£6,300 Ex Works + VAT
£6,300 Ex Works + VAT
The GBW22P is a compact 22 kVA silent diesel generator delivering dependable three-phase power through a simple manual key-start control panel. Combining a UK-built Perkins Stage V engine, Mecc Alte alternator, sound-attenuated canopy and versatile socket outlets, it is well suited to construction, commercial, agricultural and industrial applications.
Rated at 22 kVA / 17 kW for emergency standby power and 20 kVA / 16 kW for prime operation, the GBW22P provides a practical balance of output, portability and fuel efficiency. It produces a 400V three-phase supply at 50Hz with a 0.8 power factor.
The standby rating is intended for variable electrical loads during a mains power failure, subject to the operating limits defined by ISO 8528. Its prime rating supports unlimited annual operating hours with a variable load, provided the specified maintenance procedures and permissible average-load limits are observed.
As a 20 kVA generator at its prime rating, this model can power suitable equipment for extended periods where the mains supply is unavailable. Buyers comparing it with a 15 kW generator also gain additional capacity for load fluctuations and equipment starting demands, although every installation should be sized using the combined running and starting currents of the connected loads.
At the heart of the GBW22P enclosed generator is a Perkins 404J-22G engine. This UK Perkins four-cylinder engine has a 2220cm³ displacement and uses natural aspiration, water cooling and a mechanical speed governor. It runs at 1500rpm and meets Stage V exhaust-emissions requirements at 50Hz.
The proven engine configuration avoids the added complexity of turbocharging while providing the power required for this compact generator set. A thermostatically controlled cooling system incorporates a mounted radiator, belt-driven coolant pump and pusher fan to manage engine temperature during operation.
Further engine features include:
The combination of a naturally aspirated UK-built Perkins engine and mechanical governing makes the GBW22P straightforward to operate and maintain. Its Stage V classification is also an important consideration for buyers working in markets or applications where regulated non-road engine emissions apply.
The Perkins engine is coupled to a Mecc Alte ECP28-M4 C brushless alternator. Designed for 400V, 50Hz operation, the four-pole alternator features Class H insulation, IP23 protection and an efficiency of 88.2% at 75% load.
A digital DSR automatic voltage regulator maintains voltage accuracy within ±1% under the stated operating conditions. This stable regulation helps the 16 kW generator deliver consistent power as loads change, although the suitability of sensitive equipment should always be confirmed before connection.
The alternator uses a 2/3-pitch stator winding, which helps suppress triplen harmonics and reduce excessive neutral currents associated with some non-linear loads. Its separate MAUX auxiliary winding can provide 300% forced current for up to 20 seconds. This supports short-duration motor-starting requirements, but the starting current and method of each motor should still be assessed when sizing the generator.
This GBW22P MCP model is supplied with a generator-mounted manual control panel. A keyed start and stop selector provides direct control of the engine, with a glow-plug preheating function included for cold starting. Analogue instrumentation gives the operator clear access to essential information through a voltmeter, ammeter and running-hours counter.
The MCP output panel includes:
The generator has a maximum output current of 31.76A per phase and is protected by a 32A circuit breaker. This makes the GBW22P particularly useful as a three-phase diesel generator for equipment connected through industrial sockets. Single-phase loads can also be supplied from the designated 230V outlets, but they should be distributed carefully to maintain reasonable phase balance.
Because this is the MCP key-start variant, an operator must start and stop the generator manually. For standby use, it should be incorporated into an appropriately designed electrical system with safe isolation and changeover equipment installed by a competent electrician. It is not intended to start automatically when the mains supply fails.
The manual panel monitors several conditions that could damage the engine or generator. Alarm functions cover battery-charging failure, low oil pressure, high engine temperature and earth faults. Shutdown protection responds to battery-charging failure, low oil pressure and excessive engine temperature, while the circuit breaker protects the electrical output.
A prominent emergency stop provides an immediate means of shutting down the set. These protections do not replace correct installation, earthing, load assessment or routine maintenance, but they add valuable safeguards for day-to-day operation.
The GBW22P silent enclosure combines polyurethane sound-attenuation material with an internal residential silencer. It achieves a noise pressure level of 66dB(A) at 7m and a guaranteed sound power level of 95dB(A) LWA.
Its single-piece hinged canopy is supported by pneumatic arms, allowing broad access to the engine and alternator for inspection and servicing. Integrated handles assist with opening, while a central lifting eye simplifies appropriately planned handling operations. Anti-vibration mountings isolate the generator set from its welded steel base frame, helping reduce transmitted vibration.
At 1645mm long, 870mm wide and 1060mm high, the GBW22P canopied model has a relatively compact footprint for its output. Its dry weight is 546kg, so suitable lifting equipment and a properly rated base or transport arrangement must be used.
A 51-litre integrated plastic fuel tank supports practical operating periods without making the generator unnecessarily large. The tank includes a filler neck, air breather and external refilling point, while a visual fuel-level indicator helps operators monitor the available supply.
At 75% of prime load, fuel consumption is approximately 4.00 litres/hour, providing up to 12.75 hours of running time. At 100% prime load, the GBW22P consumes approximately 5.56 litres/hour and offers around 9.17 hours of autonomy.
Real-world consumption will vary with electrical demand, operating conditions, maintenance and fuel quality. Correct generator sizing is important: consistently running a diesel generator at very light load can be undesirable, while insufficient capacity may lead to overloads or poor motor-starting performance.
The GBW22P is suited to buyers who need a robust manual-start power source with both three-phase and single-phase socket access. Typical applications include construction equipment, workshops, farms, mobile service operations, planned maintenance, temporary commercial power and backup for smaller premises.
Its combination of a Perkins diesel engine, stable alternator output and soundproof canopy also makes it a strong choice where a conventional open generator would create excessive noise. Before purchase, the connected load, starting currents, operating environment, emissions requirements, earthing arrangement and required protection should all be reviewed.
For buyers seeking a compact 17 kW diesel generator for emergency use or a 20 kVA silent generator for variable prime loads, the Pramac GBW22P provides a well-integrated solution with accessible controls, industrial socket outlets and service-friendly construction.
* at 100% prime rated load
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