The Könner & Söhnen KS 3300i is a compact open-frame petrol inverter generator with a stable 230V pure sine wave output. It delivers 3.0kW rated power and 3.3kW maximum power for compatible tools, appliances and sensitive electronics. Manual starting, Economy Mode and a 25.5kg net weight make it a practical portable option for workshops, camping and backup use.
Free delivery to mainland Great Britain only.
At a glance
| Rated / maximum output | 3.0kW / 3.3kW |
|---|---|
| Output | 230V, 50Hz pure sine wave |
| Starting | Manual recoil |
| AC sockets | 2 × UK 13A household sockets — both 230V |
| Fuel tank | 7 litres |
| Noise | 71dB(A) at 7m / 96dB(A) sound power |
| Net weight | 25.5kg |
| Gross dimensions | 450 × 380 × 460mm |
Why choose the KS 3300i?
- Pure sine wave inverter output: provides a stable 230V, 50Hz supply for compatible sensitive electronics as well as conventional appliances.
- 3.0kW rated output: supports a useful mix of portable equipment while retaining a compact open-frame design.
- Two UK household sockets: connect compatible 230V loads without a Commando adapter.
- Economy Mode: reduces engine speed at lighter loads to help lower fuel use and noise.
- Clear operating information: the LED display shows voltage, frequency and working hours, with separate oil, overload and voltage indicators.
- Copper-wound alternator: designed to tolerate load changes and support long service life.
- Built-in protection: includes overload protection, automatic low-oil shutdown and a reset function.
- Portable construction: 25.5kg net weight, compact dimensions and vibration-isolating support feet.
Power, fuel and connections
Plan loads around rated power
Use 3.0kW as the continuous rating and allow for appliance starting surges. The manual advises keeping prolonged loads within 80% of rated output — approximately 2.4kW — to support service life.
Petrol setup
Use unleaded petrol with an octane rating of 90–95 and no more than 10% ethanol. Add suitable four-stroke engine oil before the first start.
Connections and limits
The control panel provides two UK 13A household sockets and a 12V/8.3A DC outlet. This model has no ATS input and no generator parallel socket.
Technical specifications
| Voltage | 230V |
|---|---|
| Frequency | 50Hz |
| Rated output | 3.0kW |
| Maximum output | 3.3kW |
| Maximum current | 14.4A |
| Power factor | 1.0 |
| AC sockets | 2 × UK 13A household sockets — both 230V |
| DC output | 12V / 8.3A |
| Output waveform | Pure sine wave |
| LED display | Voltage, frequency and working hours |
| Fuel | Petrol |
|---|---|
| Engine | KS 210i, single-cylinder four-stroke, air-cooled |
| Engine capacity | 208cm³ |
| Engine power | 5.5hp |
| Starting | Manual recoil |
| Fuel tank | 7 litres |
| Engine oil capacity | 0.6 litres |
| Alternator winding | Copper |
| Emissions standard | EURO 5 |
| Gross dimensions (L × W × H) | 450 × 380 × 460mm |
|---|---|
| Net weight | 25.5kg |
| Gross weight | 28.0kg |
| Sound pressure at 7m | 71dB(A) |
| Sound power | 96dB(A) |
| Protection class | IP23M |
Before first use
Add engine oil before starting. The generator is supplied without engine oil or petrol. The manufacturer recommends SAE 10W-30 or SAE 10W-40 four-stroke engine oil. Check the oil level before every use and follow the manual's starting procedure.
Manuals and downloads
Warranty
Manufacturer's warranty: 1 year or 1,000 operating hours, whichever comes first, from the date of purchase.
The warranty covers manufacturing defects, subject to the manufacturer's warranty conditions. Eligible faults may be repaired or the product replaced. Retain your proof of purchase and any completed warranty documentation supplied with the generator.
For help with a warranty claim, contact Energian with your order number, generator serial number and a description of the fault.
Frequently asked questions
Is the KS 3300i suitable for sensitive electronics?
It produces a pure sine wave output designed for compatible sensitive electronics. Check the equipment's running and starting requirements and allow a suitable power margin.
How much power should I use continuously?
The rated output is 3.0kW. For prolonged operation, the manual recommends keeping the load within 80% of rated power, approximately 2.4kW.
Can it start automatically during a power cut?
No. The KS 3300i has manual recoil starting and no ATS connection.
Can it be connected in parallel with another generator?
No. The KS 3300i control panel does not have a generator parallel socket.
Is engine oil included?
No. Add suitable SAE 10W-30 or SAE 10W-40 four-stroke engine oil before the first start and check the level before each use.
Energian support
For help choosing a generator contact Energian on 020 8064 0335 or info@energian.co.uk. For after-sales support, have your order number and generator serial number ready.