The WPC Simple concept is developed to give companies an affordable and easy way to provide workplace charging for their employees. This might not work for all companies as designed, but we would recommend starting with this approach and adding more complexity if required by circumstances.
Charging station setup:
Start by installing 10 Level 1 stations and two level 2 stations. These stations can be very simple, non-networked EVSEs.
Q: How does this concept work in the future?
Even though PEV battery capacity and available range will increase in the future, people will continue to commute roughly the same distance to work and the energy consumption of the vehicles is expected to stay roughly the same. This means that workplace charging needs will actually not change much in the future, assuming that the main charging is done at home.
A changing energy market (distributed generation etc.) will mean that, in the future, utility companies will provide different control programs like dynamic demand response to better manage the load in the grid. These programs are relatively easy to incorporate in this program by installing the control hardware by the central load centers.
Q: Why Level 1?
Q: Why don’t we just install 120V outlets?
Q: Why dedicated parking?
Employees time is best spent when they don’t have to think about when they will need to move their car around in the parking lot to charge it or to provide the charging spot for someone else. Saving couple of bucks by installing fewer stations costs a lot in employee productivity.
WPC Power and Energy Calculator
No ongoing network fees
Low installation costs
Public stations provide flexibility
Flat monthly fee
Mostly Level 1
If possible these stations should be installed in dedicated parking spots so employees don’t have to use valuable work time to move cars around. Install the stations as close to the electrical service as possible and preferably further away from the main entrance to reduce potential ICE:ing problems.
Key parts of this supplier-agnostic concept are:
PEV owner employees provide a vehicle registration plate number when they sign the contract so parking enforcement can use the registration plate number list. Registration plate number can also be added to the reserved parking sign in front of the parking spot.
When WPC stations are installed in dedicated parking spots, the PEV owner is paying both for dedicated parking and charging. For the sake of simplicity it is recommended to use a flat monthly billing through payroll deduction. For example, amounts could be $20/month for Level 1 charging and $30/month for Level 2 charging. Individual monthly rates can also be set by using the WPC Power and Energy Calculator tool.
You can provide flexibility in the system by installing some public Level 2 stations that would be available for both visitors and employees. These should be installed in a more central location. If public charging units are installed, they should be priced per kWh so that the electricity is a bit more expensive than what people would pay at home. The average electricity cost in the US is about 11 cents/kWh so WPC pricing could be, for example, 12 cents/kWh. If management wants to maximize the unit availability they can add a time-based component to the pricing (1-2 cents/minute)
Engage drivers and gauge interest:
You can use the WPC Simple Survey to engage with existing PEV owners and gauge interest among other employees to estimate future expansion needs.
Access control: Charging units and cords can be installed in lockable metal boxes. This also reduces the risk of vandalism and cord theft.
Metering: One cost effective way to measure energy consumption is to install a simple energy metering system next to the breaker panel that logs energy consumption. This would not require any ongoing monthly connectivity fees, but would provide information for general monitoring and data collection.
Vandalism reduction: Areas where stations are installed should be well lit. There could also be security cameras and signs alerting people about the camera surveillance.
Non-dedicated parking: If the parking capacity does not permit dedicated parking or the employees are not necessarily working in the same location every day, you should install enough charging stations so every PEV driver can always find an available charging station. This might require more active parking enforcement efforts.