Uninterruptible Power Supplies

PS Units - Backup Power for Home / Office / Shop Use

With all the Mains Power cuts this year everyone is concerned with the quality of our future power supply. Is ESKOM maintaining the infrastructure sufficiently to ensure further power failures do not occur? We think not, and we have come up with a brilliant solution!

The PS Units provide Uninterruptible Power for a range of domestic and commercial items. It comes in an attractive case with a built in socket at the rear. It is portable and has a built in battery, battery charger and switch over facility. This means that when power supply is interrupted, the unit automatically switches over to battery power – without interruption to the connected appliances. When normal power is restored the unit will automatically switch back and recharge the built in battery.

Installation is as easy as 1,2,3 - 1) Plug Unit into the Wall, 2) Plug your appliances into the unit 3) Enjoy!!! The unit can also be hardwired to the house, this must be done by a qualified electrician.

Example Uses of PS Units

Office Equipment: Computers, Laptops, Printers,
Scanners, PABX, *Lights
Shop Equipment: Pay Point Tills, Barcode, Scanners, *Lights
Domestic Appliances: TV / Video / DVD, Decoder,
Radio / Stereo, Fridge / Freezer, Garage Door, Fish Tanks, *Lights
Security Implements: Electric Gate / Garage Motor, Electric Fence Energizer, Alarm Systems, *Lights

NB: Not all power requirements can be met by the PS Unit. Some sensitive equipment may not work with or may even sustain damage from the Modified Sine Wave Power. Consult an Electrician if you are unsure

*To run built in lights, you will need an electrician to wire them up. Alternatively, you can simply plug in lamps

Examples of Maximum Loads for PS Units & Inverters

Please note: These are estimates and may not correspond to your equipment.
All equipment should be checked for requirements prior to purchase

Examples of Watts Drawn by Common Appliances

Please note: These are estimates and may not correspond to your equipment.
All equipment should be checked for wattage prior to purchase

Backup Time – How Long will it Work For?

Estimated Backup Time

The formula to calculate backup time is Volts x Battery Amp Hours / Watts

This is further simplified when applied to the PS Units as follows;

PS300/600 1200/Watts Req. = Hours Backup (Take 80% of this answer)
PS1200 2400/Watts Req. = Hours Backup (Take 80% of this answer)

E.g. You have a PS300 and you want to run your PC and Injket Printer. You have checked and you have found out that your PC needs 170Watts and your printer needs 115Watts i.e. 285Watts in total. Your backup time is as follows ;
1200 / 285 = 4.2 Hours (Take 80%)

E.g. You have a PS600 and you want to run your TV, Decoder, DVD, 2 Lamps (Energy Saver Bulbs), 3 Outdoor Security Lights (wired up by your electrician) totaling 80 + 50 + 20 + 30 + 270 = 450 Watts total. Backup time is;
1200/450 = 2.7 Hours (Take 80%)

E.g. You have a PS1200 and you want to run the Freezer in the Garage, the Garage Door and 2 Outdoor Security Lights (wired up by your Electrician). Add them up ; 320 + 300 + 180 = 800 Watts total. Backup time is;
2400/800 = 3 Hours (Take 80%)

Actual Backup Time
Actual backup time depends on a variety of factors.

Your backup time may be longer as many appliances do not constantly draw the max rated watts. For example, your Fridge says it needs 200 Watts, but it only uses 200 Watts during it’s ‘duty cycle’ i.e when the compressor is running. When the compressor is off, it uses almost no power. A fridge that is running efficiently will cycle 50% compressor on, 50% compressor off. However a fridge may draw more power than stated if it is very full, opened a lot, in a very hot environment or not working efficiently. This would reduce backup time. Backup time may also be reduced if your battery bank is not fully charged, or if it is old and has begun to deteriorate.

Very Important: You should NEVER run your battery 100% flat. When the PS Unit begins to beep, it means that you have discharged your battery to a depth of 80% and you should now turn the unit off. Discharging your battery further will result in shortened battery life.

Please note: These are estimates and may not correspond to your equipment.
All equipment should be checked for wattage prior to purchase

Things to consider:

Before you purchase a home/farm/small business back-up power system you should consider the following facts. Backup systems and battery’s are very expensive and every appliance that you choose to run on the back up system which is not absolutely necessary can increase the cost of the backup system drastically. We therefore recommend that you carefully consider which appliances should run on the backup system after a power failure. Remember that all systems can be used as stand alone units or can be hard wired into the current electrical system by a qualified electrician.

Before we can size the correct back up system you must consider the following:

1. Which items are absolutely necessary to be run on the back up system after power failure?
2. Write down the power requirements of each appliance/item in WATTS, VA or Amps. These are normally found on the product labels on the appliance or in the appliance manual.
3. Calculate the total wattage of all items which will be run on the backup system.
4. Consider that the most applicable back up time will be for your area. In other words, how long are the power failures that you normally experience in your area.

Upgradeable System

This system does exactly the same as the PS Units, the only difference is that the system can grow with the needs of the customer and can be expanded more easily to suite jour every need, this system also allows for future upgrades to incorporate solar panels/power to power the system.

Installation of this unit is preferably by hard wiring to the current electrical system by a qualified electrician.