The relevance of a home battery in combination with a net metering system can depend on various factors, such as the specific regulations and tariff structures applicable in your region, as well as your energy consumption pattern and objectives.

With net metering, the surplus energy generated by your solar panels and fed back into the electricity grid is offset against your energy consumption at a later time. In this case, the electricity grid acts as a kind of 'virtual battery' where you can store excess energy and use it later when you need it, without the need for physical battery storage.

Adding a home battery to a system with net metering can still offer benefits in some cases, such as:

1. Energy independence: With a home battery, you can become more self-sufficient, as you can store and use part of the generated energy later, even when the power grid goes down. This can be particularly useful if you value energy independence or live in an area with unreliable electricity supply.

2. Optimization of self-consumption: A home battery allows you to maximize the self-consumption of your generated energy. Instead of feeding the surplus energy back into the grid, you can store it in the battery and use it later when your energy consumption is higher. This can help to further reduce your energy bill.

3. Tariff structures and incentives: In some cases, there may be specific tariff structures and incentives that encourage the use of a home battery, even in combination with net metering. This might be the case, for example, if there are variable rates based on peak and off-peak hours, where you can use the stored energy during peak hours to save costs.

It is important to consult the specific regulations and tariff structures in your region, as well as a professional installer or energy advisor, to get a detailed analysis of the potential benefits and payback periods of a home battery in your specific situation.