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Ive been giving this some thought as well. (another potential commercial MPG related product)
A battery bank and charger that replaces the alternator.
Assuming 10% savings, its still a bit expensive
Here is how I did the math
Added up all the accessories wattages from another post (Thanks OP)
Assumed all the ones that could be on, were, for 10 hours straight.
I believe I came up with 66a continuous (meaning one would need 66 watt hours to replace with a battery)
so something that could survive a 10 hour day would be 660ah x 12v
Using Lithium Iron Phosphate batteries that comes to 2880 just for the batteries and weighs 172 pounds.
Assuming once the charger and cord went in and the installation box (and a few bucks for profit) were looking at like 4k
If one were to be bought brand new for a new car, it would last somewhere around 350,000 miles. Assuming the car lasted 150,000 of those with the original owner, heres what he or she could save:
150,000 miles
average of 35mpg
assuming $4 for fuel (likely more over time)
They will buy 4285.71 gallons ($17,142) without the device.
Or Buy 3896.10 gallons (15,584) with the device
fuel savings of 1558 (even if they drove out the entire lifespan of the batteries, using the same assumptions they would only save 3960)
So unless I was way off with my math a "commercially feasable" (Moron proof) would be unfeasable.
No for someone taking short trips, like a shorter commute, game on! :-)
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