On Monday, 25 November 2019 19:19:47 UTC, Bill Wright wrote:
How about if I mount a magnetron on a big satellite dish and point it at
a sealed container of water bolted onto the gate? The water boils,
powers a little Mamod steam engine that turns a dynamo which charges the
battery. Simples.

Wouldn't a small illegal immigrant to power the dynamo be cheaper?

Owain