michael wrote:This is a bad idea. Your battery has a finite life. I wouldn't waste it relieving the power company of peak load.
Thank you for the response michael ..
Presumably you would be getting paid by your local utility company for any power your car shares with the grid.
If you have solar on your home's rooftop the 60kW storage your car provides that system would mean a profit would be realized and probably offset the cost any battery replacement.
Our cars generally sit unused most of their lives. Why not give them an active 'home power/clean grid' function when we are not using them for transportation?
Because it wears the battery out. If it were without cost to the life of your car, sure why not. But the Bolt battery, for example, carries an 80,000 mile warranty. This represents approximately 80,000/200 = 400 equivalent full charge/discharge cycles.
If one uses, for example, 1000 kWh per month in your house, this represents approximately 1000/60 = 16 full charge/discharge cycles, approximately 200 cycles per year.
So one could be using up the battery life over two years by using it for grid storage. These numbers are very rough estimates, of course, but the point is that the grid leveling usage will be wearing out the battery very possibly faster than the driving function does.
If you want battery load leveling, it will be much better to get a separate unit dedicated to the purpose and designed for that purpose.
If you want to help the utilities manage load and make a profit, simply install solar and push energy back into the grid during the peak afternoon hours. Wearing out your car battery isn't necessary.