"We Understand the Science of Power"


A UPS is an Uninterrupted Power Supply. Its prime function is the conditioning and stability of power


UPS - Offline

These type of UPS systems are of basic design. It provides limited protection in that any voltage variations or spikes are not regulated or filtered adequatly. The units only switch to battery backup mode after detection of power failure, usually 5-10ms later. Some sensitive loads may require better voltage stabilisation, hence choosing the correct UPS is important.

Offline UPS's are usually cost effective as they have less control circuits and ability. Your backup time is limited to minutes as they include one or two batteries at most. An offline UPS does not have the ability to connect additional batteries as the charger has limited power, should this be done your batteries will not charge resulting in premature battery failure. An offline UPS is only effective in applications if power failure occurs once or twice a week for 5-10 minutes.

UPS - Line interactive

These type of ups systems are better designed than offline units. They able to offer a higher quality voltage regulation and faster transfer times. Should the Eskom supply vary it utilises a transformer to increase or decrease the voltage to an acceptable level. In doing so the battery is not used as often resulting in increased battery life. More importantly the battery spends more time in a charged than discharged state ensuring greater readiness should a full power failure occur.

A line-interactive ups is therefore better suited to handle voltage surges, brownouts and power failures more effectivly. The backup times are better in the order of 15-30 minutes in standard configuration and may be extended to hours. Line interactive ups usually have intelligent (RS232) and comes with automatic shutdown software and serial cable.

UPS - Online

This type of UPS system will provide total protection and backup on power failure for critical applications. Your computer system is always running on electronically produced power and it is not directly connected to the utility supply. The double conversion, double isolation and the pure sinewave form output ensure the cleanest, most compatible AC output for computers and any other critical load.

Typical backup time are 15-30 minutes. You may increase backup times to several hours by connecting external batteries. Batteries may also be charged more effectively as it has sophisticated charger circuits and controls in place. This unit is intelligent (RS232) and comes with automatic shutdown software and serial cable.

This type of UPS System is aimed at the professional, medical/industrial and upper business market and is recommended when you have a very dirty, noisy & unreliable mains supply. It is also recommended for all critical applications. This type of system has the highest protection level available. Its usually higher in cost but provides greater service life.

Data sheets

Durapower DP1000SA - Static Transfer System | open | download.

Durapower DP3000M - UPS | open | download.

Net Agent II - UPS Monitoring | open | download.

UPS Rentals

As an economically viable solution for short-term and predictable service life, our UPS systems are particularly suitable for rental use. Depending on the required power, single-phase UPS systems from 1 kVA to 20 kVA and three-phase UPS systems from 10 kVA to 60 KVa are available. Rental periods may be structured from 1 month to 60 months.

Gallery - UPS Systems

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Gallery - Batteries

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