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Square Wave power inverters This is the least expensive and least desirable type. The square wave it produces is inefficient and is hard on many types of equipment.
These inverters are usually fairly inexpensive, watts or less, and use an automotive cigarette lighter plug-in. Do not even consider one of these types of power inverters for a home system. Modified Sine Wave Power Inverters Modified-sine wave power inverters produce a power wave that is sufficient for most devices. Modified Sine Wave inverters are usually better in typical solar applications when electric motors are not involved.
It produces an AC waveform somewhere between a square wave and a pure sine wave. Modified Sine Wave inverters, sometimes called Quasi-Sine Wave inverters are not real expensive and work well in all but the most demanding applications and even most computers work well with a Modified Sine Wave inverter. Because the current is not alternating perfectly, the stepped waveform of the modified sine wave inverter causes the inverter to generate an irritating buzz However, there are exceptions.
Some appliances that use motor speed controls or that use timers may not work quite right with a Modified Sine Wave inverter. A True Sine Wave power inverter produces the closest to a pure sine wave of all power inverters and in many cases produces cleaner power than the utility company itself.
It will run practically any type of AC equipment and is also the most expensive. True sine wave inverters are a little pricier than modified sine wave inverters because of the reduced noise and their strong compatibility with certain devices, such as electric motors. This is the better option if you value silence, or want optimal performance from electric motors, such as those found in an electric water pump. Many True Sine Wave power inverters are computer controlled and will automatically turn on and off as AC loads ask for service.
If you are connected to normal Utility company power and just want to add some Free Sun Power electricity to reduce your electric bill and you do not need a totally independent system, it is possible that a Grid Tie power inverter will suit your needs.
With a Grid Tie power inverter, whatever electricity that your solar panels produce will reduce the amount supplied by the utility company, in effect lowering your bill.
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