A free alternative to PowerChute is the Free software project APC UPS Daemon (Apcupsd), which supports Linux, Mac OS X, UNIX and Microsoft Windows operating systems and can run in stand alone or client-server modes. Frequency and voltage regulation Gives higher application availability by correcting poor frequency and voltage conditions without using the battery.

Standard models are the most popular UPS in the world for business servers, storage and network devices and have long been considered the benchmark for reliability and manageability. The higher the VA rating of a Smart-UPS unit, the longer it will last, but keep in mind that the load you apply to your UPS unit also makes a difference. The 2U rackmount 500W 750VA UPS is trusted to protect critical data and equipment from power problems, and supplies clean and reliable network-grade power. Plug-and-Play external batteries Ensures clean, uninterrupted power to the loads when adding extra runtime to the UPS. Advanced Battery Management - Temperature-compensated charging extends life and advanced algorithms recommend replacement date.Patent-pending operating mode that by passes unused electrical components in good power conditions to achieve very high operating efficiency without sacrificing any protection. If you want to make sure that you never lose power and you don't want to go through the hassle of reconnecting your devices whenever there's an outage, the APC Smart-UPS battery backup units in this collection might be perfect for your situation.

A new extended runtime battery pack provides longer runtime in a small 2U footprint while tripling the life expectancy of the UPS. Rack- mounted Smart-UPS are ideal for powering Blade or density optimized servers in a distributed power protection environment as the primary or redundant protection solution. Remote monitoring of UPS, Generators, Air Conditioning, Site Access and Environmental Systems is essential to allow swift offsite investigation of fault reports and real-time monitoring of the site status, allowing the correct response to be created and dispatched to site. The more of a load you put on your device, the shorter of a period it will be able to provide backup power. Intelligent battery managementMaximizes battery performance, life, and reliability through intelligent, precision charging.An "extended run" series, with an Anderson Powerpole DC connector allowing up to 10 external battery packs to be daisy-chained to the main unit.