Optional features:

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.

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.

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)

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.

Parking enforcement:
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.

WPC SIMPLE concept description

Key parts of this supplier-agnostic concept are: 

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.

Mostly Level 1

Payroll deduction

Flat monthly fee

Public stations provide flexibility

Dedicated parking

Low installation costs

No ongoing network fees

Affordable stations

WPC SImple SUrvey

WPC Power and Energy Calculator

WPC Simple concept paper

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?

  • Level 1 charging meets the needs of most drivers.
    You can use the WPC calculator to compute some individual driver examples.
  • Level 1 does not produce high load spikes.
    ​This lowers the potential demand charges and keeps utility companies happy.
  • Lower power needs
  • Less breaker space needed
  • It is easier to estimate the power consumption, which leads to easier pricing

Q: Why don’t we just install 120V outlets?

  • Employees will love you for providing easy to use EVSEs. Providing actual EVSEs with cords is much more convenient for users since they don’t have to haul their own cordset to work and go through the hassle of getting it from the trunk and putting it back every day. 
  • Hardwired units are also safer to use since the low voltage safety circuits make sure that there aren’t any connections that have power before they are securely connected.
  • Hardwired units are harder to steal. It is much harder to steal charging cord sets when they are bolted to the wall or a pedestal.
  • Installing Level 1 EVSE costs pretty much the same as installing a 120V outlet and the price difference in hardware is only about $350.

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. 


Charging station setup: 
Start by installing 10 Level 1 stations and two level 2 stations. These stations can be very simple, non-networked EVSEs.

WPC Simple

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. 

Workplace Charging Simple concept