
| 
										 Type:  | 
									
										 Output Variable  | 
								
| 
										 Units:  | 
									
										 %  | 
								
| 
										 Symbol:  | 
									
										 ηgen,tot  | 
								
The generator average total efficiency is the average of the generator's total efficiency over a year, defined as the electrical plus thermal energy out divided by fuel energy in. HOMER uses the following equation to calculate the average total efficiency:

| 
										 where:  | 
									
										 
  | 
								|
| 
										 
  | 
									
										 Egen  | 
									
										 = the generator's total annual electrical production [kWh/yr]  | 
								
| 
										 
  | 
									
										 Hgen  | 
									
										 = the generator's total annual thermal production [kWh/yr]  | 
								
| 
										 
  | 
									
										 mfuel  | 
									
										 = the generator's total annual fuel consumption [kg/yr]  | 
								
| 
										 
  | 
									
										 LHVfuel  | 
									
										 = the lower heating value of the fuel [MJ/kg]  | 
								
We use 3.6 in the equation above because 1 kWh = 3.6 MJ.
See also: