I don’t know how much they cost, at the beginning of this year my work was updating their computers and chucking out the UPS i grabbed two and my mate got about 15 of them. They are a powerware 5 115 with one input and three outputs, input 240v/50Hz,2.5A,1 and output 240v/50Hz,2.1A,1. i don’t know how long would they run for, i was using it for short times (eg: boiling water in the kettle). If i got a few more form my mate could i link them up to make a battery bank?