by hiddencache on 9/5/21, 4:08 AM with 1 comments
by theamk on 9/5/21, 4:33 AM
(For comparison, a dozen of alkaline D-cells provide about 200 Wh as well and can last several years. Or if you can install solar panels, they'll provide 140,000Wh/year to 280,000Wh/year per square meter -- but you'll need some evegy storage for the night)