Sumec Firman ECO4990ES – is a cost effective generator for your home or small business. Sumec Firman ECO3990ES- is a value for money. Though the generator is model 3990. It is not 3kva generator. It is rated at 2.5kva and a recommended maximum load of 2.5kva. So this 2.5kva generator would be able to power your fans, bulbs, 1 TV, 1 Home theatre, Fridge or Freezer. It is important to load generators cautiously to prevent overload.