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Old 06-04-2019, 07:42 AM   #1
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Wire size - Inverter To AC Panel

Ok. I have a blue seas ac panel. From that I have Ancor 12/3 stranded and tinned wire running to outlets and appliances. I am planning to use a 10/3 extension cord to go from my inverter to the panel. Is this ok? What is best? Thanks in advance!IMG_1192.jpg
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Old 06-04-2019, 08:09 AM   #2
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We used 8/3 but are only using the black, neutral and ground right now. The red is in reserve in case we upgrade our shore power and 110v box later on.
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Old 06-04-2019, 09:17 AM   #3
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What is the capacity of the inverter?
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Old 06-04-2019, 11:11 AM   #4
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My inverter is 3000w. This is way more than I need. I just know my better half will find a way to use electric cooktop and washer etc at the same time and call me when Iím fishing .

I just figure if 12ga is normal then the main line will have to be bigger?
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Old 06-04-2019, 11:43 AM   #5
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Just to preface this; I have never wired a bus. Iíve chased wires in a commercially built RV and got a taste of the laughably poor workmanship that goes into them. Iíve also engineered and rewired an entire house, so take my advice as you will. In other words, Iím not a licensed electrician, but I do have some experience with AC current installations.

You will want to consult an NEC code book.

The wire you use is a function of the circuitís intended maximum ampacity, the type of wire insulation, the size of the raceway, the number of conductors in the raceway, and the ambient temperature.

Iím doing this based on NEC table 310.15(B)(16)
That I found on the Internet, so youíll want to confirm based on current code.

So assuming you are using non-metallic (AKA Romex)

And assuming 3000 W @ 120 V = 25 A + 20% (donít exceed more than 80% of ampacity) = 30 A

And ambient temperature not exceeding 90 degrees C

And assuming number of conductors is 2 or 3

The wire size would be 10 gauge

http://marketing3.southwire.com/PubImg/2534e3165836463ea44839d9ef6cd5e0.pdf
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Old 06-04-2019, 11:52 AM   #6
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We are running a 3000w inverter as well with 4, 20 amp double breakers. We also think it's a little oversized for our initial needs. I had a friend (cert electrician) help me connect the inverter, batteries and breaker box and he told me to use the 8/3 wire.
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Old 06-04-2019, 12:09 PM   #7
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Quote:
Originally Posted by Danjo View Post
Just to preface this; I have never wired a bus. Iíve chased wires in a commercially built RV and got a taste of the laughably poor workmanship that goes into them. Iíve also engineered and rewired an entire house, so take my advice as you will. In other words, Iím not a licensed electrician, but I do have some experience with AC current installations.

You will want to consult an NEC code book.

The wire you use is a function of the circuitís intended maximum ampacity, the type of wire insulation, the size of the raceway, the number of conductors in the raceway, and the ambient temperature.

Iím doing this based on NEC table 310.15(B)(16)
That I found on the Internet, so youíll want to confirm based on current code.

So assuming you are using non-metallic (AKA Romex)

And assuming 3000 W @ 120 V = 25 A + 20% (donít exceed more than 80% of ampacity) = 30 A

And ambient temperature not exceeding 90 degrees C

And assuming number of conductors is 2 or 3

The wire size would be 10 gauge

http://marketing3.southwire.com/PubI...d9ef6cd5e0.pdf
Well said!
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Old 06-04-2019, 12:35 PM   #8
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Ditto what Danjo said. Both the NEC and your inverter manufacturers documentation are good places to seek out the answer to your question. What other people did, with other equipment (right or wrong) is irrelevant. There's no 'normal'... it's entirely dependent on your max amp draw, fusing (to prevent that from being exceeded), environment, length of wire run, and wire type/insulation.
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Old 06-04-2019, 06:08 PM   #9
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Thanks All !!
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