The K&S Basic KSB 18i S is a compact petrol inverter generator delivering 1.8kW rated power and 2.0kW maximum power at 230V. Its pure sine wave inverter output, sound-insulated housing, economy mode and 18kg weight make it a practical portable supply for compatible electronics, camping, leisure and light backup use.
Free delivery to mainland Great Britain only.
At a glance
| Rated / maximum power | 1.8kW / 2.0kW |
|---|---|
| Output | 230V, single phase, 50Hz; pure sine wave inverter |
| AC socket | 1 × UK 13A household socket, 230V |
| Starting | Manual recoil |
| Fuel tank capacity | 4 litres |
| Net weight | 18kg |
Why choose the KSB 18i S?
- Pure sine wave inverter: provides stable 230V output for compatible sensitive electronics and general portable power applications.
- Sound-insulated housing: produces a stated sound pressure level of 70dB LpA at 7 metres.
- Economy mode: reduces engine speed under light loads to help lower fuel consumption.
- Parallel connection: two compatible KSB 18i S generators can be linked with a KSB PC-1 cable to increase available output.
- Clear status indicators: low-oil, working-mode and overload indicators support straightforward operation.
- Copper-wound alternator: a brushless permanent-magnet alternator with 100% copper windings.
- Compact and portable: the enclosed 18kg body includes an integrated carrying handle.
Power, fuel and connections
Plan your load
Use the 1.8kW rated output and allow for motor starting loads. The manual recommends keeping continuous loads at or below approximately 1.44kW, equal to 80% of rated power.
Petrol and economy mode
Use fresh unleaded petrol rated 90–95 octane with no more than 10% ethanol. Start with economy mode off; use it only after starting and with loads up to 20% of rated power.
Parallel connection
Two matching KSB 18i S generators can provide up to 3.4kW combined rated output using the KSB PC-1 parallel cable. The cable is sold separately; do not mix generator models.
Technical specifications
| Rated / maximum output | 1.8kW / 2.0kW |
|---|---|
| Voltage / frequency / phase | 230V / 50Hz / single phase |
| Waveform / power factor | Pure sine wave / 1.0 |
| Maximum current | 8.7A |
| AC socket | 1 × UK 13A household socket, 230V |
| Parallel connection | Supported; KSB PC-1 cable required (not included) |
| ATS input | No |
| Fuel | Petrol |
|---|---|
| Engine | KSB 90i; single-cylinder, four-stroke, air-cooled |
| Displacement / engine power | 79cm³ / 3hp |
| Starting system | Manual recoil |
| Fuel tank capacity | 4 litres |
| Engine oil capacity | 0.35 litres |
| Recommended oil | SAE 10W-30 or SAE 10W-40, API SG or higher |
| Sound pressure / sound power | 70dB LpA at 7m / 95dB LWA |
|---|---|
| Protection rating | IP23M |
| Product dimensions (L × W × H) | 400 × 260 × 450mm |
| Packed dimensions (L × W × H) | 500 × 335 × 510mm |
| Net / packed weight | 18kg / 20kg |
Sound pressure measured at a stated distance and sound power are different measurements and should not be compared directly.
What's included
- K&S Basic KSB 18i S inverter generator
- 13A plug
- Spark-plug wrench
- PH2 6.0mm screwdriver
- Oil filling funnel
- Owner's manual
Engine oil, petrol, appliance leads and the KSB PC-1 parallel connection cable are supplied separately.
Before first use
The generator is supplied without engine oil or petrol. Add 0.35 litres of the recommended four-stroke engine oil and check the level before starting.
Operate outdoors only, away from doors, windows and vents. Never use a petrol generator inside a home, garage, shed, vehicle, tent or other enclosed or partly enclosed space because exhaust fumes contain deadly carbon monoxide.
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. Retain your proof of purchase and follow the required operating and maintenance instructions.
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 it suitable for sensitive electronics?
It uses inverter technology to produce a pure sine wave. Check the requirements of the equipment you intend to power and keep the total load within the generator and socket limits.
Can two KSB 18i S generators be connected together?
Yes. Two matching units can be connected using the KSB PC-1 parallel cable, sold separately. The manufacturer's stated 0.2kW parallel loss gives up to 3.4kW combined rated output.
Is the KSB 18i S ATS compatible?
No. This is a manual-start portable generator and does not have an ATS input.
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.