ISO 8528 defines a low power generating set as one with a power of less than about 10kW, but size is not the primary consideration.
Low-power generating sets for the purpose of this standard are determined by the following special features:
— the users normally are laymen
— the complete generating set is usually transportable, or mobile;
— the electrical output is connected by plugs and sockets
— the generating set is ready for use without any additional installation work by the user.