UPS power supply power can be maintained for how long?

The power of the charging machine is generally about 300W, if you do not need a long time power supply with a 500VA backup UPS can be, the time in about 10 minutes. Just two or three hundred dollars, if you need a long time power supply, with a K1000 long machine, backup time from half an hour to 12 hours can be. After installing the UPS, the power outage does not affect the customer's billing records!