UPS Battery Constraints
The battery must enable continued operation over a time that is not:
UPS batteries have standard backup times of five to ten minutes, at a very reasonable cost in terms of installation and operation.
Diesel Generator Constraints
A Diesel Generator must operate a minimum amount of time (at least 15 minutes) to avoid excessive wear, and must be started only when necessary. A normal Diesel Generator requires approximately two minutes to start and ramp up to the point where the temperature is stable.
This process includes the following:
• the diesel engine driving the generator must start and reach its rated speed (eight to ten seconds).
• The motor and the generator must ramp up to full power (12 to 15 seconds).
• A Diesel Generator may not start on the first try and may stall during the ramp-up period.
A Diesel Generator combined with a UPS must not start until approximately three minutes after utility power has been lost:
• to provide the distribution-system automatic devices (reclosers, etc.) with the time required to restore power, if possible
• to avoid frequent and unnecessary starting of the Diesel Generator.
Our Conclusion and Suggestion
A backup power protection system providing ten minutes is well suited to Diesel Generators. It corresponds to a cost-effective, standard solution that ensures optimum use of the battery itself and the Diesel Generator.
A ten-minute backup time provides:
The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.