Pramac GGW 35 G 400V gas generator

The Pramac GGW 35 G 400V is an industrial gas generator designed for facilities requiring a reliable three-phase power supply that strikes the right balance between power output, operational stability and ease of long-term operation. The model is well suited for backup or primary power supply to commercial buildings, technical facilities, service centres, engineering infrastructure, small production facilities and sites where it is important to have a ready source of energy without the typical problems associated with diesel fuel and its storage.

The generator operates on a three-phase 400/230 V network at a frequency of 50 Hz and has a maximum power output of 28.0 kW in LTP standby mode and 26.0 kW in PRP mode. This range makes the model suitable not only for emergency backup but also for longer-term use under variable loads, where a stable power supply is required for three-phase equipment, ventilation systems, pumps, automation, workshops, technical facilities or small commercial complexes.

At the heart of the unit is a 4450 cc Generac 4-cylinder in-line engine. This is a naturally aspirated gas engine with electric start, a rated speed of 1500 rpm and liquid cooling, which is well suited for stable, long-term operation. Unlike small domestic gas models, this unit represents a different class of equipment: a more robust power platform, liquid cooling, stationary industrial applications and a focus on real-world loads rather than just domestic backup.

The model runs on natural gas or LPG, which offers greater flexibility when designing the fuel supply system. If natural gas is available on site, the generator can operate for long periods without refuelling. If it is more convenient to use LPG, this option is also available. At 100% load, fuel consumption is 14.4 m³/h for natural gas or 4.8 m³/h for LPG, and at 75% load — 12.1 m³/h or 4.0 m³/h respectively. This provides clear guidelines for designing the gas line and estimating future operating costs.

The generator section is provided by a Mecc Alte ECP 32-1S/4 C alternator. It features a brushless design, insulation class H, 4 poles, IP23 protection rating and an electronic voltage regulation system with a standard AVR DSR. This is important for stable operation under load, especially when sensitive loads or equipment with significant current fluctuations during operation are connected to the generator.

A particular strength of the GGW 35 G is its level of control and protection. The unit is equipped with a Power Zone Pro controller, which offers significantly more capabilities than basic display functions. It features a 4.3-inch colour touchscreen display, a choice of interface languages, monitoring of key parameters, a history log, diagnostics, programmable inputs and outputs, the ability to connect expansion modules and an external display, and remote monitoring via Modbus RTU, Modbus TCP/IP and Ethernet. The screen displays three-phase voltage, current, kW, kVA, kVar, frequency, motor speed, coolant temperature, oil pressure and temperature, battery voltage, motor hours, faults and service information.

In terms of protection, this model also looks very robust. Warnings and alarms are provided for high and low oil pressure, coolant level and temperature, oil temperature, overload, overvoltage and undervoltage, over- and under-frequency, current overload, battery issues, short circuits and other critical conditions. This is important for industrial applications, as the generator must not only generate electricity but also protect itself and the connected load in a timely manner.

The standard specification includes a number of useful technical features: an oil drain pipe, a reinforced air filter, a fan guard, a stainless steel bellows, factory-filled with oil and coolant, a redundant gas cut-off valve, an electronic pressure regulator, stoichiometric rich-burn mixture formation with lambda probe control, a closed-loop liquid cooling system, a radiator mounted on the frame, an electromagnetic starter, EFI, and vibration mounts for the engine and alternator. The enclosed version features sound-absorbing material, sealed doors, a galvanised steel housing, a pre-chamber with an integrated silencer, and upward-facing air and exhaust outlets.

The Pramac GGW 35 G 400V is available in both an open version and a sound-insulated enclosure. The enclosed version has a noise level of 67 dB at a distance of 7 m and 96 dB LWA, making it significantly more suitable for sites where acoustic comfort and a neater, fixed installation are important. Thanks to the combination of a gas platform, an industrial controller, Mecc Alte, liquid cooling and a comprehensive set of safety features, this model appears to be a very robust solution for mid-range commercial and engineering backup applications.