IMPORTANT POINTS WHILE PURCHASING OF UPS OR INVERTER

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What is UPS?

UPS is an equipment that enables a computer or any low power consuming devices to continue working for a short or medium range of time when the main power source is dropped. It also can provide a safeguard from power surges.
Why UPS is necessary

In developing countries like Pakistan difference between demand and supply of electric power is mostly in the high range. In order to protect national grid power failure, power department imposes a plan of load shedding. Moreover tripping of electric power is also a major cause of burning sensitive equipment like computer and LCDs. In these circumstances, UPS or Inverter becomes an essential part of office and home
Points To be Considered While Selecting UPS

In case you have needed to buy a good Inverter or UPS, in that case, let us discuss the exact aspects that you simply must look into, always inquire with the vendor of UPS or Inverter and clarify to explain the points. These typically include the things you need to understand as well as examine before ordering the UPS/Inverter. There are two main kinds of UPS, primary type is known as On-Line UPS and the secondary is Off-Line UPS. A quick explanation of an ON-Line and Off-Line UPS.
On-Line UPS

On-line UPS is continuously controlling your mains electric supply after and during the charging of batteries attached to the UPS, on the breakdown in main electric supply it converts the battery’s DC supply into AC supply and energizes the selected electrical appliance with this AC supply. In this method, it is continually inverting the DC into AC without no need of any external switch for that reason this kind of UPS is called the online UPS.
Off-Line UPS

Off-Line UPS use to alter your load from direct supply to inverter supply, In this type of UPS a physical relay switching happens, a physical switching relay switch starts the inverter to produce the AC power from previously charged DC batteries to energize the selected appliances after the failure of power. Switching of this relay should be quite fast and must be within less tan 10 ms, on the other way computer system attached to this supply will restart upon switching. So it is known as the Off-line UPS. Upon restoration of man energy source relay cuts the connection of inverter from the electric appliance and energize them by the main source. After this procedure, main supply will automatically charge the batteries by the reverse action of the inverter.

Things to watch while finding out for UPS and Inverter, deeply examine these points prior to shopping of UPS or Inverter.
Which Power Capacity of UPS Will Suit You.

First of all, calculate the total load for equipment those will be energized via UPS and for what period they are assumed to be live in the case of failure of the main power source.
For an estimated calculation of load consumed by small household, equipment follow the ranges as below

A Ceiling Fan takes 75-90 Watts.
Room air cooler consumes about 250-300 watts.
Domestic fridges use power between 100 and 200 watts.
A split air conditioner with 12000 BTU 3500 watts.
A tube light takes 40-50 Watts.
A LED TV set take 30-100watts depending on size.
DVR box consumes 18 watts.
Desktop computer 120-250 watts.
Notebooks consume nearly 50watts.
Modems, WiFi routers, cell phone chargers take very low energy.
Mixer mill, juicer take up to 350 watts.
The iron takes 1000 watts.

Which Kind of Power Produced by UPS

If I needed to get a UPS, which sort of UPS will be suitable for my needs, the inverter with a sine wave, square wave or cosine wave output? As some sensitive computer related gadgets require a particular type of input electricity.
Points To be Asked by UPS Vendor

Present your requirements against the vendor he will evaluate the data provided by you and suggest you the best model of UPS according to your budget, but never forget to ask the following points before finalizing a purchase.

Which type of battery will be needed, the size of the battery, the voltage of the battery and normal battery, tubular battery or a maintenance free battery etc. must be in consideration.
What is meant by Watt and VA rating of an inverter or UPS?
The best way to use the Inverter or UPS to lengthen the actual battery life and working hours.
The way to calculate the battery backup in Hours, and battery power capacity in AH (Ampere Hour).
In the case of any fault in UPS what will be the visiting charges of company’s technician to check/remove the fault.What are the warranty/guarantee terms and conditions, and what are the elements included and for how much time period?
What type of wiring will be required for the installation of UPS and who will do this job? This is a good idea to arrange the electrician for this purpose how is recommended by the UPS vendor.
Clear that if some component is required to replace at the time of annual maintenance, who will afford the charges for that component, also the availability of spare parts in the local market.
What are the safety precautions should I consider for children at home to stay away from accidents.
What will be the suitable place or location to install the UPS at my premises for a better look after and safety.
Latest UPS and Inverter are equipped with a LED monitor panel in front of it. Understand all the indications reflecting on this panel. Normally is indicates charging status, low battery, load, input, and output voltages.

All these points are extremely important and you must consider or remember or ask your UPS/Inverter vendor person before acquiring your Inverter or UPS.

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