| 摘要 |
PROBLEM TO BE SOLVED: To inexpensively suppress an electricity rate by improving power supply efficiency.SOLUTION: Stop of discharge is instructed, when a power conversion efficiency f(x) is compared with a ratio Rt (step S104) and it is determined that the power conversion efficiency f(x) is equal to or smaller than the ratio Rt (step S104: No). Therefore, discharge from an electric vehicle 70 is suppressed, for example, even when a power consumption Pc exceeds a generated power Pg. Therefore, discharge is avoided in a situation in which a difference between the power consumption Pc and the generated power Pg is small and the power conversion efficiency f(x) is small. Thereby, the power conversion efficiency f(x) is kept so as to be equal to or larger than a given value without being reduced, which makes it possible to surely reduce an electricity rate. |
