2. Next the supported load has to be known; this will usually be expressed in KW - but a UPS has to be sized in KVA owing to load characteristics - check out individual products for this conversion.

3. This simple multiplication may not give the best result in UPS sizing; this is because a UPS that matches the load in 1:1 terms may not be able to withstand inrush currents when switching the load on or be able to recover quickly enough to be useful following a period of blackout. Our data sheets provide this information.

4. The Autonomy is the next consideration - how long does the unit have to hold up the load in the case of blackout? Forever is ideal but this cannot be achieved with batteries! You should consider your experience of site outages - and provide an autonomy accordingly. You should plan to shut down non-critical systems when the mains fails. In most data applications it is the data that has to be protected, the UPS can trigger an orderly shutdown of files after a programmable period - allowing a controlled and quick recovery. The SPower range includes many solutions with battery extensions for extended autonomies - with additional chargers where needed - call us to discuss your application.

5. Consider the load’s operating system - software allows close coupled integration of the mains supply, the UPS and the load equipment to provide a complete solution.

6. If in any doubt at all simply contact SPowerUK - we are here to help you regardless of the size and complexity of the application. We undertake a technical appraisal of all orders prior to acknowledgement.

7. Single phase units <= 3kVA are user configurable and installable, our manuals provide complete information, and powerful software is provided. For larger systems >3kVA, especially 3 phase applications get in touch with SPowerUK and we will make our experience and services available to you.