Posted by mdurki (vaughan@…>)
I have wondered about this, and I’ll bet one of you will know the
answer.
Assume a factory set up. How long would it take at, say, 2000 rpm, to
replace the draw on the engine battery cause by a normal start?
Jim
Posted by svfantasy@… (svfantasy@…>)
Jim,
Its all about amp hours. If your starter motor draws (just to keep it simple) 10 amps and it took one hour ( I know ridiculous) to start, you would have taken 10 amp hours from the battery. To replace this loss depends on the charging source. If you had a 10 amp alternator, you would have to run your engine for one hour to replace the 10 amp hours.
So, because your engine probably starts witin a few seconds you can see by using the example above, it would not take more than a very few minutes to bring the battery back to where it was. Do the math using your alternator size, starter motor amp draw, and time it takes to start.
But, it all depends on so many variables. The charge state of the battery, because your alternator may not put out all of its power when the battery is fully charged, battery temp, age of the battery etc etc.
Jay