Solar-energized electric vehicle charging
This invention embodies a system and a method for charging electric vehicles comprising, a solar canopy over selected parking spaces, and control equipment and software to maximize the use of solar energy, minimize demand charges and allow for ancillary services to the grid. The capacity of the solar canopy is such that it is capable of providing the energy needed to operate the vehicle both for commuting and for all other uses except for trips over 2-300 miles, as provided by the control software. The system can include features for allowing access only to authorized users, for measuring the amount of energy used by each, and for monthly billing.
1 . A system comprising:
one or more solar photovoltaic canopies deployed in a parking lot to receive solar energy and provide electric energy to recharge one or more vehicles,
one or more inverters to convert DC electric energy produced by the canopies into AC energy,
one or more Electric Vehicle Service Equipments (chargers) receiving AC energy to recharge said one or more vehicles from the one or more inverters, and from an adjacent source of AC electric energy, which adjacent source of AC electric energy can accept energy from the one or more solar photovoltaic canopies,
a gross electric energy meter to measure a first total electric energy produced by the one or more solar photovoltaic canopies,
a net meter to measure energy consisting of the first total electric energy less the energy used for charging said one or more vehicles,
a meter that can measure the demand on the adjacent source of energy,
a control system with software to control the charging rate of said one or more vehicles to maximize the use of solar energy to charge the one or more vehicles and minimize the impact of charging said one or more vehicles on said demand, and
control system software that can identify authorized users of said one or more vehicles, allow them to charge said one or more vehicles and measure the energy used to charge said one or more vehicles.
2 . The system of claim 1 in which a local controller containing a microprocessor, transmission/receiver equipment and specialized control software is used to control operation of the EVSE(s).
3 . The system of claim 1 in which control functions are performed remotely in the Internet cloud.
4 . The system of claim 1 in which control functions are performed remotely based on a network provided by the EVSE manufacturer operating in the Internet cloud.
5 . The system of claim 1 in which control is provided remotely by an aggregator of several such systems.
6 . The system of claim 1 which is installed at a workplace.
7 . The system of claim 1 which is installed at a multifamily residence.
8 . A method of installing and operating the system of claim 1 in which, when said one or more vehicles are plugged into the EVSEs and charging is authorized by the control system, they receive a minimum rate of charge that will maintain the communication between the vehicle and the EVSE, which can be increased to provide additional range for the one or more vehicles to the extent that solar energy is available from the canopy.
9 . The method of installing and operating the system of claim 8 adjacent to a source of electric energy in which the electric power demand of the adjacent source of energy is continuously measured and the EVSEs are controlled to provide the maximum amount of electric power for recharging that will minimize the total demand and related demand charges.
10 . The method of installing and operating the system of claim 8 adjacent to a source of electric energy in which the EVSEs are grouped together to divide an amount of electric energy from said source of electric energy, such that said amount of electric energy will not increase the demand charges on the source of electric energy.
11 . The method of installing and operating the system of claim 8 in which individual vehicles of said one or more vehicles can be provided with extra energy to satisfy special needs.
12 . The method of installing and operating the system of claim 8 in which data from the system is periodically and automatically converted into reports and billing statements.
13 . The method of installing and operating the system of claim 8 in which the rate of charge is modulated in response to requests from the grid ISO/RTO to provide frequency regulation service and revenue.