On average, it takes around 2,857 panels, each rated at 350 watts, to achieve one megawatt of power. However, real-world factors such as space, orientation, and local regulations can influence the final number.
Grid-connected solar systems typically need 1-3 lithium-ion batteries with 10 kWh of usable capacity or more to provide cost savings from load shifting, backup power for essential systems, or whole-home backup power.
To calculate the number of solar panels your home needs, divide your home's annual energy usage, which is measured in kilowatt-hours (kWh), by your local production ratio.
For a 350 MW system, first determine how many watts are needed in total. 350 MW converts to 350,000 kW, which roughly translates to needing approximately 1,166,667 panels at 300 watts each. However, this figure merely provides a foundation for further considerations.
In the United States, 14,626 MW of PV was installed in 2016, a 95% increase over 2015 (7,493 MW). During 2016, 22 states added at least 100 MW of capacity. Just 4,751 MW of PV installations were completed in 2013. The U.S. had approximately 440 MW of off-grid photovoltaics as of the end of 2010. Through the end of 2005, a majority of photovoltaics in the United States was off-grid.
Our 4-step guide and free solar panel calculator are all you need to estimate how many solar panels you need at your location and what type of system is best to meet your goals: grid-tied, off-grid, or hybrid.
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