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Frequently Asked Questions:
Power Pros sales reps field thousands of power related questions, here are some of the most common:
1) What size ups do I need ?
Determining the size of the ups is a pretty straightforward process. The first thing to determine is the power requirement of your equipment. Most pieces of equipment have a tag on the back that will tell the watts or amps used, and the voltage. Next, select a ups that is at least 30 % larger than the power requirement. If you aren't sure, you can always speak with a Power Pros sales engineer for help determining the proper size.
2) I want more runtime, should I purchase a larger ups system ?
No, to get the best value, spend your money on batteries rather than buying a larger ups system. Power Pros carries many models that allow you to add external battery packs for long runtime applications. So, for example, instead of getting a 2000 VA ups system, purchase a 1000 VA with an extra battery pack to get longer runtime.
3) What is the difference between off-line, line-interactive, and on-line ups systems ?
Off-line ups systems are the most basic type of ups system and are typically used for home PC's and workstations. They monitor power quality, and switch to battery when power quality falls out of acceptable range or when a power outage occurs.
Line interactive ups systems are often used on PC's and file servers, and are a middle grade of ups system. They monitor power quality and have boost/buck circuits to keep power quality in check. When power quality goes too far aout of range or a blackout occurs, they switch to battery.
True on-line double conversion ups systems use a device called an inverter to re-create power to isolate the equipment from incoming power. The inverter is constantly converting power from AC to DC and back to AC again. The battery is wired in parallel to the inverter, so when an outage occurs, there is a seamless transition to battery. These systems range in size from 700 VA to 500 kVA and power everything from sensitive lab equipment to corporate datacenters.
4) How long do ups batteries last ?
UPS batteries typically last 3 to 5 years. The main factors that affect battery life are the amount of use and the environment. Battery life can be significantly reduced by constant discharging and recharging and either hot or cold environments. For example, a ups system on a factory floor may see temperatures in the upper 90 degree range, and be used often to offset dirty power. These batteries should be changed out every third year to ensure reliable operation.
5) Can I change the batteries myself ?
In many cases the answer is yes. Most ups systems under 6 kVA have user replaceable batteries and are designed to be changed by the end user. Larger systems should be handled with care and only trained personnel should change those batteries. |
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