East–west solar

A day in our solar house, hour by hour: with and without the EV

Two sunny October days at our house, replayed from our own data. On one, 22 kWh of sunshine went into the car; on the other, 23 kWh went to the grid for NZ$3.64. What each was worth, why the home battery doesn't fill on car days, and how to work out which wins on your tariff.