The Könner & Söhnen KS 4000iE S is a petrol inverter generator with a stable 230V pure sine wave output for compatible sensitive electronics. It provides 3.5kW rated power and 4.0kW maximum power, with electric and recoil starting, a sound-insulated enclosure and integrated wheels for easier movement.

Free UK delivery. Orders are dispatched within 1–3 days and delivered within 5–8 days.

At a glance

Könner & Söhnen KS 4000iE S physical specifications: 40 kg net weight and 620 × 440 × 510 mm net dimensions

Könner & Söhnen KS 4000iE S technical specifications: 3.5 kW rated, 4.0 kW maximum and 230 V pure sine wave output

Key specifications
Rated / maximum power	3.5kW / 4.0kW
Output	230V, 50Hz pure sine wave
Sockets	2 × UK 13A household sockets — both 230V
Starting	Electric and recoil
Runtime at 50% load	7.8 hours*
Fuel tank	12 litres
Net weight	40kg

*Fuel consumption and runtime vary with load, fuel quality, season, altitude and generator condition.

Why choose the KS 4000iE S?

Pure sine wave output: stable 230V, 50Hz power for compatible sensitive electronics.
Electric and recoil starting: flexible starting options with a 1.6Ah starter battery.
Economy mode: reduces engine speed at lighter loads to lower fuel consumption.
Multifunction display: shows load, fuel level, voltage, frequency and operating hours, with status indicators.
Parallel-ready: compatible with the separately available KS PU1 parallel unit.
ATS-ready: an 8-pin connection supports the separately available KS ATS 4/25 Gasoline automatic transfer switch.
Integrated transport system: wheels and a lifting handle make the 40kg generator easier to reposition.

Power, fuel and connections

Plan for rated power

Use the 3.5kW rated output for normal load planning. The 4.0kW maximum rating is for short starting peaks rather than continuous operation.

Petrol operation

Use unleaded petrol rated 90–95 octane with no more than 10% ethanol. The generator is supplied without fuel or engine oil.

Optional connections

The generator supports compatible parallel operation and the KS ATS 4/25 Gasoline unit. Both accessories are purchased separately.

Technical specifications

Electrical output
Voltage / frequency	230V / 50Hz
Rated power	3.5kW
Maximum power	4.0kW
Maximum current	17.4A
Power factor	1
AC sockets	2 × UK 13A household sockets — both 230V
DC output	12V / 8.3A
Parallel connection	Yes — compatible KS PU1 unit required
ATS connection	Yes — compatible KS ATS 4/25 Gasoline unit required
Protection class	IP23M

Engine and fuel
Engine	KS 240i, 223cm³, single-cylinder four-stroke petrol, air-cooled
Engine power	7.5hp
Starting	Electric and recoil
Fuel tank	12 litres
Runtime at 50% load	7.8 hours*
Crankcase capacity	0.6 litres
Starter battery	1.6Ah
Alternator winding	Copper

Size, weight and noise
Net dimensions (L × W × H)	620 × 440 × 510mm
Packed dimensions (L × W × H)	630 × 475 × 570mm
Net / gross weight	40kg / 43.4kg
Noise level	66dB(A) at 7m / 91dB(A) sound power

*Fuel consumption and runtime vary with load, fuel quality, season, altitude and generator condition.

What’s included

KS 4000iE S inverter generator
Spark plug wrench
PH2 screwdriver
Accessory case
Operating instructions

Before first use

The generator is supplied without engine oil or petrol. Do not start it until the correct oil has been added.
Use four-stroke petrol engine oil; the manufacturer recommends SAE 10W-30 or 10W-40.
Use unleaded petrol rated 90–95 octane with no more than 10% ethanol.
Operate outdoors in a well-ventilated area on a firm, level surface, away from doors, windows and combustible materials.
Read the owner’s manual before starting, and connect appliances only after the engine is running steadily.

Manuals and downloads

English owner’s manual

KS 4000iE S inverter generator owner's manual

English · PDF · includes KS 4000iE SOpen PDF

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 Ordana with your order number, generator serial number and a description of the fault.

Frequently asked questions

Is the KS 4000iE S suitable for sensitive electronics?

Yes. Its inverter system produces a stable 230V, 50Hz pure sine wave output. Always keep the connected load within the generator’s ratings.

Can it start automatically during a power cut?

Yes, when installed with the separately available KS ATS 4/25 Gasoline automatic transfer switch. Any connection to fixed wiring must be completed by a qualified electrician.

What sockets does it have?

It has two 230V UK 13A household sockets, plus a 12V / 8.3A DC output.

Does it include oil or petrol?

No. Add the correct four-stroke engine oil before first use and fuel it with suitable unleaded petrol.

Ordana support

For help choosing a generator contact Ordana at Contact@ordana.shop. For after-sales support, have your order number and generator serial number ready.

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Könner & Söhnen KS 4000iE S Petrol Inverter Generator