The number of solar panels you may have depends on various factors, including the grid operator's policy, the capacity of your electrical connection, and the available space on your roof.

In the Netherlands, there is generally no specific limit on the number of solar panels you can install. You can install as many solar panels as you want, as long as your electrical connection and the power grid can handle it.

However, it is important to consider the capacity of your electrical connection. The capacity is expressed in amperes (A) and determines the maximum amount of electricity you can simultaneously draw or inject into the grid. Having too many solar panels can lead to exceeding the capacity of your connection, which can cause issues.

Therefore, it is wise to contact your grid operator or a professional solar panel installer to check the capacity of your electrical connection and discuss how many solar panels you can safely install. They can advise you on the optimal configuration and any adjustments to your electrical connection that may be needed.

It is also important to consult local regulations and building codes, as there may be restrictions on the number of solar panels or specific requirements regarding their placement and aesthetics.