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.