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Old 01-03-2012, 22:52   #1
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High Amp Alternator Wire Gauge

Dear brains trust

I just Replaced my regular amp with a high amp one (95amp).

The old wire to the battery is 8wg. Do I need to replace it with a higher gauge?

Apologies if this is a basic question
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Old 01-03-2012, 23:02   #2
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Re: High amp alternator wire gauge

How long is the run from the alternator to the battery bank return distance

better be really short for 8
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Old 02-03-2012, 00:27   #3
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Re: High amp alternator wire gauge

I would replace with a fresh larger gauge wire,that way its one less item to worry about.

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Originally Posted by cutlass View Post
Dear brains trust

I just Replaced my regular amp with a high amp one (95amp).

The old wire to the battery is 8wg. Do I need to replace it with a higher gauge?

Apologies if this is a basic question
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Old 02-03-2012, 01:01   #4
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I will thanks!
This one is only 2m but ive also got to do the other engine which will be 9m
What gauge should I use?
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Old 02-03-2012, 01:18   #5
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Re: High Amp Alternator Wire Gauge

Minimum is #6 to protect the wire and should also be ok for voltage drop (<3%) for 2M. To get the same 3% drop you'll need to go with #1 for 9M at max amperage. If the banks are being charged at the same time then I would go with the bigger wire to keep the charging voltage at each bank close.
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Old 02-03-2012, 01:50   #6
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Re: High Amp Alternator Wire Gauge

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Originally Posted by mikefossl View Post
Minimum is #6 to protect the wire and should also be ok for voltage drop (<3%) for 2M. To get the same 3% drop you'll need to go with #1 for 9M at max amperage. If the banks are being charged at the same time then I would go with the bigger wire to keep the charging voltage at each bank close.
Sorry, I should have said #0 for the 9M run. Here's a table to help:

http://bluesea.com/files/resources/r...010_Rev002.pdf
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Old 02-03-2012, 09:44   #7
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Re: High Amp Alternator Wire Gauge

You need to upgrade the wire in any case, but how much is a function of several things.

Are the cables in a conduit or in free air?

Are your alternators externally or internally regulated?

What is the 9m run used for--to regularly charge depleted house banks or only occasionally?
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