Photovoltaic is Boundless energy. The development of modern technology on solar cell and implementation for change solar energy are into electrical energy to serve as backup power. The installations of the solar cell was tilt angle about 10 degree,(EGCO, 2013). The researcher should be rechecked the proper tilt angle for Nakonratchasima. So, set up two test sets. Frist set can adjust the angle and the second set cannot adjust the angle. Set adjustable resistor for load 1 kΩ by adjusting resistor 10% -95% such as 10%,15%,20% etc. Measured voltage and current to be appropriate for the resistance and solar cell, which is equal to 75% or equal to 750 ohms for all tests. The energy from the solar cell be measured for a period of 12 days from 08.00 am - 16.00 pm. Record voltage and current both sets every 15 minutes from 5 degrees to 60 degree by adjust the angle 5 degrees per day. All the measured data to determine the data transfer in the horizontal plane. The research found that the proper tilt angle of the solar cell is 15 to 20 degrees for Nakonratchasima.