Most of the lower cost solar systems use modified square wave or modified sine wave inverters. Both of these types can be very unfriendly to your delicate electronic equipment and can cause motors to overheat. Sine wave inverters provide clean, safe power that is often better regulated than utility power. It's true that these inverters cost more, but we believe that our customers understand the difference and prefer the safer alternative.
Grover--- Resident prognosticater. If you need specifics, contact me at firstname.lastname@example.org.