- #1
duhuhu
- 59
- 2
Hey all!
Today I took my car to the shop for some starter issues. They told me that the starter had been damaged by a battery with a higher CCA rating than was safe for the starter motor and it burned out my motor slowly over time. I feel like they may be BS'ing me, but I'm not sure.
I know my battery is ~12V. The one I had installed was rated to 880CCA and they recommend 330CCA for my car. From some research my starter motor has an impedance of about .02-.04 ohms, and car batteries should be around the same. So that gives me a total impedance of about .06 ohms. Taking V=IR I should be able to pull a maximum of about 200 Amps on startup. I assume that a higher CCA battery has lower resistance, so let's just take that out of the picture entirely. Assuming a maximum current draw for my starter, the most I should possibly see is about 400Amps which is not too far above the 330CCA recommended for my car. I would imagine that they would design the starter to be able to handle at least 400 for short periods of time (I.E. the 2 seconds it takes to start my car).
I would like to know if anyone else has any experience or insight with this issue. I'm definitely getting the starter replaced because it's straight up dead, but I would rather not get a new battery if I don't have to.
Thanks!
Today I took my car to the shop for some starter issues. They told me that the starter had been damaged by a battery with a higher CCA rating than was safe for the starter motor and it burned out my motor slowly over time. I feel like they may be BS'ing me, but I'm not sure.
I know my battery is ~12V. The one I had installed was rated to 880CCA and they recommend 330CCA for my car. From some research my starter motor has an impedance of about .02-.04 ohms, and car batteries should be around the same. So that gives me a total impedance of about .06 ohms. Taking V=IR I should be able to pull a maximum of about 200 Amps on startup. I assume that a higher CCA battery has lower resistance, so let's just take that out of the picture entirely. Assuming a maximum current draw for my starter, the most I should possibly see is about 400Amps which is not too far above the 330CCA recommended for my car. I would imagine that they would design the starter to be able to handle at least 400 for short periods of time (I.E. the 2 seconds it takes to start my car).
I would like to know if anyone else has any experience or insight with this issue. I'm definitely getting the starter replaced because it's straight up dead, but I would rather not get a new battery if I don't have to.
Thanks!