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Is a 220A alternator enough?


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Car, 69 Chevelle

 

I believe the OEM alternator is 36A since it's the non-A/C model.

 

I'm installing a Kicker CXA 1200.1 (150A fuse) and a Kicker CXA 360.4 (50A fuse)

 

I'm not wanting to install a second battery, will this work? The current battery is an Optima red top

 

 

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The red top is a 50 amp hour battery. 

Lets assume your 4 channel amp is using 35 amps at your louder listening volume and your sub amp is pulling 125 amps. So thats 155 amps. Then assume the car is using 30 amps for accessories and such. You would be fine with a 220 amp alternator. 

 

The red top would give you a bit of reserve capacity at idle, or if you are listening with the vehicle off briefly (10 minutes or so). 

 

Keep in mind that the alternator wont put out 220 amps at idle so I wouldnt sit in the parking lot idling while at full tilt for more than 30 minutes.

 

You can also put a voltage monitor in. 

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