Wacker Corp. has developed a new line of mobile generators for construction, rental, commercial and industrial applications. The mid-sized units of the new line, the G 50, G 70, and G 85 mobile generators, are available in trailer or skid- mounted versions and are all driven by John Deere diesel engines. They cover a continuous output range of 41 to 66 kW, with standby ratings of 45 to 72 kW.

"Primarily, we aim this new line at owners and rental users in the construction industry," said Dean Mathison, product manager, pump and power group for Wacker. "Secondary uses would be in the rental industry where rental houses are dealing with special events such as concerts and sporting events."

Another possible application, the company said, is standby power, where a rental house will be involved in servicing an existing standby installation. "Once or twice a year, they will go out and take a standby unit off line," explained Mathison. "They can then put one of our units in its place utilizing our standard two-wire hookup. While they service the other generator, ours can pop online if needed."

The G 50 gen-set has a standby output of 45 kW and continuous output of 41 kW. It is powered by an in-line, four-cylinder, air-cooled John Deere PowerTech 4045 DF 150 diesel engine rated 71 hp at 1800 rpm. The G 50 has a fuel tank capacity of 87 gal. offering over 26 hours of running time under a continuous load.

The G 70 gen-set, which has a standby rating of 62 kW, 57 kW continuous, is driven by a four-cylinder, air-cooled John Deere PowerTech 4045 TF 150 diesel rated 100 hp at 1800 rpm. The G 70's fuel tank also holds 87 gal. and offers almost 20 hours of uninterrupted running time under continuous load, Wacker said.

Rounding out the mid-sized range is the G 85 gen-set, rated 72 kW standby and 66 kW continuous. The unit is powered by the in-line, four-cylinder, air-cooled John Deere PowerTech 4045 TF 250 diesel engine rated 113 hp at 1800 rpm. Its 87 gal. fuel tank supplies over 17 hours of running time under a continuous load.

All of the engines drive Marathon generators, with Basler Electric voltage regulators. Wacker sizes the generators to be engine limited, not generator limited. This, the company said, allows full utilization of engine horsepower. Mathison also explained that this is done to ensure against overcurrent or overdraw situations.

The engines also include Racor Crankvent crankcase vapor recirculation systems, which recycle crankcase air and oil mist back into the oil pan after being filtered, allowing no oil to accumulate outside the unit. The engines are also equipped with a mixture of critical and industrial grade Cowl silencers designed to achieve noise levels below 70 dB(A). Radiators are coupled to the unit by Wacker to meet Deere's air-to-boil tests and are customized to exceed them.

Each of the gen-sets feature a digital engine/generator controller with LCD display supplied by Control, Inc. The control panel monitors generator output, battery voltage, coolant temperature, oil pressure, fuel level, engine speed and engine hours for accurate operating information. Wacker said the LCD display was implemented to eliminate troubleshooting time by providing the operator with fault messages in the case of automatic shutdown. The units are designed to shutdown for low oil pressure, high coolant temperature, engine over- and under-speed, and low fuel level.