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6 Important Factors To Consider When Buying a UPS

With the predictions of a very active storm season between now and January and with questions over the reliability of our power in general, it is perhaps timely to explain what to look for when choosing an Uninterruptible Power Supply (UPS). A UPS is vital to protect your office equipment from damage that may be caused by a sudden power outage, under voltage or over voltage. You can’t just go to a store and grab the first UPS you see. There are several factors you need to consider to ensure you get the best one suited for your needs.

6 important Factors to Consider When Buying UPS

1. What are you going to connect to it?

Determine what equipment you will need to connect to the UPS. Typically these will be servers, routers, switches, and storage arrays. With the number of devices noted, you can then proceed to identifying the UPS that can accommodate these. There are UPS systems with up to eight outlets.

2. How much power do you need to provide?

Along with the number of devices, you need to know how much power they need. You’ll just need to add up the total electrical load of all the equipment identified. The rule of thumb is to get a UPS with a power capacity that is 25% higher than your total power needed. The major manufacturers such as APC, CyberPower and Eaton have calculators on their websites where you select the devices you have and it will recommend a suitable UPS based on what is connected, how long you want them to run for and how much capacity for expansion you want.

3. Backup Runtime?

You also need to identify how much backup runtime you will need for your UPS. Generally a UPS is needed to have enough time to properly save files and shut down the equipment before a power outage. This will not take more than five minutes. And usually this is enough time for a backup generator to start and stabilise. Certain models can have additional battery packs connected to increase the run time. Depending on the load and the number of battery packs this could be many hours.

4. Types of UPS?

There are three types of UPS you can choose. Each offers different features that are best for different types of equipment.

  • The standby or offline UPS is the most commonly used UPS and is also the most economical. This is adequate for desktop computers or POS terminals but the batteries are generally quite small so they only provide backup power for a short time – around 10 to 15 minutes depending on the size and load.
  • The line-interactive UPS is the one we specify most often as they are the most flexible and provide a good trade-off between functionality and cost. These are the ones we generally supply for business and can have monitoring cards and external batteries added.
  • The online UPS, is the best type of UPS for providing clean power almost regardless of the input power. On these the input power simply runs a battery charger and the load is always running off inverted power from the batteries. They have now been developed so the efficiency is as good if not better than a line interactive model. Home theatre enthusiasts would be far better off with one of these providing clean power for voltage, frequency and noise rather than overpriced power filters that might eliminate a bit of noise but can do nothing for frequency or voltage.
5. Tower or rack mount?

UPS’s are generally available as either a tower or a rack mount. Manufacturers now also provide convertible models so they can be stood up on one side as a tower or mounted on rails in a rack. Tower UPS’s are the most common as they tend to be cheaper and are easier to fit in bigger batteries. Rack mount models can be as thin as 1U but these generally only provide a short run time – OK if you have an alternate power source such as a generator but not ideal if it is your only source of backup power. Also consider the airflow in your chosen location as higher temperatures will affect the life of the batteries.

6. Warranty?

Various companies offer different types of warranties for the UPS system and batteries they provide. As standard they are generally 2-3 years on electronics and 2 years on batteries. Some have sufficient faith in their product to provide advanced replacement warranty. Extended warranties are available and they are worthwhile as they will cover replacement batteries.

In making sure these six factors are covered, you can ensure you have the most ideal UPS that matches your needs. And with the right UPS system for your home or office you can be assured that your equipment will be protected in the best possible way. We are always available to advise on a suitable UPS to fit your needs. Contact us for assistance.

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Comments (4)

What is rack mount ?

Mounts in a standard 19 inch rack as opposed to standing upright in a tower configuration.

Hi. Your Blog is very informative. I really appreciate it. I have some points to mention which may be useful for the readers:
1. Is it important to purchase an UPS for my PC?
2. Gauge the upsides and downsides of purchasing an UPS for my PC.
3. What is the functioning season of the UPS?
4. What is the limit of the UPS?
5. Which is the best model for me to purchase?
After getting the above 5 questions, I think you can surely make a decision.

Thank you for your comment Pranav

In answer to your questions:

1) If you value your data and the reliability of your PC then a UPS is worthwhile.
2) Longer service life of components in your PC and no chance of corrupted data due to power failure versus the initial cost of the UPS and periodic battery replacement.
3) The accepted life of a UPS is 8 years with batteries required every 2-3 years. Obviously if the UPS experiences a voyage spike such as from a lightning strike then it needs to be replaced for continued protection of the connected devices.
4) There are many models in power ratings suitable for a single PC right up to ones that can run a whole data centre. The actual model needs to be determined by what you want to run and how long you want to run it for.
5) You can get very cheap standby models that look like overgrown power boards but our recommendation if you live in a city where the power quality is fairly good is to go for at least a line interactive model. It provides a much cleaner output than the standby model. If you are in a rural area where power quality is not as good or you want the best UPS available then a double conversion model is your choice.

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