That depends on what you'd like to power with your inverter.
True sine wave units produce power which is almost identical to the utility grid, will operate any appliance within their power range, and cost more per watt of output. If you find that your high end appliances (such as the plasma TV) don't like the modified sine wave from your inverter, consider adding a small true sine wave inverter such as the Xantrex XS400. Modified sine wave inverters can adequately power most household appliances and power tools. These inverters are less expensive and also tend to be the most popular in the market today. Most electrical equipment can operate without any effects on a modified sine wave; however, the modified sine wave can present certain compromises with some appliances such as microwave ovens, laser printers, clocks, and cordless tool chargers.
Tekris Power has found that customers who use the modified sine wave inverters find the following issues: Some large motors (refrigerator, fans, sump pumps) tend to require more power due to the lower efficiency of the modified sine wave. Therefore you may need to choose a modified sine wave inverter that will accommodate the surge of your appliance plus 20% (20% is a generalized estimate used for quick calculation). Tekris Power has also found, through troubleshooting with our customer Just Another Way Builders in upstate New York, that the ignition for some of the newer, more advanced hot water heaters and furnaces require a true sine wave to power the start-up of the appliance. Tekris Power found that the Morningstar Sure Sine 300 watt inverter was more than adequate to accommodate the sensitive equipment. Timer devices such as digital clocks, microwaves, bread machines, will be affected by the modified sine wave. Usually the appliances operate, but the timer will not count down inaccurately. Laser printers are also subjected to this kind of interference as well. Public announcement systems, depending on the specific equipment, encounter background noise and interference with modified sine wave inverters. Small tool chargers can also burn up with use from a modified sine wave inverter. If you have questions about your appliances? electrical specifications, please call the manufacturer before assuming their compatibility with a modified sine wave source.
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