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Old 07-28-2008, 02:38 PM   #9 (permalink)
MetroMPG
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,699

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 53.56 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 66.29 mpg (US)
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Quote:
Originally Posted by Hankinator View Post
If you monitor your batt voltage when you see it getting low you could flip the switch and engage your alt. again.
You may actually get worse gas mileage doing this than if you simply leave the alternator connected full-time.

Considering alternators are not very efficient to start with, you'd be throwing away gasoline in the conversion losses. The alternator would be working extra hard to simultaneously (1) provide the vehicle's power needs and (2) replace the energy in the battery.

If you're going to run without an alternator to save fuel, it needs to be grid/solar charged, or carefully set up to deliver current when braking or in engine over run conditions.
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