The price of installing PV in any home depends on the power needs that are to be met. We installed a mere 9 panels because we don’t use much power. My relatives all installed 4 or more x as many panels as we did because they use more power. The panels each have a cost, as does the inverters, installation, etc.
Because our system is the fewest panels due to our low power needs, it was cheaper than our relatives. The price of solar panels is going down and warranties on panels an inverters vary. The only way to know the price for your system is to get a few quotes. Good luck. It can be a great investment.