To determine how many solar panels you need to generate 6,000 kWh of electricity per year, you must consider various factors, such as the efficiency of the solar panels, geographical location, the orientation and angle of the roof, and the average number of sunlight hours in your region.

On average, a standard solar panel of 1 kWp (kilowatt peak) can produce about 850-1,000 kWh of electricity per year, depending on the aforementioned factors.

If we assume an average yield of 900 kWh per 1 kWp per year, we can estimate the required capacity of solar panels:

Capacity of solar panels (in kWp) = 6,000 kWh / 900 kWh/kWp = 6.67 kWp

This means you need approximately 6.67 kWp of solar panels to generate 6,000 kWh per year. However, keep in mind that this is a rough estimate and the specific capacity of solar panels can vary depending on the mentioned factors.

It is advisable to contact a certified supplier or a professional installer of solar panels. They can help you carry out a detailed analysis of your situation, including the roof surface, orientation, and other relevant factors, to make a more accurate estimate of the required number of solar panels for your specific needs.