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Old 02-04-2015, 01:20 PM   #1
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Battery Wire Gauge

Looking to increase my battery capacity and am wondering about battery wire. My 2014 FC 25FB has 6 gauge wire. I know a thicker gauge is desirable for a host of reasons even with the OEM Interstates but is it necessary? Trojan recommends specific gauges based on Ah. I assume they use conservative recommendations. I just want my batteries to last longer. I do not see my load changing. Does that mean my 6 gauge wire remains both adequate and safe? Assuming no other appliances are added such as a toaster etc. I assume the 6 gauge be adequate even if someone runs the 1000 watt inverter given you can do that now with the OEM configuration. In short increasing battery capacity has no impact on my maximum draw, correct? If I do decide to upgrade the wire how difficult is it to pull? Thanks all.
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Old 02-04-2015, 01:33 PM   #2
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If you load is unchanged you don't need to change the wire size.

Pulling wire is a major project and in your case not necessary .

Now IF you were to add a major load it should have its own circuit starting at the battery.
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Old 02-05-2015, 02:08 PM   #3
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1000 watt inverter will typically draw 90 amps when there is a 1000 watt load connected to it.

That's marginal for 6 gauge though it may work fine if the distances are relatively short (several feet) and the cable is exposed enough that it can cool. It will also work fine if you don't connect 1000 watt loads to your inverter, because the inverter will draw less power when the loads are smaller. At, say, 600 watts you could run it all day. Or until the batteries give out, at least.
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Old 02-05-2015, 03:00 PM   #4
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1000 watts on a 120 volt inverter only draws 8.33 amps, if it is a straight resistive load... So the draw on the dc input will be slightly higher, according to the efficiency of the inverter. Figure roughly 10-12 amps.

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Old 02-05-2015, 03:05 PM   #5
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1000 watts on a 120 volt inverter only draws 8.33 amps, if it is a straight resistive load... So the draw on the dc input will be slightly higher, according to the efficiency of the inverter. Figure roughly 10-12 amps.

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Sorry Red but W = V x A.

At120 volts the 1000 watt load may only be 8.3 amps, but the input will be ten times that much, or 83 amps.

1000/12 = 83
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Old 02-05-2015, 03:05 PM   #6
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I think Jammer is correct on this....It's north of 83 amps 12V DC, with losses, it's around 90 amps.
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Old 02-05-2015, 03:12 PM   #7
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Sorry Red but W = V x A.



At120 volts the 1000 watt load may only be 8.3 amps, but the input will be ten times that much, or 83 amps.



1000/12 = 83

You're right. Sorry, brain farted for a second there..

-Red, been out of school too long...
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Old 02-05-2015, 03:26 PM   #8
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I maintain a large Uninterruptible Power Supply on my job, 100kW three phase thing, and I totally went off of current in vs current out on my system when I started thinking on this problem. I totally bypassed the battery portion in my thinking... And, the sun was in my eyes, the dog ate my papers, and someone distracted me...

-Red, thinking up excuses...
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Old 02-05-2015, 03:29 PM   #9
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"-Red, thinking up excuses..." If we are to accept the aforementioned excuses, the price is one beer.
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Old 02-05-2015, 03:45 PM   #10
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"-Red, thinking up excuses..." If we are to accept the aforementioned excuses, the price is one beer.

DEAL!!!!

-Red, never thinking he'd get off that cheap...
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Old 02-05-2015, 08:24 PM   #11
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Red, we all do it, no apology necessary and some humor helps us get through the day. I laugh at myself often. Keeps me sane more or less.

Some may argue that last few words.
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Old 02-05-2015, 08:49 PM   #12
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Hey! !!! You're endangering my negotiated free beer!
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Old 02-06-2015, 10:03 AM   #13
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Hey! !!! You're endangering my negotiated free beer!

Wait, you wanted the beer? I totally misunderstood and drank that thing last night...

-Red, slow on the uptake, quick on the chugdown...
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Old 02-06-2015, 10:25 AM   #14
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Nice! I bet they'll make more.
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