I read somewhere about people charging their EV at night with cheap power and then not driving, so they could then use the energy in the EV in their house
Ah yes - Vehicle to House (V2H) and then also Vehicle to Grid (V2G)
Most cars are currently not capable of it, but it will be coming. There has been a trial involving Nissan Leafs and a very specialised bidirectional charger, in which people got paid 30-35p/kWh when the grid asked for energy from their cars. That may not sound great, but it is phenomenal compared to what you could get for exporting from solar panels. They found that it did not degrade the batteries (one of the fears around using an EV this way), it was neutral or actually improved them.
If you have a house battery then you do the same - charge at a cheap overnight rate and use it during the day. In fact my house is currently running from electricity which I imported for 5p/kWh in the early hours, mixed with a bit of solar.
Batteries are expensive, however. Mine is 5.2kWh, and on a miserable rainy day like today when I get very little solar generation, it will run out at some point and then I’ll be paying the day rate. My car has a 64kWh battery and would run the house for days. The car can also charge at 7kW and could presumably discharge at that or higher - it has to when I’m driving it. The house battery can only charge and discharge at 2.6kW. So when I put the oven, hob and kettle on at the same time, we draw from the grid.
I think V2H and V2G are a big component of how we will balance the grid in the future. One of the downsides of wind and solar is that they produce electricity dependent on conditions, not when you need it. Storage is the answer to that and EV’s on people’s drives could be a significant part of the solution.
There will be safeguards, e.g. you specify a minimum charge level so you know you will always be able to get somewhere in an emergency or have enough to last a 2-day blackout.