Wire Size for a battery to charge controller

[chopperprop]

I did a search of this forum for a wire size chart but found no answers.
My question is about the correct wire size from the battery of a solar system to the charge controller.
If I have a 700CCA 12 volt battery to wire up to a charge controller that is going to supply power to a 1000 watt inverter and the inverter is going to pull around 750 watts most of the time what size of wire do I need?

I know that I am safe using 14 awg from the inverter for 10 amps at 120 vac or 12awg for 20 amps and 10 awg for 30 amps and so on but what I am unclear on is the power feed from the battery to the controller and or the power feed from a battery to an inverter .

If I am consuming 20 amps from a 120vac inverter lets say running a heater am I also pulling 20 amps from the battery to the inverter and or charge controller?
Thanks

[russ]

I did a search of this forum for a wire size chart but found no answers.

Look for posts by another moderator mike90250 in his signature line there is a wire size calculator link

[Wy_White_Wolf]

...If I am consuming 20 amps from a 120vac inverter lets say running a heater am I also pulling 20 amps from the battery to the inverter and or charge controller?
Thanks

If you're pull 20 at 120VAC you'd be pulling 200 amps at 12VDC plus inverter loss.

20A * 120V = 2400Watts

2400W / 12V = 200A

WWW

[SunEagle]

The wire size between the charge controller and the batteries needs to handle the maximum current rating of the Charge controller. So a 30Amp CC = #10 wire, a 45amp cc = #8 wire and so on.

The wire between the battery and the inverter will be based on the maximum wattage of the inverter divided by the battery voltage. So that 1000 watt inverter would require a wire size to carry a minimum of 84amps (1000w / 12v = 83.3amp).
You should also use a fuse rated slightly below the wire amp rating to protect the wire from overheating.

But don't forget that most inverters have a "regular" and "peak" wattage rating. So to be safe you should size your wire based on the peak wattage or somewhere above the regular wattage rating and again install a fuse to protect that wire.

[Mike90250]

Wire size charts for "safe conductor temperatures" do not account for distance losses. So there is a nice calculator (.zip'ed spreadsheet) in my .sig below

[SunEagle]

Wire size charts for "safe conductor temperatures" do not account for distance losses. So there is a nice calculator (.zip'ed spreadsheet) in my .sig below

Mike

Good point. I keep forgetting that having the wires between the CC, battery & inverter as short as possible is not always something others think about.

[chopperprop]

Wire size charts for "safe conductor temperatures" do not account for distance losses. So there is a nice calculator (.zip'ed spreadsheet) in my .sig below

Thank You

[OceanArcher]

re: Wire Size Required

You would be drawing about 200amps from the battery when powering the load you described. The cable running from the battery to the inverter would have to be size 1/0 copper , and no more than 15 feet from the battery to the inverter