Re:Well? (Score 1)

It all depends on the power requirements of the tool shed. If all you have is a single 100W light with a pull switch your requirements are much lower than if you've mounted your sprinkler timers in the shed and these have to be plugged in somewhere, 24/7.

Size your panel(s) appropriately to the expected peak and normal, "nominal" demand. You'll lose about 30% of the power converting from AC to DC so if you can run the light/appliance off DC you're better off. If you're charging batteries you'll need a voltage regulator to prevent the batteries from being overcharged (and hence explode). If you want to tie into the grid instead there a special controller that you have to use to ensure the power generated is compatible with the local utility and rquires permits from the power company; that's outside the scope of a DIY project and you should consult a licensed contractor.