neroden
Model S Owner and Frustrated Tesla Fan
That's totally reasonable. My argument is dependent on some weird assumptions which I spent some years developing.Sorry, I'm not following your argument here.
Basically I believe that many many people will habitually overbuild their solar panels out of a form of conservatism. As a result, I think people will have "free" wasted electricity at midday. I am calculating the value of the battery for people who did that. I also expect that current-style net metering will slowly be eliminated... utilities will eventually refuse to credit noontime electricity generation towards nighttime usage (which is a reasonable thing to refuse to do). This is already the proposal in Maine, supported by the solar panel companies.
For people who underbuild their solar panels, yes, you have to add the electricity generation cost to the electricity storage cost.
Seems like you are saying, it will cost 8c to store each kwh into the battery, and then retrieve 90% of that later. Then, you compare that to cost of electricity from grid, which includes generation+distribution costs. The battery doesn't generate anything. You have to first produce (or purchase) electricity, then store that into the battery at 8c/kwh.