**5. Conclusions**

An EV can be charged from an EVSE only if communication between these is established and both send a confirmation that they are ready for the charging process. Periodically all charging stations must verify the good functioning by the maintenance persons. In this paper, an EV simulator has been developed that is a useful tool for those who do maintenance at the charging stations. This equipment is capable as follows:


The authors also propose a solution that can be implemented in the office or mall parking area, where the customers have the benefit of being able to charge their EVs for free. The charging stations are controlled by a PLC-HMI system and the customers are offered the certainty that their EV will not be disconnected from the charging station by an unauthorized person. When a customer plugged his EV to the charging station before START charging, it is necessary to introduce an identification code in HMI. For STOP charging, unlock the cable connector and disconnect the EV from the charging station; the PLC checks whether it introduced the same unique identification code in order to validate these actions.

**Author Contributions:** Conceptualization, M.R.; methodology, M.R. and G.R.; validation, C.F., M.S.R. and C.A.; formal analysis, M.R.; investigation, M.S.R. and G.R.; data curation, G.R.; writing—original draft preparation, A.-R.F., M.S.R. and M.R.; writing—review and editing, M.R. and C.F.; visualization, A.-R.F.; supervision, C.A.; project administration, A.-R.F. and C.F. All authors have read and agreed to the published version of the manuscript.

**Acknowledgments:** This work was supported by a grant from the Romanian Ministry of Research and Innovation, CCCDI-UEFISCDI, project number PN-III-P1-1.2-PCCDI-2017-0776/No. 36 PCCDI/15.03.2018, within PNCDI III.

**Conflicts of Interest:** The authors declare no conflict of interest.
