT configuration that allowed VAWTs to beat a comparable HAWT installation by 15%. An 11,500-hour simulation demonstrated the increased efficiency, in part by using a grid formation. One effect is to avoid downstream turbulence stemming from grid-arranged HAWTs that lowers efficiency. Other optimizations included array angle, rotation direction, turbine spacing, and number of rotors. [pdf]
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