The System Johansson Gas Producers work with a high gas producer output reduction of 6:1, as has been established with long term testing. With spark ignition the latter is based on zero power for turndown with the main switch off for short limited periods of time, in order not to damage the engine without any load. Then the full maximum power has been switched on instantaneously without the engine causing any drops in the revs.
The overall electrical power efficiency is dependent of the engine and alternator efficiencies, while the hot gas producer efficiency alone is about 80%, with cooled filtered gas efficiency being nearer 74%.

17. FUNCTION CONTROL

The combined effect from the removal of the excess fuel condensates, the primary air preheating and the on demand continuous char surplus as well as the automatic ash grate activation and high temperature of the refractory cast cement hearth, ensures that all tar is cracked at the long gas residence time. Also there is no variation in the gas heat value from when the fuel compartment is 100% full to when 75% of the fuel load has been burnt down. Although ash removal and refuelling can take place at any time while the engine is running, the 75% burned down fuel load limit when the flashing red fuel level warning light comes on, is the lowest safe fuel level allowed before refuelling.

The electronic fuel level indicators and refuelling warning system help to keep the operators informed about the fuel reserve. Through the red flashing warning light, which can be combined with a sound alarm, the operators are also reminded in good time when to re-fuel. The large capacity ash collector box is provided with an electronic ash level sensor, activating a flashing red warning light system, in order to warn the operator if the ash and duffing carbon should rise too high. It is however advisable to remove the ash and soot at more frequent intervals, which like re-fuelling is done without interruption to the power output.