Sumec Firman SPG1800 Promax – is a cost-effective generator for your home or small business. Sumec Firman SPG1800 Promax – is value for money. Though the generator is model 1800, it is not a 1.8kva generator. It is rated at 1kva and has a recommended maximum load of 1.1kva. So this 1kva generator would be able to power your fan, bulbs, 1 TV, 1 Home theatre. It is important to load generators cautiously to prevent overload.