How much is your recharge running on your home elec. bill?

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Is it always different with every set up, 15 batteris compared to 20 batteries?  I would think that the charger would come into play somewhere. 

Dont think in terms of battery think in terms of cells.  A bigger battery is like a bigger line of credit.  You can "borrow" more amps from battery but like the line of credit you gotta pay it back.  The more borrowed the bigger the interest and for the battery you also have an interest (so to speak) of about 30% that you dont get back - at least that is what I found charging submarine battery.

The charger is nothing but a converter (which is the technical term) more power out = more power in plus a little loss - maybe around 5%.

The variation Electruc mentioned between recharges as measured by the meter divided by miles driven is not a result of the battery or charger BUT in the driving habits, route, traffic pattern etc.  If he can do 40 miles at a steady 30 mph on flat ground his power per mile value will be real high.  If he is stuck in stop n go then it will be real low.  If he climbed Queen Anne that day real low.

Dan Bentler