Generators
UPS vs Inverter vs Generator: Which Backup Power Is Right for You?
Short answer
A UPS gives seconds to minutes of backup so computers and networks do not crash. An inverter with batteries runs lights, TV, Wi-Fi and a fridge for hours. A generator supplies large loads for as long as it has fuel. Many sites use a UPS for IT, an inverter or solar hybrid for essentials and a generator for heavy loads.
Comparison
| UPS | Inverter + battery | Generator | |
|---|---|---|---|
| Typical runtime | Minutes | Hours | As long as fuel lasts |
| Switch-over | Instant | Very fast | Seconds, manual or automatic |
| Best for | Computers, servers, routers, tills | Lights, TV, fridge, Wi-Fi | Workshops, pumps, whole buildings |
| Noise | Quiet | Quiet | Loud unless in a canopy |
| Running cost | Low | Low, from grid or solar | Fuel and servicing |
How to choose
- List what must keep running and for how long.
- Total its power (watts) and energy (watt-hours).
- Decide the longest outage you want to cover.
- Compare running costs. See solar vs generator.
Mix and match
A hybrid solar system gives both savings and backup, and a generator with correct sizing covers extreme outages. Ask us about generators and solar.
Common questions
Can a UPS run a fridge?
Small UPS units are not designed for motors. Use an inverter or generator for fridges.
Is an inverter cheaper than a generator?
Often for small loads and frequent short outages, yes. For heavy loads or long outages, a generator may be cheaper.
How long will my battery last?
Divide battery usable watt-hours by the load in watts, then allow for losses.