Modification of Fuel Input on Oil Fuel Electric Generator to Gas Fuel Engine

National energy demands continue to increase in 2050 in line with economic growth, population growth, energy prices, and government policies. During 2016-2050, the final energy demand growth rate could reach 5.3% per year. For this reason, alternative energy is needed to meet these needs. One of them is by modifying the generator engine that uses fuel oil (gasoline) with gas (LPG and Biogas) by using a 1250 watt generator set with the aim of knowing how effective the performance of the generator engine is after fuel changes are made. The modification of the engine generator is located in the way the fuel enters the combustion chamber, where the modification lies in the rubber boundary between the carburetor and the manifold installed in the main jet. The test time takes 20 minutes. The test uses no-load with 0.1 kg fuel consumption, 160 watts load with 0.1 kg fuel consumption, 350 watts load with 0.2 kg fuel consumption, and 700 watts load consumption with 0.2 kg fuel. For the use of biogas without load, the fuel consumption is 0.03 m3, with a load of 160 watts, the fuel consumption is 0.03 m3, while for larger loads, the engine is unable. From the results of testing on the modified generator set, the highest fuel consumption was obtained with 0.01 kg/minute LPG, and the consumption of fuel with biogas was 0.03 m3/min. From this test, it was concluded that in the material of fuel consumption (LPG), the power generated was 8.571 kW/hour at the cost of Rp. 12.573 and biogas 0.01125 kWh/hour at a cost of Rp. 16.