What size UPS do I need for a home PC, monitor and router in South Africa?

Size on watts, not VA. A desktop PC and monitor typically draw around 150-400W and a router adds a little more; total that, add 20-30% headroom, and keep the load under about 80% of the UPS's rated watts. That usually lands a single-PC setup in the 600-1000VA class. Multiple machines or a power workstation push you toward 1500VA and higher.

What is the difference between VA and watts on a UPS?

VA is apparent power and watts is real power; watts equals VA multiplied by the unit's power factor, typically 0.6-0.9 on consumer UPS models. Your equipment consumes real watts, so always compare against the watt rating when sizing. A '1000VA' unit might only deliver 600W, which is the number that actually matters for your load.

Should I buy a line-interactive or online double-conversion UPS?

Line-interactive units add AVR and switch to battery in about 2-4ms - the right balance of price and protection for most home and small-office PCs. Online double-conversion units continuously regenerate the power for zero transfer time and full isolation from grid disturbances, which suits servers, NAS and sensitive equipment. Standby (offline) units are cheapest and fine for basic PCs and network gear.

Do I need a pure sine wave UPS for my PC?

For a modern PC or server with an active-PFC (80 PLUS) power supply, yes - a simulated sine wave can cause the PSU to run hot, buzz or shut down when the UPS switches to battery, risking data loss. Choose pure sine wave for PCs and NAS devices. Simulated sine wave is acceptable for simple loads like a router or a basic office machine.

How long will a UPS run my PC during a power outage?

Runtime depends heavily on load: a unit rated for 30 minutes at half load may give only 5-10 minutes near full load. Decide whether you need just enough time for a safe shutdown, which a few minutes covers, or to keep working through a longer outage, which needs a larger unit or extended battery packs. Check the manufacturer's runtime chart at your actual wattage.

Can I replace the battery in my UPS, and how long do batteries last?

Most consumer UPS units use sealed lead-acid (VRLA) batteries rated for roughly 3-5 years; heat and frequent outages shorten that. Many models have a user-replaceable battery, so you can renew the cells instead of buying a whole new unit - match the voltage, amp-hour rating and terminal type to the original. Choosing a model with a replaceable battery lowers long-term cost.

What does AVR do on a UPS and do I need it?

AVR (automatic voltage regulation) corrects under- and over-voltage from an unstable grid without switching to battery, protecting your equipment from brownouts and surges while saving battery cycles. It is standard on line-interactive and online UPS units and worth having anywhere the grid is unreliable. Standby units generally rely on the battery instead, which wears it faster.

Which UPS brands does Evetech stock in South Africa?

Evetech carries UPS systems from brands such as APC, Mecer and RCT, spanning standby, line-interactive and online double-conversion topologies with both simulated and pure sine wave output. Choose the tier that matches your load and equipment sensitivity, and check the spec for AVR, a replaceable battery and USB monitoring before buying.

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Best UPS South Africa

UPS backup power systems for PCs and small offices in South Africa

UPS Systems for Backup Power & Surge Protection in South Africa

A UPS (uninterruptible power supply) keeps your PC, network gear and small-office equipment running through power outages and shields it from the surges and voltage swings common on an unstable grid. The right unit is sized by real watts, not just its VA rating, and matched to your kit: computers with active-PFC power supplies want pure sine wave output, while line-interactive or online double-conversion topology, AVR and a replaceable battery decide how well it handles brownouts and how long it lasts. Compare capacity, runtime and features below to pick a UPS that carries your load long enough for a safe shutdown, or keeps you working through the outage.

How to Choose a UPS in South Africa

Start with the real load you need to protect. Add up the wattage of the devices you want on backup - a typical desktop PC and monitor draw roughly 150-400W, a router and a few peripherals add a little more - then add 20-30% headroom and never plan to run a UPS above about 80% of its rated watts. Sizing on watts, not the marketing VA number, is the single most common mistake: a UPS carries both a VA figure and a lower watt figure (VA multiplied by its power factor, usually 0.6-0.9), and the watt figure is what your equipment actually consumes.

Every UPS lists two capacity numbers: VA (apparent power) and watts (real power), where watts equals VA multiplied by the unit's power factor - typically 0.6 to 0.9 on consumer models. Your equipment draws real watts, so size on the watt figure. Total the wattage of everything you want on backup, add 20-30% headroom, and keep the sustained load under about 80% of the UPS's rated watts. As a rough guide, a single PC and monitor plus a router usually fits a 600-1000VA class unit, while multiple machines or a workstation push you toward 1500VA and up.

Runtime falls steeply as load rises, so a UPS rated for 30 minutes at half load may give only 5-10 minutes near full load. Decide your goal first: enough time to save work and shut down safely (a few minutes is plenty), or riding out a longer outage (which needs a larger unit or extended battery packs). Manufacturers publish runtime charts per model - read them at your actual wattage rather than trusting the headline figure. For unattended equipment like a NAS, pair the runtime with automatic-shutdown software over USB.

Standby (offline) UPS units are the cheapest: they pass mains through until it fails, then switch to battery in a few milliseconds - fine for basic home PCs and network gear. Line-interactive units add AVR, correcting under- and over-voltage without draining the battery and switching over in around 2-4ms; this is the sweet spot for most home and small-office PCs. Online double-conversion units continuously rebuild the power from DC, giving zero transfer time and complete isolation from grid disturbances - the choice for servers, NAS and sensitive equipment, at a higher price and running cost.

On battery, a UPS outputs either a pure (true) sine wave or a stepped 'simulated'/approximated sine wave. Modern PC and server power supplies with active PFC can misbehave on a simulated wave - some run hot, buzz, or shut down and drop the load when the UPS switches to battery, risking the data loss a UPS is meant to prevent. For any PC with an 80 PLUS / active-PFC PSU, or a NAS, choose pure sine wave. Simulated sine wave is acceptable for simple loads like a router or a basic office PC where cost is the priority.

Most consumer UPS units use sealed lead-acid (VRLA) batteries rated for roughly 3-5 years; heat and frequent outages shorten that, so favour a model with a user-replaceable battery so you renew the cells instead of the whole unit. Confirm the outlet count and type (South African / IEC), and that AVR (automatic voltage regulation) is included to smooth voltage without cycling the battery. USB or serial monitoring plus shutdown software is worth having for PCs and servers so equipment powers down cleanly when the battery runs low.

Once the capacity is right, match the topology and waveform to how sensitive your equipment is and how long you need to stay up. Line-interactive units with AVR suit most home and small-office PCs; online double-conversion units suit servers, NAS and anything that cannot tolerate a switchover gap. Pure sine wave output matters for modern PC power supplies with active PFC. The five factors below break down each decision. Evetech stocks UPS systems from brands such as APC, Mecer and RCT across these tiers.

How to Choose a UPS in South Africa

UPS Systems for Backup Power & Surge Protection in South Africa

Choose the Right UPS for Backup Power & Surge Protection (3)

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Price Range

Elecstor ECO mini ELE-ECO1825 UPS

Elecstor-ECO TIT-ECO32700 Mini DC UPS

Promate PowerTank-600 600W Portable

Choose the Right UPS for Backup Power & Surge Protection (3)

Filters

Price Range

Elecstor ECO mini ELE-ECO1825 UPS

Elecstor-ECO TIT-ECO32700 Mini DC UPS

Promate PowerTank-600 600W Portable

How to Choose a UPS in South Africa

How to Choose a UPS in South Africa