02-25-2020, 01:02 PM
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#12
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Senior Member
Join Date: Jun 2015
Location: Red Deer, Alberta
Posts: 5,082
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Re: I wish I would have waited
Quote:
Originally Posted by 30 Closed Cab PU
Correct the below if I am wrong.
The math
Assume the starter draws 40 amps at 6 volts (probably not correct but used for comparison of 6v vs. 12v)
6V: R (Resistance) = Volts (E)/Current (I), 6/40 = .15 ohms
W (Power Watts) = I x E, 6 x 40 = 240 Watts
12V: R does not change, same starter as above = .15 ohms
I = E/R, 12/.15 = 80 amps
P = I x E, 80 x 12 = 960 Watts
So when going from 6 Volts to 12 volts using the same starter, Current doubles and Power quadruples
Running a 6 V starter under load continuously like a motor at 12 Volts would destroy the starter . Since it is only used intermittently for a few seconds, it does not heat up dangerously and is allowed to cool off even at 12 Volts.
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You got it!!
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