Without netting, a solution like SolarWatt becomes interesting. More is generated than we can use and if there is no sun, we still need energy. No matter how much or how little is needed. Batteries at home are not useful for electric driving: you need a lot of them and the car itself is a battery (there are also experiments with the car as energy storage). You can better charge it at a charging station, because you need a lot of storage capacity to achieve this. Direct charging based on extra energy is possible, but this comes directly from the panels instead of a battery.
Off the grid
There are only a very limited number of people who are completely off the grid and therefore completely self-sufficient in terms of electricity. Technically it is possible, but not yet necessary. Netting is still possible. In addition, there is no problem at all to simply continue to purchase energy from the energy companies. They are really not going to stop doing so in the short term. With the expected transition to electric driving, it will still be necessary to purchase at least that part of the electricity from an electricity company. Moreover, we do want to be sustainable, but also have living pleasure and comfort for the lowest possible investment.
How does energy storage in batteries work?
The sun does not always shine. By this I do not high school senior mailing list mean that it is sometimes cloudy, but especially also the time when the sun has set. In addition, solar panels are often placed on a sloping roof on one side (where most of the sun can be caught). But we do need energy continuously. Think of a refrigerator, for example. Through netting, we supply the grid with excess capacity (what you generate, but do not need) and retrieve it when we need it. The energy generated in the solar panels is of course direct current, while many household appliances work on alternating current: this is what comes out of the socket. So whatever you want to do, you need an inverter to use the energy for, for example, a TV or a washing machine. For a car, which is increasingly becoming an application, this is of course not necessary either.
The photo below shows a whole series of batteries (the grey elements) with the control elements (black) below. This arrangement is sufficient to provide a medium-sized organisation with energy storage capacity. In total x kWh is hanging here. For a normal household with two parents and two children, two to three batteries are sufficient.
A series of batteries (grey) with control elements (black)
Recently, Nieuwsuur paid attention to the storage of energy in the batteries of an electric car. That is of course also a possibility. To create such storage in the home, you need a very large number of batteries (such as those from SolarWatt). A car can therefore be a temporary storage, or one that in many cases is of course not in front of the house 24 hours a day. The triptych at Nieuwsuur does indicate that this is a subject that is of interest.