Powertec supplies india pvt. Ltd. Offers microprocessor controlled sinusoidal inverters, which come with 24o v ac, 50 hz output in 150 w to 4 kw capacity using 12 v dc/24 v dc lead acid batteries. The 500 w inverters usually deliver 1400 w for short durations and 650 w for 30-minute duration. There is no power factor limitation for inductive loads. The 50 hz sinusoidal wave shape with total harmonic distortion [thd] less than 0.5% is preserved from no load to 110% overload conditions. The powertec inverters have no harmonic contents, distortion, wave clipping or zero crossing errors as found with pwm and other carrier modulated control systems. The compact, sturdy powertec inverter operates at 92% efficiency and the no load power loss is less than 2 w. Protection from short circuit, under and over voltage etc, are some of the standard features included in the powertec inverters. All units of powertec inverters are very light -weight, e.G., a 150 w unit weighs 2.5 kg while a 500 w unit weighs only 6.5 kg.
