Low frequency inverters, also known as heavy duty inverters offer a far longer life expectancy than light duty, high frequency inverters. Low frequency inverters also offer a much high peak power capacity than high frequency inverters. Low frequency inverters are also far safer than high frequency inverters because they block dangerous high voltage, high DC current from ever reaching your AC appliances or your EV through the use of a heavy duty, iron core, copper wound output transformer.Low frequency inverters do cost somewhat more than high frequency inverter, but the added cost is well worth the price when it comes to safety, reliability and longevity.