I'm not and electrician, but I'm familiar with Ohms law. A/C and D/c is apples and oranges. I wouldn't try to use the same wiring. Low current D/C looses amps too fast while traveling on a wire, that causes heat. I've got a 400w emergency solar system. I run a TV and computer on it all the time. I think the battery bank alone, is going to cost more than I'll profit from it. But, I'm glad to have it. I convert to 110v and run separate house-hold wiring (romex), I've got 110v LEDs mounted in there. I think you should consider a 110 inverter. Look at the proper wire you would need to run 12 volts more than 25 feet. You'd need to start with a giant wire, and you'd still loose power and make some heat before you get to the appliance. You also need a Charge Controller. If you're going to use the system all the time, The MPPT type is worth the extra money. Most Charge Controllers will alloy to pull a 12v system separately. The battery-bank size is the critical number on a system. When you find out what that is, you'll know the rest of the story.