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Old 05-12-2022, 06:37 PM   #1
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What size cable for 2009w inverter

Going to tackle installing my renogy 2000w charget/invertor this weekend and wondering on cable size. Manual says 0-2 awg which seems extremely over kill to me. I'll basically be using the invertor to keep the outdoor kitchen fridge running and the plugs for charging phones. Think 1 gauge will do the trick from the battery to invertor. I'm thinking I'll have a 10-15ft run.
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Old 05-12-2022, 06:58 PM   #2
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Here's a good ampacity chart: https://www.bluesea.com/support/arti...r_a_DC_Circuit
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Old 05-12-2022, 06:58 PM   #3
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Do you mean they recommend a range of 0-2 AWG or 2/0? At the full 2,000 watts you will be drawing 166.7 amps off the battery and since voltage drop at 12 volts is quite high the recommended size for 160 amps at 16 feet is 1/0. A smaller wire might carry the current but heat up and eventually cause problems at the termination's. If you don't plan on using the full rating of the inverter and go with smaller wire you should protect it accordingly. 2,000 watts is barely over what a 15 amp circuit delivers so it probably wouldn't be a stretch to think you might need it all sometimes.
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Old 05-12-2022, 07:10 PM   #4
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10-15ft is a very long cable run. You should probably check the ampacity tables and voltage drop calculator. I’ve got a 2000w inverter with a short 3ft run, and I use 1/0 awg (0 gauge). A 4 awg copper cable will have a 15% voltage drop over a 15ft run 12VDC.

https://www.calculator.net/voltage-d...lculator.html?
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Old 05-12-2022, 07:55 PM   #5
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Put inverter closest possible to batteries... than run a.c. wire longest.. it is easier to run a.c. longer and dc shorter .. so get inverter as close as possible to batteries and then run your a.c. longer..
This is why when electricity frist used dc.. and was found it could only be used for short distance.. then a.c. was found it could go way farther.. that is why we have a.c. power lines .. not dc..
So shorten dc side as much as possible and a.c. longer..
That is layman's language...
Good luck and keep us posted
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Old 05-12-2022, 08:02 PM   #6
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Unfortunately that is the closest I can get to the batteries, the other option would be to move my batteries closer but then they'd be in the same compartment which is also a no go, and I can't really invest in any new batteries this season. Batteries are up front and the closest sealed place for the invertor is this hatch. Click image for larger version

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Old 05-12-2022, 09:07 PM   #7
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Thanks for the pictures.. now we see.. yes you are going to need some big wires..
Good luck and keep us posted
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Old 05-12-2022, 09:53 PM   #8
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I could possibly move batteries into that area then the invertor under the bed but for such a big camper there's not all that much storage
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Old 05-13-2022, 10:42 AM   #9
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And of course all the cheap places to get cable don't have ant 0/2 in stock
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Old 05-13-2022, 02:31 PM   #10
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Try these guys:

https://www.batterycablesusa.com/

Custom made to any size and length and with any kind of terminals.
Sort of expensive, but not as costly as buying the tools you would need to make your own thick cables. They deliver in a week.
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Old 05-13-2022, 04:33 PM   #11
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Quote:
Originally Posted by Marine359 View Post
Try these guys:

https://www.batterycablesusa.com/

Custom made to any size and length and with any kind of terminals.
Sort of expensive, but not as costly as buying the tools you would need to make your own thick cables. They deliver in a week.
That's pretty cheap compared to what I had to pay, but with shipping and conversions about the same. Had to pay 11$ a foot and that was with my company discount lol
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Old 05-15-2022, 06:31 PM   #12
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Almost completed. Just need to run the cable for the power switch inside Click image for larger version

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Old 05-15-2022, 08:05 PM   #13
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Quote:
Originally Posted by Sasq40 View Post
Going to tackle installing my renogy 2000w charget/invertor this weekend and wondering on cable size. Manual says 0-2 awg which seems extremely over kill to me. I'll basically be using the invertor to keep the outdoor kitchen fridge running and the plugs for charging phones. Think 1 gauge will do the trick from the battery to invertor. I'm thinking I'll have a 10-15ft run.

In one of my RVs I have a ~8' run from my 2000w inverter to my batteries. This was what I found to be the least expensive wiring to use:
https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1


Because I knew that at 2000w it could actually draw 150+ amps, I actually used 2 sets of parallel wires with the above mentioned cables. 2 positive wires and 2 negative wires. Probably an overkill, but I wanted to have a low voltage drop.


Yes, I had to buy a crimping tool.
https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1
but I didn't mind because it would allow me to make exactly the lengths I wanted, I was also installing solar with more crimping needed, AND I've got 3 RVs that I added solar and inverters to. Money well spent.


Good luck!
Chris
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Old 05-15-2022, 08:09 PM   #14
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Quote:
Originally Posted by Sasq40 View Post
Going to tackle installing my renogy 2000w charget/invertor this weekend and wondering on cable size. Manual says 0-2 awg which seems extremely over kill to me. I'll basically be using the invertor to keep the outdoor kitchen fridge running and the plugs for charging phones. Think 1 gauge will do the trick from the battery to invertor. I'm thinking I'll have a 10-15ft run.
#1 would be way too small. The minimum you can use on a 2000 watt inverter is 1/0. At 15 feet you definitely need 2/0.

My Winnebago came with a 2000-watt Dimensions inverter and it had an 8' run of 1/0. When it went bad I replaced it with a 2000 watt Renogy and just used the factory 1/0, fully intending to replace it with 2/0. After the installation, I tested it out with the clamp on amp meter. With only the refrigerator running it drew over 40 amps. That is what it should be. The fridge is about 450 watts, and the conversion comes out about right with little loss in efficiency.

Then we tried the microwave/convection oven. The microwave is 1400 watts. It started out at about 130 amps, but within 3 minutes it climbed to over 150 (as the wire heated up). And then it tripped the overload on the inverter.

So my conclusion was that 1/0 is not big enough to run a 2000 watt inverter if you are going to run anywhere near its capacity.

I am currently replacing the 2000 watt Renogy with a Victron hybrid inverter and will be replacing it with 3/0.

Yes the wire is expensive, but so is a fire. Or even something as simple as burning out an inverter because it has to work so hard at load.
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