On Grid (Tied) Inverters
All grid-tie inverters
produce the pure sine wave that is compatible with the alternating current waveform produced by your utility company. Sine wave inverters are a little more expensive, but they are compatible with almost all equipment and appliances that can be operated with power that comes from the grid. These multifunction inverters also allow you to send excess power to your utility company, in essence storing excess energy in the grid. Grid-tie inverters can be used to keep a back-up battery bank charged for emergency power in case of a utility power failure.