Thread: Warm air intake
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Old 05-11-2017, 07:57 PM   #93 (permalink)
oldtamiyaphile
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Quote:
Originally Posted by Magician View Post
yep... I read up on the lead acid batteries. If I roll start and avoid using the starter, I don't hardly use any of the capacity... The starter is an energy monster! Even having my LED headlights and LED running lights with the car running doesn't use all that much on a 10-20 minute drive. However, I figure it's best to leave my alternator switched on during any night driving or possibly on days that have very little sunlight.
Do the maths.

Worst case the starter draws 80A (peak- it drops rapidly once the engine is spinning). A small car battery has about 80Ah of capacity.

It takes 1 second to start a warm engine, occasionally longer, occasionally shorter.

Let's say you want to use only 20% of the batteries capacity, that's 16Ah.

80/3600=0.023

So it takes 0.023Ah to start your engine, 16Ah is enough for 700 starts!

In the real world I was able to start a Suzuki four times on a 90mah supercap, which would tend to confim my maths.
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