i cant see this being very efficient at all. Besides if you max out you electricity bill, that means your running atleast 4 1000wtt systems, so i dont know how stealthy this really will be. YOu can get away with it by just telling your elec. company your running a high wattage applience, they wont care either cause ur spending mad cash to them. they might even hook u up on a deal. Plus its cheaper then buyin gas every week.