How Many UPS Units Do You Require for Data Center?
We hear the term redundant. A lot, but how do we know how many UPSs to have or what arrangement to use when designing a data center? We offer best UPS products for APC Easy UPS 3M.
The first consideration is the amount of equipment that our UPS must support, as well as which equipment is mission critical and which is not.
The UPS is also a piece of equipment that serves as a harmonic filter or that provides clean energy to your data center. Our solutions of UPS are best for APC Easy UPS 3M.
Desired Levels of Availability
Now, to certify the data center, we must consider the desired level of availability.
According to the ICREA, the following levels are available depending on your infrastructure:
• QADC LEVEL I:
Computer room in a certified environment (Quality Assurance Data Center). To ensure 95% availability,
• WCQA LEVEL II:
Computer room in a world-class certified environment (World Class Quality Assurance). For 99.9% availability,
Reliable computer room with world-class certification • S-WCQA (Safety World Class Quality Assurance). To ensure 99.9% availability,
Certified high-security computer room. For 99.99 percent availability, use HS-WCQA (High Security World Class Quality Assurance).
World-class computer room with high security and availability. For 99.999 percent availability, use HSHA-WCQA (High Security High Available World Class Quality Assurance).
World-class computer room with high security and availability. For 99.9999 percent availability, use RHA-WCQA (Redundant High Available World Class Quality Assurance Data Center Net).
Now we must consider that to relate the watts of our source to the VA of the UPS. We must employ a concept known as “Power Factor,” or “CFP.”
The typical power factor (CFP) of a computer equipment ranges from 0.7 to 0.6. We will use the most conservative value 0.6. Thus, the relationship between Watts and VA that we are interested in is: (VA)x(CFP)=Watts
This means that a 1000VA UPS can power a maximum of 600Watts from a 1000×0.6 source. To determine the VA required by your source, divide the power by 0.6. For example, if your source is 1000W, the UPS you need must be at least 1000W/0.6, or 1666 VA.
How Do You Calculate the Effective Backup Time of A UPS?
As an example, consider a 1750 VA UPS. A formula will require here. It is not difficult, but it will provide you with extremely useful information.
You will need the following information:
B = the number of batteries in the UPS
V = voltage of the battery
Ampere = Ah
-Battery life hours
Ef = the UPS’s efficiency (as a rule, it usually ranges between 90 percent and 98 percent depending on the brand)
VA = UPS Volt-Amps
All UPSs must have at least one battery… be cautious because we frequently purchase voltage regulators instead of UPSs.
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B: Assume your UPS has a single battery. Of course, there are multi-battery units. Use this information with caution if you come into possession of a UPS with multiple batteries.
V: You will use 12 volts (generally, all UPS batteries are 12V, but different types of batteries exist). You must confirm this information with the manufacturer of your UPS).
We will take 9-amp hours (Find confirmation in the manufacturer’s manual).
UPSs have a 95 percent efficiency rating. You will use 0.95 (Note: this varies depending on the brand and technical specifications of each UPS). I recommend that you check this information in your equipment’s manual).
The better the equipment you choose, the higher the efficiency.
VA: Keep in mind that it is UPS Volt-Amps.
The blackout service time formula is ((B x V x Ah x Ef) / VA) x 60= Minutes of service. To determine the number of UPS for a data center. Consider the availability that we want our data center to have.
To determine the capacity of the UPS, add all the consumption in watts or in VA of all the equipment to back up. And then multiply it by 30% as a growth factor. You should consider a minimum of 5 minutes to back up at full load to give your emergency plant time to take care of the entire load until the next backup.
The more backup time at full load you require. The more batteries you will require, so your UPS solution may be more expensive than expected. Therefore, I recommend that you consider a power plant in addition to your UPS backup.
Remember that a UPS is a transitional piece of equipment. Which means that it will only provide you with a limited amount of energy. That allows you to perform other actions and you to continue operating your data center.
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