What Does V2B Add to Managed Charging?

Managed charging Compare with V2B Add the vehicle-to-building schedule as a dashed line alongside managed charging.

Explore time of day in 15-minute steps Use the arrow keys for 15-minute steps. Home and End select 09:00 and 21:00. The table below shows the selected values.

Strategy at 17:30	EV activity	Grid drawGrid	Battery
Managed	Plugged in and waiting	54.0 kW	80%

The EV waits at 80% charge. The building draws 54.0 kW from the grid.

How this example works

Shared conditions.: Both schedules use the same 60 kWh battery, building demand, rooftop solar output and 7.2 kW charging limit.
What V2B adds.: Vehicle-to-building (V2B) lets the EV discharge up to 7.2 kW. The building receives all of that power during the shaded hours.
Daily peak.: Over 24 hours, the highest 15-minute average grid draw is 54.0 kW with managed charging (17:00–18:00) and 46.8 kW with V2B (17:00–20:00).
Energy losses.: Charging is 92% efficient and discharging is 92% efficient. V2B supplies 12.4 kWh to the building. Daily grid use is 2.3 kWh higher than with managed charging.
Model and source.: Both schedules minimise daily cost using the same energy and peak rates. V2B includes battery use and equipment costs. Background from the International Energy Agency.