The second set of batteries arrived, and I've put them into another 3000AV UPS. So now I have five of these large UPSes working. The biggest problem, is their weight. They must weigh around 50 kilos; I can barely raise one off the ground.
I'm putting a server together for running Wordpress on. The biggest challenge is going to be making it secure - PHP and wordpress have a long history of insecurity. I'm thnking a firewall will help.