Quality is the hardest thing to evaluate from the description of a power inverter. You can go by status or by price (i.e. you generally get what you pay for). Cheap power inverters can be good value for money, but be prepared to purchase another one at short period.
Power Inverters convert DC power stored in batteries into AC power to run conventional electronic equipments. A power inverter allows you to run computers, entertainment systems, power tools and kitchen appliances.
Power inverters differ in price, power rating, efficiency, waveform and reliability. They produce three types of waveforms, square wave, modified sine or square wave, and true sine wave. The simplest and cheapest is a square wave inverter, but today it is uncommon. Many devices will not work on a square wave signal. True sine wave inverters work well, but are expensive. It is important to remember that the cheap power inverters might not be of good quality.
Cheap inverters often produce a square wave signal that has the same frequency of a modified square wave inverter, but sharp edges in place of smooth curves. They cause noises in many appliances, but they work quite good most of the time. Transformer operated appliances actually don't like this type of signal. There is really a risk of damaging the power supply running it from a cheap power inverter.
Cheap inverters are fine for light bulbs, but appliances like variable speed motors (e.g., electric drills) and sensitive electronics (e.g., computer power supplies) often get damaged. Lots of cheap inverters are available in the market these days. One way to find such inverters is to read the advertisements and special deals posted by each of the major companies. Then simply compare the prices from company to company and select one. The Internet is also a place where you can do all your cheap inverter research and purchasing.
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