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GPI to pair grid solar with EV charging

Solar PV panels on carports,

Great Plains Institute launches “solar+EV” initiative to pair PV generation with EV technologies

The US Department of Energy’s National Renewable Energy Laboratory (NREL) selected The Great Plains Institute to conduct research on new ways that solar energy can improve the affordability, reliability, and resiliency of the nation’s electric grid.

The Great Plains Institute (GPI) is one of nine teams selected to join the the Solar Energy Innovation Network. GPI will team up with a wide-variety of agencies, organisations, and companies to launch a “market transformation” effort for renewable-energy-controlled EV charging technologies.

The work will assess the potential value of treating renewable energy generation and controlled EV charging as a single linked technology that benefits utilities and consumers. The solutions developed and demonstrated by the GPI team will create implementable pilot projects in Minnesota and serve as a blueprint for other states.

“We selected teams that are experimenting with promising ideas to use solar power to improve the future of grid security and reliability in their communities,” said Kristen Ardani, who leads the Innovation Network at NREL.

With the continuing surge in EV adoption, numerous studies show that the nation’s electric grid be challenged to keep up with demand. While much of the attention is given to fast chargers that can completely charge an EV battery in 20-40 minutes, most charging is likely to happen at home, work, or during errands using slower Level 2 chargers. Multiple EVs charging simultaneously can create significant local grid problems, increasing demand on the transformers or grid circuits, or exacerbating peak demand.

At the same time, solar energy generation is easily added to the grid at low levels of penetration, as currently seen in Minnesota. The low cost of noon-time solar production creates significant amounts of inexpensive electricity, but it tails off in the evening when many EV owners plug in. Looking at these dilemmas together, rather than separately, creates opportunity.

Directly controlling the level of charging to match the real-time production of inexpensive renewable energy better uses renewable energy, reduces use of the grid at peak demand, and potentially avoids expensive grid upgrades.

“The value of solar+EV technology differs depending on whether it’s residential use, workplace charging, or fleet charging,” said Brian Ross, the GPI project manager. “Solar+EV opportunities also change for different types of utilities in terms of meeting electric load, improving grid utilization, and avoiding costly upgrades. To capture these benefits, we need to see if we can create market-driven development opportunities for solar developers, utilities, and property owners, and the Solar Energy Innovation Network project gives us that opportunity.”

GPI is currently evaluating a solar+EV pilot project at its headquarters in Minneapolis, MN. A 30-KW solar array is paired with three EV chargers in the parking lot. Charging is kept to a minimal rate until the solar array is producing power when charging goes up to a full Level 2 rate.

The GPI team is working with project partners to develop additional pilot projects that test larger scale deployment, and different types of charging patterns such as at a residential setting, park and ride lots, or fleet charging. The project will also consider the same controlled charging technology for using excess wind energy.

Source: Great Plains Institute


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