A 5KVA generator provides portable power for use on building sites, camp sites and work on remote properties. To calculate your generator capacity requirements, a good rule of thumb is that 1KVA is equal to 1000 watts. eg. a 230mm (9") Angle grinder requires 2300 watts therefore the minimum generator capacity must be higher than 2300 watts. Please note that some items such as air compressors require more watts on start up than when they are running and this must be taken into account.