Total Cost Breakdown of our Solar Power System & How Many Years to Pay for Itself. This year we installed our own solar power system. We installed 28 solar panels for a total of 11,140 watts. We also installed a hybrid inverter with 20 Kilowatt Hours of batteries to store power and give us the ability to run off grid during power outages. This system will make an average of 15,050 Kilowatt hours a year. EP Cube all in one Solar Energy solution: https://bit.ly/47dLudA Low Price Per Watt - Solar P