Quick answer
They solve different problems. A UPS protects individual devices — a computer, a router, network equipment — through a seamless switch-over lasting minutes, which is enough to save work and keep connectivity alive. An inverter with a battery powers selected household circuits for hours. Many homes genuinely need both: the inverter for the house, a small UPS for the network rack and the desk.
What you can do now
- 1Decide what must not blink at all, which is the UPS list, versus what must keep running for hours
- 2Check whether your inverter has a fast enough transfer time for computers; many do not
- 3Size a UPS on the actual wattage of the equipment, not on its outlet count
- 4Keep the router and fibre ONT on a UPS — connectivity is what people miss most in an outage
- 5Test both under real conditions before you rely on them
When to call a professional
Decide based on what you actually need to keep running and for how long. An installer can advise where the inverter's transfer time is too slow for sensitive equipment, which is exactly the gap a small UPS fills. Sizing both together avoids the common outcome of a large inverter that still lets the computer reboot at every switch-over.
Typical cost in Johannesburg
UPS R1,800–R4,500 · Inverter from R45,000
Indicative ranges only. We provide written, itemised quotes before any work.
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