Pick up 2 deep cell marine batteries, an inverter, a dual outlet air pump from the aquarium section of wall mart, a cheap timer, the biggest air stones, and 1 big dark green plastic tote with a tight lid to place the battery, pump and inverter in.
Use only one marine battery at a time so you can swap one out each time you stop by to check on the grow, set the timer to go on every six hours for say 30 minutes so you keep aerating the water in the tank also keep the tank covered and as dark as possible to keep algae from growing inside the tank. Now remember this is just my 2 cents and I hope others farmers can expand on my post or just kick me in the nuts if so inclined.
