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

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

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

1. Energy Independence: With a home battery, you can become more self-sufficient since you can store a portion of the generated energy and use it later, even when the electrical grid is down. This can be especially useful if you value energy independence or if you 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 excess 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 further reduce your energy bill.

3. Tariff Structures and Incentives: In some cases, specific tariff structures and incentives may exist that promote the use of a home battery, even in combination with a net metering system. This could be the case, for example, if there are variable rates based on peak and off-peak hours, allowing you to 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 times of a home battery in your specific situation.