The decision to use a standby generator depends on the reliability of your utility provider’s distribution system, economic and/or safety risks inherent to the protected application and a cost comparison of different solutions, with or without a standby generator.
For each of these points, the following aspects must be considered:-
• Security of supply provided by your utilities distribution system – risks of downgraded voltage quality (due to other users causing disturbances, climatic conditions, etc.) that can result in repeated use of battery power and a reduction in the actual backup time available.
• Risks of extended outages – what guarantees does the utility provide and what backup means does it have at its disposal?.
• Economic and/or safety risks involved – how critical are the protected applications and what is the cost of down time?
• Cost comparison between a solution with a battery and a solution with a generator – the analysis must take into account the power ratings, any possible load shedding, the available space, operating constraints (special rooms, noise, etc.). Practically speaking, gensets are useful for long backup times when the application requires at least 30 minutes to one hour or longer
UPS backup time when a Diesel Generator is installed:-
When a diesel generator is available, UPS backup time must take into account the generator start up time, as after this the generator will be powering the UPS and the UPS batteries. So there is no requirement for a long UPS autonomy. 10 minutes battery backup is all that is required. Once the generator has started, it will power the UPS for as long as there is fuel in its tank.
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