How to select ups 
                     How To Select Uninterruptible Power 
Supply  (UPS) For Industrial Environments?
What do you mean by UPS?
A UPS system is a device ready to supply power to critical IT  
equipment in the event that the main electrical power supply is  
cut. As such, a UPS is an essential part of any business  
continuity strategy.
Why are UPS systems important?
The main reason for deploying a UPS system is to provide a  
kind of insurance policy against complete power failure or  
intermittent power failures. In this way, UPS systems ensure  
that the IT processes and workflows being undertaken by the  
organizations continue as normal.
Operating an organization without a UPS leaves you open to  
sudden, unexpected downtime that may last for an  
indeterminate period.
How much do UPS systems cost?
UPS systems vary in cost according to how much power they  
are capable of producing and for how long (runtime).
The larger the requirement, the more expensive the UPS system  
will be to purchase.
Other factors impacting on cost would be the kind of UPS  
technology used and any unusual design characteristics.
Of course, the purchase price of a UPS system is only part of  its 
whole-life cost. Other considerations include:
 Shipping Overall solution design 
  Installation and commissioning  
 Servicing and maintenance  
 Consumables e.g. batteries, fuel
What kinds of UPS are there?
There are three main UPS technologies:
 Battery UPS
Most UPS systems operate on the principle of using standby  
batteries to provide a defined runtime period against a given  
load. The batteries are permanently online and available to  
autonomously take over the power supply for the organizations  
once a power drop or failure is detected.
 Rotary/Flywheel UPS
Flywheel-based rotary UPS systems use stored energy in the  
form of a high-mass spinning flywheel using magnetic bearings.  
In event of power drops or failures, these can deliver valuable  
seconds of immediate power to the organizations to avoid  
disaster.
 Fuel Cell UPS
Fuel cells are essentially batteries that do not run out of energy  
so long as they are fed with sufficient fuel. Energy is created  
from chemical reactions resulting from changes to the fuel  
produced within a specially-designed polymer exchange  
membrane. Fuels include hydrogen, phosphoric acid, solid  
oxide, and molten carbonate.
 Sizing
Undersizing your UPS can have disastrous consequences.  
Oversizing can be a waste of money and result in an inefficient  
system. Sizing your UPS correctly ensures that you have  
enough power to supply to mission-critical organizations.
Sizing your UPS properly means finding out what your power  
requirements are.
 Single-phase vs. 3-phase power
Your organizations will either be served by single-phase or 3-  
phase power. This is important because UPS platforms are  
purpose-built to operate in one or the other. Ask your  
facilities/estates manager, your utility provider, or a qualified  
electrical contractor if you aren’t sure which your environment  
is being powered by.
However, if you are currently on single-phase power and your  
power requirement is growing, you may need to change your  
underlying power distribution as well as your UPS in order to  
achieve the resilience and reliability you are looking for.
 Scalability
Energy needs associated with IT usage can be unpredictable  
and it is a constant challenge to plan for change without  
compromising power protection.
The answer lies in operating a UPS infrastructure with
sufficient scalability to cope cost-effectively and non-  
disruptively with growing power demands.
Staying on top of your power protection is critical to protecting  
your expensive equipment and valuable data. A UPS system  
can be monitored in many ways, from a basic LCD screen to a  
full software package that allows you to monitor and control  
the UPS system remotely.