Types of UPS

There are different types of UPS and the following is a brief explanation of each:

Standby UPS (offline)

The Standby UPS is the most common, and most economical type of UPS available to consumers for the home or office. Typically, a standby UPS will range in capacity up to about 1000VA, and so they are generally best suited for just one computer and monitor. A standby UPS, sometimes also referred to as an 'offline UPS', is a filtered and surge protected power supply, with battery backup. The utility power is the primary source of electricity, and in the event of a power outage the internal battery becomes the secondary power source, supplying DC voltage to an inverter which converts DC voltage to 220V AC.The switch to battery power may take just an instant, but sensitive electronics can be affected by the momentary drop in power. The rule of thumb though is that most computer power supplies can handle a few milliseconds of 'hold up time', time where the PSU continues to function with no input.

Line Interactive UPS

A Line Interactive UPS under normal condition smoothens and to some degree regulates the input AC voltage by a filter and a transformer.It is typically sized up to 3000VA, and uses a combination inverter/converter to charge the battery backup, and convert DC to AC when a power outage occurs. The advantage of the Line-Interactive UPS design is that the inverter/converter which handles the switching between the regular (Eskom) 220V AC supply or battery source is always supplying voltage to the connected devices, so switching between regular supply or battery power is a lot smoother. Additionally, since this configuration provides voltage regulation, it allows the UPS to handle brownouts and moderate voltage spikes in a simple way by adjusting voltage to nominal levels.

Online UPS

Offers the best power regulation and supply of all the uninterruptible power supply styles. It's usually the most expensive because of the higher quality of the components and the pure sine wave electricity that it produces. The online UPS works by continually charging a battery which is connected to an inverter, which transforms the DC voltage into 220V AC. Typically available in sizes from 5000VA and up, the reason the online UPS is considered so ideal is that in the event of a power outage nothing happens; the batteries still supply DC voltage to the inverter, and the inverter still converts that DC to AC to supply the computers. The batteries will eventually loose power since they are no longer being charged, but there is no variation in the power, and no switching delays as with the other styles of UPS.


  • All prices exclude Delivery in South Africa
  • Door-to-door couriers available from R180-00
  • Most back-up power units are “plug and play” and don't require an electrician
  • Simply plug your existing electrical equipment into the output of the plug ‘n play UPS and carry on as normal
  • Light and some plugs circuits can be accommodated by our larger UPS products & installed by most electricians
  • Units automatically recharge the batteries when power is restored