On the far left we have the original Swan Morrison 12V 24 Amp issued Generator. This was replaced in the late 80’s with the Yamaha EF 1000 which provided Master posts with 240 volts and 800 watts of power. The Yamaha EF 1000, as far I know, was not issued to standard posts. The last image is of the original post batteries. There were “Submarine Batteries”. The plates within being a solid lead sheet which would not warp or buckle. Renew the rubber seals and fill with new acid these would still produce the required power after all these years. In the interests of Health and Safety though, I’ve opted to use leisure batteries which you can see in the very bottom of the picture.