UPS, inverter, and generator all solve the same problem – keeping power on during an outage – but they work differently and suit different needs. Here’s how to tell which one is right for you.
UPS: instant, short-term backup
A UPS (uninterruptible power supply) switches to battery power within milliseconds of an outage, with zero downtime. That makes it the right choice for equipment that can’t handle even a brief interruption – servers, networking equipment, security systems, medical devices. Battery capacity is usually modest, giving you minutes to a few hours of runtime rather than days.
Inverter: whole-circuit backup for longer outages
A home inverter system is a larger-scale version of the same idea, wired into your DB board to power selected circuits – lights, wifi, TV, fridge – for the duration of a load shedding slot or longer. Inverters are usually paired with a larger battery bank than a UPS, and can be combined with solar panels to recharge during the day.
Generator: unlimited runtime, but not instant
A generator can run for as long as you have fuel, making it the only real option for extended outages, but it isn’t instant – there’s a changeover delay, and it needs to be started, fuelled and maintained. Generators also need proper installation with a changeover switch to prevent back-feeding power into the grid, which is a safety requirement, not optional.
Which do you actually need?
For scheduled load shedding, most homes are well served by an inverter system sized to the circuits that matter. For businesses that can’t tolerate any interruption to specific equipment, a UPS on that equipment is the right layer, sometimes combined with a generator or inverter for the wider building. For areas with frequent, unpredictable, or extended outages beyond normal load shedding, a generator adds resilience a battery system can’t match on its own.
Frequently asked questions
Can I combine a UPS, inverter and generator?
Yes – many commercial sites use a UPS for critical equipment, backed by a generator for the building as a whole, giving instant protection plus unlimited runtime.
Do inverter and generator installations need a compliance certificate?
Yes, both need to be installed and certified by a registered electrical contractor, and a generator specifically needs a changeover switch installed correctly to prevent it feeding power back into the grid.
How long does a typical home inverter system last on battery?
It depends on battery capacity and what’s connected, but most systems sized for essential circuits (lights, wifi, fridge) run for several hours per load shedding stage.
Not sure which setup suits your home or business? See our UPS installation service or get a free quote.