I have a 12v 60AH battery with a 200w inverter with my 36v charger connected to inverter to charge my 36v battery WHILE I'm using the bike/battery...
It effectively doubles my range.... (15ah battery turns basically into a 30Ah battery)...
Or from 540wh into 1080wh (540wh extra)...
So with 12v 60ah battery I get an extra 540wh...
Figure using that equation...
20ah 12v will get you 180wh worth of battery
40ah = 360wh
If you use the battery for other stuff at the same time, figure even less.
What kind of 12v battery are you thinking of using?
EDIT: I JUST noticed that you said 10amp... You meant 10 amp-HOUR battery..
If you used that and JUST for the inverter setup and nothing else, figure you'll get 114wh extra (12v*9.5ah-leaving .5ah for safety sake) and then with inefficiencies of the conversion/inversion process of 80% you're looking at an extra 91.2wh (114wh*.8) or 2.5ah at 36v. (Or an extra 5 miles, give or take).
Last edited by Sangesf; 01-09-12 at 07:16 PM.