Kim Wisniewsky wrote a nice how-to about installing PowerChute on the ESX Server service console:
Basically because ESX service console has no GUI, and because PowerChute has a Java GUI Installer, the only way to install PowerChute APC PowerChute Network Shutdown for Linux is to use a Helper Red Hat Linux Virtual Machine to install PCNS into, and tar up the resulting binaries and transport them into ESX…
Read it here.