Here are some steps you can follow to estimate the number of solar panels you need:

1. Determine your energy consumption: Analyze your energy bills to get an idea of your average daily energy consumption in kilowatt-hours (kWh). This provides you with a basis for determining how much energy you want to generate with solar panels.

2. Calculate the required energy generation: Establish how much energy you want to generate using solar panels. This could be based on your total energy consumption or a portion of it that you wish to cover with solar energy. Keep in mind that solar panels do not always work at full capacity and there are seasonal variations, so you may want to add a safety margin to your calculations.

3. Check the yield of solar panels: Consult the specifications of the solar panels you want to install to find out the yield per panel. This is usually expressed in Watt-peak (Wp). The yield can vary depending on the brand, type, and efficiency of the panels.

4. Calculate the required power: To determine the required power of the solar panels, divide the desired energy generation by the yield per panel. For example, if you want your solar panels to generate 5000 kWh annually and your panels have a yield of 300 Wp per panel, then you would need approximately 17 solar panels (5000 kWh / 0.3 kW = 16.67 panels).

Keep in mind that this calculation is a rough estimate and there may be other factors at play, such as the orientation and tilt angle of your roof, any shading issues, and the available space for the installation of the solar panels. It is recommended to contact a professional solar panel installer for a detailed analysis and advice tailored to your specific situation.