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Old 06-20-2018, 01:48 PM   #101 (permalink)
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Valid question. When I ran alternatorless in my Firefly, it worked fine on reduced voltage. Though I didn't do it at night (dim headlights).

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Old 06-20-2018, 04:26 PM   #102 (permalink)
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He has batteries of different chemistries and voltages. 7V drone batteries or 48v scooter batteries maybe.

I think he also wants to keep the car as stock as possibble. So he is running alternatorless BUT from the perspective of the car, the function of the alternator is performed by the auxiliary batts.

He will not experience any voltage sag either.


If my car proves to automatically switch off the alternator if the batterie has 15-16v, then i may do the same with supercaps instead of the cars batterie.

Last edited by teoman; 06-20-2018 at 04:41 PM..
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Old 06-21-2018, 12:45 AM   #103 (permalink)
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Quote:
Originally Posted by California98Civic View Post
I understand the measurements. (Impressive ad hoc set up, too, McGyver.) Thanks for the demonstration snaps. But I don't understand your need for stepped voltage in order to run without an alternator. What's that about? I am not criticizing... I actually do not understand the need you describe! Lol.
Stable voltage, portable battery pack, use a(different voltage) battery I already have rather than something purpose built (Read:$$), not buy a heavy deep-cycle battery, efficiency/reliability over using a resistor, able to carry more than one battery, and all to avoid draining the main battery and getting stranded. Take your pick?
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Old 06-21-2018, 09:05 AM   #104 (permalink)
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Systems like the fuel pump and ignition coils are happier with closer to 14V than with only 12 (or whatever the voltage is on the battery)... car runs better and gives better FE than otherwise
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Old 07-02-2018, 01:08 PM   #105 (permalink)
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Tried it out, finally, now that I'm back to being the sole driver. Disconnected the alt, plugged in the pack and went on my merry way.

The good:
Engine noticeably peppier, especially at light loads. Made her feel a lot lighter. Got to work and back with no issue.

The bad:
The main battery ran out of juice on the way to work the second day, the pack overloaded the 15A accessory fuse, and she died on me. Didn't have what I needed to get her started again, had to call for a jump-start. D'oh!!

I'll revisit this, either when I get the rest of my LEDs, or when I have back-ups installed.

The couple of drives I got out of it were very encouraging.
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Old 01-07-2019, 12:58 PM   #106 (permalink)
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Blackfly - '98 Geo Metro
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Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 51.13 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.21 mpg (US)
Thanks: 2,592
Thanked 5,513 Times in 2,825 Posts
Any updates? Overall happiness with the car / fuel economy after coming up to one year of ownership?


(I ask because this thread was one of the top 25 most popular of 2018. Compiling the list now...)

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Ecodriving test:
Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L



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