It is necessary to measure the photocurrent of solar cellsfor determining the price and the PV system design. Althougha solar simulator with xenon and halogen lamps measuressolar cells in doors, at present, one must resolve anumber of issues, including those related to unevenness, measurementerror at manufactory and cost. A solar simulatorwith lamps is considerably accurate, however, cost and sizeproblems of the facility prevent us from using it anyplace.Since the facility is so large, the application of Reference CellMethod causes the measurement error by the several calibration.Additionally, the assessment of the established PVmodules has not been measured.