Quote:
Originally Posted by DragBean
My goal here is not to get into arguments with people.
But if it makes little black ducky happy I changed the what I said to running the entire "electronics of the" car instead of entire car.
As far as the battery goes, the draw off the alternator onto a fresh fully charged battery is still going to be at least amp. May only amount to 1/20th to 1/10th of a hp in electrical power (that you're gaining all the time), but shedding the type of load plus 20 lbs of weight (more importantly giving me more engine bay space) is a plus I'll take.
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Not arguing, just answering what you put forward. You would be seriously better off using a lithium ion battery to save the weight - they cost far less, have 20-50 times the energy per kilogram and charge controllers are off the shelf.
Self discharge of a lead acid battery is in the order of 5% per month. Based on a 100AH battery, this amounts to about 0.2AH per day, or about 15mA. This is based on maintaining and not over charging the battery. In comparison, a lithium ion battery is between 1-2% and a supercapacitor is about 40-50%.
I doubt that you would ever be able to measure the fuel economy change due to this in real life situations. The actual drain from the alternator is piffling compared to the drag of the belt drive.
Simon
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