Solar power alone mainly covers the day
Without storage, a house first benefits from its production during the day. It is already profitable in many case, but a significant part of the surplus returns to the network when the household does not need it.
The battery shifts the value towards the evening
Storage makes it possible to regain part of this energy at dinner time, evening appliances or recharging the vehicle. In other words, it does not create additional kWh, but it increases local usage kWh already produced. This is what advances felt independence.
The right decision is neither “always yes” nor “never”
A battery makes sense if it meets a real profile: late consumption, desire to smooth purchases network, need for backup depending on the chosen architecture, or very low feed-in rate. Without it, better It is often worth optimizing direct self-consumption first.