Commercial sinewave inverter provides an economical way to get instant good quality AC sinewave power anywhere and at any time as long as a large enough, and full battery, is handy. The inverter range is specifically suitable for camping and non-permanent power systems. Robust design, quiet and portable. It can therefore be operated in almost any environment as long as it operates in its pre-described parameters. The unit has a reasonably high current start up capability and has some protection against short circuits, reverse polarity and over load. The protection circuits are limited and depend on circumstances applied. The unit also has automatic load sensing.