The capacity of a 3x25A connection is 25 Amperes per phase, with a total capacity of 75 Amperes across all three phases. The suitability of this capacity for your solar panel system depends on the size and power of the solar panels you plan to install.

To determine if a 3x25A connection is sufficient, you should consider the following:

1. Size of the solar panel system: Calculate the total capacity or power of your solar panel system. This is usually expressed in kilowatts (kW). Ensure that the total capacity of your solar panels does not exceed the capacity of your electrical connection.
   
   

2. Energy consumption of the household: Assess your household's energy consumption to determine if the solar panel system can meet your energy needs. Consider factors such as your electricity usage patterns, peak energy demand, and any additional electrical devices in your home.
   
   

3. Rules for grid connection: Consult your local energy supplier and electrical regulations to comply with any specific requirements or limitations related to solar panel installations. They can provide guidelines on the maximum allowed capacity for your specific type of electrical connection.

It is advisable to consult a qualified solar panel installer or electrician to assess your specific situation. They can evaluate your electrical connection, energy consumption, and solar panel system requirements to determine if a 3x25A connection is sufficient, or if any upgrades or adjustments are necessary.