This is a bit off-topic, because it's only a few years old. I've decided that the "big" UPS which has been sitting in my workshop, unused, for almost a year, really is surplus to requirements, so it's free to anyone *who can collect it* and feels like replacing the batteries. It's a Powerware Prestige 6000, with two battery boxes, software, manual, and various cables. Input is rated 200/208/220/230/240V AC at 19A (power factor 0.9) single phase, output is 200/208/220/230/240V AC at 19A (max 3000W). The battery boxes are each rated 120V DC 50A and 5AH capacity. Size is about 40cm deep x 25cm wide x 28 cm high for the control box and the battery boxes are half the height, so 40 x 25 x 14 each. They all stack nicely together (in any sensible order). I have used it, but the batteries (10 x 2V gel cells in each box) do need replaced -- most will not hold any significant charge/voltage. It needs to be gone by Christmas, too, or it's going in the skip. -- Pete Peter Turnbull Network Manager University of York