After having tried several brands, I like CyberPower for the combination of price/performance.
Things may have changed, the APC UPS systems I've used required you to power off to replace the batteries. the CyberPower units I've used allow for replacing the batteries hot.
I've had terrible results with Tripp Lite UPS systems - where they fail for no reason at all, and will not auto power up after a power failure.
At a very large size of 30KVA, I've used Eaton UPS systems and they have been rock solid.
Things may have changed, the APC UPS systems I've used required you to power off to replace the batteries. the CyberPower units I've used allow for replacing the batteries hot.
I've had terrible results with Tripp Lite UPS systems - where they fail for no reason at all, and will not auto power up after a power failure.
At a very large size of 30KVA, I've used Eaton UPS systems and they have been rock solid.