1, to determine the power of your equipment is how powerful, generally speaking, the power of ordinary PC or industrial computer in about 200W, Apple in about 300W, servers in 300W and 600W.
2, to determine the model of the host can be calculated how much capacity of the battery required, the battery is to determine the length of the backup battery life.
3, sometimes with a set of UPS power supply, in general, it is best to ask the professionals to go now to see, because the understanding of the situation on the spot so that is the best.
Expanded information:
Precautions
1) The environment of the UPS should be well ventilated, conducive to the dissipation of heat, and to keep the environment clean.
2) Do not carry inductive loads, such as money counting machines, fluorescent lamps, air conditioners, etc., to avoid damage.
3) UPS output load control at about 60% is the best, the highest reliability.
4) UPS with too light a load (such as 1000VA UPS with 100VA load) may cause deep discharge of the battery, will reduce the service life of the battery, should try to avoid.
5) appropriate discharge, help the battery activation, such as long-term non-stop utility, every three months should be artificially disconnected from the utility with a UPS load discharge, which can extend the service life of the battery.
6) For most small UPS, work and then open the UPS, boot to avoid starting with a load, off duty should be turned off the UPS; for the network room UPS, because most networks are 24 hours a day, so the UPS must also be run around the clock.
7) UPS should be charged in time after discharge to avoid battery damage due to excessive self-discharge.
Reference:
UPS Baidu Encyclopedia