I have been asked to install a feed to a greenhouse which also needs to be able to run of a generator in the event of a power cut. I will in stall a swa feed from an rcbo in the house consumer unit in to a change over switch then a two way consumer unit with one socket point and one light. Was going to install a ip65 industrial socket on the outside to plug a generator into feed that side of the change over switch, its only to keep a water pump for the property going which is plugged into the socket. Not dealt with generator back up before so does this seem a feasible simple arrangement or have I missed something any advise grateful