The quasi sine wave inverter is by far the most popular for general use applications. All Sterling inverters are continuously rated at 4O'c, with overload, over voltage and low voltage cut outs. All the inverters come with cable and 24 ct gold connectors, in order to prevent battery terminal corrosion. The big plus with this type of the inverter is the cost. It is low cost and high performance, linked in with the fact that it will run 95% of general equipment subject to the correct output of the inverter.