I was clearing out the attic the other day and I came across what looks like a very big battery. It looks fairly simple to use, but I would like to see what people make of it and how I should use it (safely). It has a mains (UK) socket on one side and what must be a charging wire on the other side. The charging wire is not attached to a plug, just the bare wires (brown, green/yellow, blue). There is also some info on the top:
TRANSFORMER
TO BRITISH STANDARD 171: 1959
kVA: 0.75 FREQUENCY: 50
PRIM. VOLTS: 240 VEC. GRP.: 71
SEC. VOLTS: 240
SEC. AMPS: 3 PHASES: 1
IMP. VOLTS: (blank) SERIAL NO.: 193429
I’m assuming this is some kind of back-up battery in case of a mains failure? If so, I would like to use it. I assume that I can charge it by connecting the wires up to a plug and supplying mains to it. But how can I tell when the battery is fully charged? Will I damage it if I leave it charging too long?
Also, there is no info about how big the battery is (i.e. Ah), anyone care to estimate based on the pictures?
Unfortunately from work I can't access Image Shack or sites like it. I wish you would have just uploaded the images to this site rather than link elsewhere.
What you describe is a transformer. A 750 VA isolation transformer with a 240 volt primary and secondary (1 to 1 ratio). How are you getting battery out of any of this?
Looks to me like a mains isolation transformer.. all they do is provide 240 volts that is isolated from the main electric supply... It's not a battery charger.