To determine how many solar panels you need to generate 6,000 kWh of electricity per year, you need to consider various factors, such as the efficiency of the solar panels, the geographical location, the orientation and slope 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 approximately 850-1,000 kWh of electricity per year, depending on these factors.

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

Solar panel capacity (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 solar panel installer. They can help you conduct a detailed analysis of your situation, including the roof area, orientation, and other relevant factors, to make a more accurate estimate of the required number of solar panels for your specific needs.