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This page allows you to calculte the battery size you will need. Enter the equipment usage values you want to add onto your UPS, and press the calculation button. Very user friendly!


 Penlight Battery charger 4 x Penlight batteries

 9 watts

 Household Light Bulb - Energy Saver with 11Watt

 11 watt

 Household Light Bulb - Incandescent with 60Watt

 60 watt

 Ink jet printer

 120 - 150 watt

 CRT Monitor 17"/19" screen

 180 - 300watt


 180 - 350 watts


 180 - 250 watt

 Laser jet printer

 250 - 780 watt

 PABX (5x10)

 150 - 200 watt

 Television, Satellite dish, Decoder, DVD Total

 290 - 400 watt

 Garage Door Motor

 300 - 500 watt

 Gate Motor

 300 - 500 watt

 4-in-1 Laser Jet printer/copier/scanner

 750 - 950 watt


 300 - 800 watt

 Fish tank pump + heater etc.

 1100 watt

 Fax - Copier - Printer

 750 - 1000 watts


 1200 watt

 Air conditioner

 3500+ watt


Battery size needed calculator

Appliance Watts   Amp hour
Hours for power back up - time required?
We’re also catering for a 90% effecency in inverter, baterry and charger
You need a Amp Hour battery


Equipment Power Usage

The power drawn by computing equipment is expressed in Watts or Volt-Amps (VA). The power in Watts is the real power drawn by the equipment. Volt-Amps are called the "apparent power" and are the product of the voltage applied to the equipment times the current drawn by the equipment. Both Watt and VA ratings have a use and purpose. The Watt rating determines the actual power purchased from the utility company and the heat loading generated by the equipment. The VA rating is used for sizing wiring and circuit breakers. The VA and Watt ratings for some types of electrical loads, like incandescent light bulbs, are identical. However, for computer equipment the Watt and VA ratings can differ significantly, with the VA rating always being equal to or larger than the Watt rating. The ratio of the Watt to VA rating is called the "Power Factor" and is expressed either as a number (i.e. 0.7) or a percentage (i.e. 70%).

Example #2: Consider the case of a 1000VA UPS. The user wants to power a 900VA file server with the UPS. The file server has a Power Factor Corrected power supply, and so has a Watt rating of 900W and a VA rating of 900VA. Although the VA rating of the load is 900VA, which is within the VA rating of the UPS, the UPS will not power this load. That is because the 900W rating of the load exceeds the Watt rating of the UPS, which is 60% of 1000VA or around 600W.

Ensure correct loading of your UPS

Equipment nameplate ratings are often in VA, which makes it difficult to know the Watt ratings. If using equipment nameplate ratings for sizing, a user might configure a system, which appears to be correctly sized based on VA ratings but actually exceeds the UPS Watt rating. By sizing the VA rating of a load to be no greater than 60% of the VA rating of the UPS, it is impossible to exceed the Watt rating of the UPS. Therefore, unless you have high certainty of the Watt ratings of the loads, the safest approach is to keep the sum of the load nameplate ratings below 60% of the UPS VA rating. Note that this conservative sizing approach will typically give rise to an oversized UPS and a larger run time than expected. If optimization of the system and an accurate run time are required, call our power experts who have the ability to accurately size your UPS.


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