Step 7 Performance Ratio

7.1 Predicted Performance Ratio

PR predicted Predicted performance ratio(decimal)

Yf predicted Predicted final system yield from simulation software (kWh/kW) or (kWh/kWp), also can said the unit is hour

PSHi predicted Predicted Peak sun hour, hours when solar irradiance at 1000 W/m² (1 kW/m²), which is considered "full sun" (hour)

• From Step 2 Peak Sun Hour >> 2.1 Predicted plane-of-array PSH per annum,  PSHi predicted = 1688h

• From Step 6 Final System Yield >> 6.1 Predicted Final System Yield, Yf predicted = 1278 kWh/kW per annum = 1278 h

• PR predicted = 1278/1688 = 0.7571

7.3 Measured Performance Ratio

PR measured Measured performance ratio(decimal)

Yf measured Measured final system yield from measurement (kWh/kW) or (kWh/kWp), also can said the unit is hour

PSHi measured Measured Peak sun hour, hours when solar irradiance at 1000 W/m² (1 kW/m²), which is considered "full sun" (hour)

According to SEDA, PR measured is accepted if PR measured > 0.75.

• From Step 2 Peak Sun Hour >> 2.2 Measured plane-of-array PSH per annum,  PSHi measured = 1666.6667h

• From Step 6 Final System Yield >> 6.3 Measured Final System Yield, Yf measured = 1333.3 kWh/kW per annum = 1333.3 h

• PR expected = 1333.3 /1666.6667 = 0.8

  • According to SEDA, PR measured is accepted if PR measured > 0.75, so PR expected = 0.8 is accepted.