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Renewable energy is needed as an alternative energy source. One of the implementations of renewable energy is the Solar Power Plan. Solar Power Plan is a component that uses solar cells to convert solar energy into electrical energy. Unfortunately, the output power of this solar cell depends on the intensity of the light which causes the output power to enter the load to be unstable. Sometimes the PV power decrease because of the shading effect. From this problem a converter is needed to store energy and keep the system output voltage stable. The converter used in this paper is the zeta converter. This Zeta converter can operate like a buck boost converter. The output of the system used is not stable. So that to stabilize it requires good control. In this paper using PI controller to control this system in order to keep the output system stable. The average error after controlling the converter circuit is 0.34%. So that the efficiency of the system can achieve 99%.