Aspects of the photovoltaic generation develop quickly and the photovoltaic generation already has certain application. The largest restricted factor for it is the high production cost.And the accumulator is the key factor that affects the cost especially for the stand-alone photovoltaic power system which is more popular.By establishing mathematical models of various parts of the photovoltaic system

the article establishes a dynamic operating model of the photovoltaic system based on energy storage

considering the influence of solar radiant energy and temperature on the photovoltaic system.At the same time

the article takes the total investment cost affected by panel power waste

load power loss and accumulator cost as the optimization objective

and uses energy storage capacity as a variable to establish an objective function. The genetic algorithm is used to determine the optimal solution for the accumulator capacity and the corresponding total investment cost

so that the photovoltaic system can obtain good economic benefits.This paper verifies the reliability of the model and the solution method through simulation examples

and comprehensively analyzes the economics of the system based on energy storage.