[loeg]

GP isn't talking about a full day's use, but "free electricity for an hour or two each day (or even each week)."

[testing22321]

The whole reason to spend the money on the battery is so you can use the free power for a lot longer than an hour or two!

[jay_kyburz]

You'll want to draw as much power as possible while its free, and use it duing peak times.