Inverters and Grid Intertie (IGI)- Inverters convert dc power to ac, or may be used for conditioning ac power. If a large power source is available from the sun - energy sales to the grid are feasible. This is cost prohibitive today due to the high price of components on a small scale. We aim to make selling power back to the grid feasible on scales of 1 kW. A good inverter is the heart of an off-grid electrical system if batteries are used to store power.