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Old 19-06-2009, 09:14   #1
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Cable Length for Inverter?

I am installing a new Outback inverter. Outback says no more than 10ft of 4/0 cable.

Where I want to put the inverter would be closer to 15ft. I have an alternate location but would prefer the longer one.

Is 10ft the end limit, or am I ok with the longer run?

Thanks.
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Old 19-06-2009, 09:35   #2
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I believe if you go to 2/o cable you will be fine
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Old 19-06-2009, 10:01   #3
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For 3% Voltage Drop, at 12VDC nominal:
A 4/0 Cu cable is suitable for about 690 Amps at 10 feet total cable length (Positive + Negative).
At 15 feet total length, it's suitable for about 460 Amps.
At 15 foot distance, hence 30 feet total cable length (15' Pos + 15' Neg), it's good for about 230 Amps.
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Old 19-06-2009, 10:36   #4
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Quote:
Originally Posted by GordMay View Post
For 3% Voltage Drop, at 12VDC nominal:
A 4/0 Cu cable is suitable for about 690 Amps at 10 feet total cable length (Positive + Negative).
At 15 feet total length, it's suitable for about 460 Amps.
At 15 foot distance, hence 30 feet total cable length (15' Pos + 15' Neg), it's good for about 230 Amps.
I should have mentioned that I have a 24v system (550amps @24v).

Thanks.
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Old 19-06-2009, 11:40   #5
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#4/0 cable loaded to 550 Amps at 24VDC is good for 25 Feet of Cable (2 runs @ 12.5')

For more information, and pre-calculated wire sizing charts, see also:

Wire Size Chart.1
http://www.cruisersforum.com/gallery...r&imageuser=79

Wire Size Chart.2
http://www.cruisersforum.com/gallery...r&imageuser=79

And ➥ "Ohm's Law & Boats"
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