Automobile generates about 800 watts at slow engine running and about 1,000 watts at normal engine running. Boat or Yatch usually use 1,600 watts’ charging motor. Thus, an inverter with 1.800 watts output will be more than sufficient for general usuages. We have the capability of producing 2,500 watts output. As the market demand is so scarcely, they can only be manufactured on demand with appropriate quantity to cover the costly moulding costs.