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Old 04-03-2012, 10:04 PM   #11
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Originally Posted by RPAspey View Post
if you don't mind my observations, the stock wire in mine was #8. if yours is the same, you'll have over 4% drop at 25 amps. use one of the free on line calculators to determine your voltage drop.standard recommendations are to keep it less than 3% but lower is better. 25 amps dc is only a reference that I used as that's all my solar charge controller will allow. the #4 wire I installed is only ok for now because I have a small 200 watt inverter only used for a small led tv. any more draw and I'll have to go alot bigger wire. I ran conduit under the camper to make the future upgrade easy.
Hmmm, and I noticed it wasn't a particularly high grade of wire either. I'll keep that in mind. I do have a bunch of 2 Gauge I picked up for a different project that I haven't gotten around to in the last 3 or 4 years
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Old 04-03-2012, 10:15 PM   #12
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Learn from my mistake! I installed #4 wire from my rooftop collector box down to the controller, from the controller to a nose compartment junction box, and then from there to the batteries. That was when I hadn't completely anticipated, or researched a "big" inverter. Once I decided (convinced myself) that I needed a 2000w PSW inverter, I did some research, and found that I couldn't just tap into the nose compartment junction box, but that I either had to yank-out the #4 wire from that box to the batteries and relace it with larger wire or make a new run of #0 wire. Since the #4 was in-place, working fine, and already siliconed and sealed, I added a pair of #0 wires from the batteries to the inverter, and a second catastrophic fuse to protect the inverter.

So if you have ANY plans to go to a big inverter anytime in the future, go BIG on your cable selection!
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Old 04-03-2012, 10:19 PM   #13
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Yep, 2000 watts is 167 amps DC.
Takes a BIG wire to handle that kind of current without heat loss.
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Old 04-03-2012, 10:32 PM   #14
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Is that a battery switch in the trailer. Not at the battery box.
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Old 04-03-2012, 10:32 PM   #15
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1/0 cable would be great ! I would hate to buy it though .
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Old 04-03-2012, 10:32 PM   #16
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Originally Posted by Fire Instructor View Post
So if you have ANY plans to go to a big inverter anytime in the future, go BIG on your cable selection!

Oh no...

I JUST finished running #8 from the charger up to the roof an hour ago. Thankfully its was a pretty straight shot, I only used about 10 feet.

If I did a large inverter, I was pretty sure it was going to be mounted in the front pass through storage.



Thats pretty close to the batteries, and I figured I'd run AC back from there with orange 10-2 Romex. I'd probably rewire that transfer switch and just switch the whole panel between shore and inverter power...

I know you mentioned you boiled water in the microwave, but how long can you run your microwave off the battery power? An inverter that big has really got to suck them down??
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Old 04-03-2012, 10:34 PM   #17
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Is that a battery switch in the trailer. Not at the battery box.
Yes.
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Old 04-03-2012, 11:04 PM   #18
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Yep, 2000 watts is 167 amps DC.
Takes a BIG wire to handle that kind of current without heat loss.
I have 2 gauge for the stereo in my truck. It used to be protected by a 145A circuit breaker. I kept tripping that so now there is a 160A breaker on it.

Stereo current draw is very transient, but my amp rack has a 2.5 Farad capacitor in it. Never had a problem with the 2 gauge. Now, the 8 inches of 8 gauge coming off the alternator, it seems to get warm...
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Old 04-03-2012, 11:52 PM   #19
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1/0 cable would be great ! I would hate to buy it though .
Hmmmm. Its not as bad as I was expecting.

Metra BC10BL25 1/0 Gauge Blue Power Wire - 25 Foot

Gotta remember to get enough to do all the battery interconnects and the ground, too.
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Old 04-04-2012, 12:03 AM   #20
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I saw a deal like that when I ordered my cable, but then thought about it.

How much money am I saving by buying cable all one color?

How much money will it cost me if I burn something up by accidently connecting it incorrectly?

I spent the extra money on black and red cables.......
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