School buses are taking kids to school in the morning and bringing them back in the afternoon, and thus are parked for a long time. If you couple that with big batteries and big chargers (right now 60 kW and very soon 120 kW), it’s a huge amount of power and energy available to utilities. It’s like the ideal poster child for V2G.
"I published a study with Honda, for example, that showed that the biggest issues causing lithium-ion battery degradation were driving, regenerative braking, fast charging, and just regular aging, in that order. We gave them all the profiles we used for V2G. They put it through their accelerated degradation protocols and automatic simulations and they came back with a degradation of 2% over the 8 years the battery is under warranty. They told us that since V2G takes only 2% on top of the 10% degradation that they expect, that they’re fine with that and will cover the battery warranty even when you use it for V2G. We did that with Nissan, with Mitsubishi, with PSA in Europe, and they’re all coming back with the same answers that they’re okay to cover the warranty."
So interesting as more information becomes available from the various tests around the world.
See On the Cutting Edge of Vehicle to Grid
Using the energy in our car batteries to power our homes during emergencies and our electrical grid during times of peak usage has felt like the holy grail where electrical vehicles, renewable energy, and efficient buildings all intersect.