Comms-Express.com published a blog explaining how a UPS and a PDU work together and how to size them as a pair.

We have a carefully chosen portfolio of Networking Products in order to give our customers the widest choice possible in Networking Solutions. We offer brands that will suit everyone's budget without any compromise in quality. We're enormously proud of the working relationships we've built up over the years with renowned industry names such as Cisco, APC, Netgear, HP, Fluke Networks & D-Link to name but a few, giving our customers the peace of mind that all our products are backed up by full manufacturers support and guarantee. Our Ethos Comms Express was formed back in 2002. We started with a very simple ethos and that was to provide our customers with a friendly and hassle free service whilst keeping product quality and value for money our top priorities, and we're proud to say that this remains the same today to the point where it's become engrained in to our company DNA. Our People The motivation and enthusiasm of our people here is one of the most important aspect of our business and a key part of our continued growth and respected position we hold in the Networking Industry today. We care for our customers as we do our own business and are committed in providing our customers with a professional and friendly service achieved by having highly skilled and dedicated people.