3.5kVA Inverter Generator — Pure Sine Wave

The Most Practical Inverter Generator for SA Households

The 3.5kVA inverter generator is the most popular inverter generator size sold in South Africa for residential load shedding backup. It occupies the sweet spot between the 2kVA (which cannot run a microwave) and the 6kVA (which is heavier and more expensive for household use).

At 2.8kW continuous output, a 3.5kVA inverter generator runs a fridge and chest freezer simultaneously, a microwave briefly (900–1,200W), LED lighting throughout the house, Wi-Fi router and fibre ONU, a smart TV, laptop and device charging stations, and CPAP or other medical equipment.

Superior to Conventional 3.5kVA Generators

Power quality: pure sine wave output protects modern electronics and inverter compressors from the harmonic distortion produced by conventional generators. Noise: 58–65 dB at 7 metres versus 72–78 dB for an equivalent open-frame petrol model — the difference between a generator you can hear through a closed window and one you can only faintly detect. Fuel consumption: at 30–40% load, an inverter generator consumes 0.8–1.0 litres per hour compared to 1.5–2.0 litres for a conventional 3.5kVA unit.

Portability

Most 3.5kVA inverter generators weigh 28–42kg and include carry handles or a wheel kit. They can be moved by two people and are suitable for outdoor placement on a patio or garden during a load shedding slot.

Safety — Carbon Monoxide

All petrol-powered inverter generators produce carbon monoxide. The quiet, compact design can be deceptive — CO output at a given power level is similar to a conventional generator of equivalent capacity. Always operate outdoors. The generator must never be placed in a garage (even with the door open), under a covered patio without through-airflow, or near any window or door that could allow exhaust to enter the home.

Frequently Asked Questions

Q: Why is a 3.5kVA inverter generator more expensive than a 3.5kVA petrol generator?
A: Inverter generators contain additional electronics that add to manufacturing cost. The premium buys cleaner power, lower noise, better fuel efficiency, and greater safety for electronics. For households with laptops, modern appliances, and medical devices, the additional cost is justified.

Q: How long does a tank last at typical household load?
A: At 1,500–2,000W draw, a 3.5kVA inverter generator consumes approximately 0.9–1.2 litres per hour. A 5-litre tank lasts approximately 4–5 hours at this load level.