2. Inverter Modified Sinewave, This wave should you use for this wave approached and almost been like electricity and power with a wave of modified sinewave inverters are suitable for backup power needs for TV, Computer,, it's just lack power inverter modified sinewave with a wave of this type if you want to use the motor equipment such as air conditioners, water pumps, and refrigeration equipment and the required type watt motor power inverters are great for holding large initial pull of the air conditioner, refrigerator and other motor equipment
3. Inverter pure sinewave, pure sinewave advantage of this wave is equal to a power source, only the lack of wave power inverters pure sinewave is an expensive price
That's the kind of waves at power inverter, if there are any questions then please consult with me or go to the seller. I'm just trying to help you alone. Hopefully useful