Single UPS installation
As the description implies this represents a single uninterruptible power supply installation comprising of the UPS and battery where the battery can be internal or external and consist of single or multiple strings. Multiple strings can increase the autonomy and also provide greater security of load in the event of a utility mains failure.
It should be noted that when the load has been transferred to the maintenance bypass mode it would be unprotected in the event of a utility mains failure.
Hot Standby UPS Installation
This installation uses two UPS modules, referred to as a UPS System; one (A) is directly coupled to the load, the output of the second (B) supplies the reserve input of A. Therefore if UPS A inverter fails the load is switched to the inverter output of UPS B and is still protected in the event of a utility mains failure. Equally either UPS can be switched to the maintenance bypass condition with no loss of protection to the load in the event of a utility mains failure. This is used when either the UPS or Generator power protection system are serviced as part of a regular maintenance regime.
Parallel...
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