just mowed the lawn with my homegrown 22" elec string mower. it didn't miss a beat. if i'm doing this right, i figure it drew between 5 and 10 amps @120v. that = about 600w - 1200w. it takes an hour plus ..... so @$.16 per kwh., it cost between $.12 and $.19. my gas mower would have used from 1/2 to 1 gal. for that time of operation .... so $2 - $4.
http://i262.photobucket.com/albums/i...-080626-P1.jpg
times 52 wks per year. ......
if the mower system proves reliable, i'll switch it to inverted battery power like the tractor.