Planning and Cost Consideration

This section will look at the planning and cost to implement a residential or commercial EVSE, and the combination of Level II EVSE and DC fast chargers for the hub locations. The costs are estimates consideration, to provide bases that could help inform the reader of cost and possible implementation of EVSE. The cost does not show the construction of facilities to house the EVSE.

Risk Matrix

A new owner, wanting to implement a new EVSE to their location needs to take in the consideration and risk of operating one.  Below is a risk matrix highlighting the probability and foreseeable consequence of a public EVSE.   Most likely EV owners will properly use the equipment with little issue.  Medium risk would be vandalism creating a significant damage to the equipment and facilities. Serious consequence but very unlikely to happen would be personal injury, like tripping over the connection cord. Most catastrophic but extremely unlikely would be death.  There are multiple ways to reduce the risk by implementing a monitoring system or attendant to be available at the location.  A visual risk matrix can be viewed below.

Figure 41: Risk Matrix for Public EVSE

 Residential, Fleet and Commercial

Local home owners and business that want to show support for the addition of electric vehicles in the Chattanooga area can install EVSE. The use of Level II EVSE will be the preferred method to provide reasonable charge time and to allow utility company to shift the load as necessary to provide constant power. The residential and fleet time charges will mainly be over night, while the commercial will require power during business hours. The Level II EVSE will required a dedicated branch circuit hardwired to a permanently mounted to a secure wall or on a pedestal. Most installation of the Level II EVSE will be considered new construction; installation must meet codes and inspection set by City of Chattanooga. First table will show the estimated cost for residential home. The cost will be considerable lower if the home owner has an updated breaker box that can be easily adapted. The home owner will have about $1000 in cost of pre-installation, and about $1077 in actual equipment to place the EVSE.  

Table 8: Residential Cost to implement an EVSE

A fleet or commercial location would use more than two EVSE to supply power to multiple EVs. The second table takes into consideration that five Level II EVSE will be implemented. There could be additional cost and materials required depending on if there is any upgrades required to implement the EVSE. 

Table 9: Residential Cost to implement an EVSE          

The charging hub location will have a mixture of two Level II EVSE and three DC fast chargers. The table below does not include the construction cost of new facilities to place the EVSE. The new construction must meet codes and inspection set forth by the City of Chattanooga. See Appendix B for City of Chattanooga Codes. The estimated cost for implementation of a hub location for EV drivers would be about $ 86,950. 

Table 10: EVSE Hub Cost to implement an EVSE

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