A complete range of regulated inverters to power 220V-240Vac equipment via a car or boat battery. Due to their high performance (> 90%) the inverters generate very little heat. The high stability of the output frequency (±1%) makes them equally suitable to power sensitive devices. These inverters generate a modified sine wave, which although not perfect, is considerably superior to the square waves which are produced by most other inverters. The inverters have an operating temperature range from -15°C to 55°C and are suitable for powering electrical equipment such as portable TVs, videos, lamps, pumps and battery chargers, etc.