My points are: 1. To go completely off grid, compared to 80% off, takes many more batteries, and is therefore inefficient.
2. Using those batteries a lot every night wears them out more.
3. There are many alternatives to fossil fuels at night, wind, tidal, solar salt heating, nuclear, biofuels. Whether it's better to share or store would depend on many factors.
a) What power sources are used on your grid
b) What the demand is at each point in the day
c) The transmission efficiency vs the battery conversion efficiency
d) The resource cost of the batteries
2. Using those batteries a lot every night wears them out more.
3. There are many alternatives to fossil fuels at night, wind, tidal, solar salt heating, nuclear, biofuels. Whether it's better to share or store would depend on many factors.
a) What power sources are used on your grid b) What the demand is at each point in the day c) The transmission efficiency vs the battery conversion efficiency d) The resource cost of the batteries