PV System Sizing
• Find out the energy usage (kWh per year).
• Find out the sun-hours per year for that location;
• https://rredc.nrel.gov/solar/old_data/nsrdb/19611990/redbook/sum2/state.html
• Apply typical efficiency factor.
• Calculate:
• Load / (sun-hours × efficiency).
• Check production with PVWATTS;
• https://pvwatts.nrel.gov/pvwatts.php
PV System Size Calculation
Load in kWh per Year
------------------------------------------------------Full Sun Hours x System Efficiency
System Size =
Buffalo, NY Example:
System Size =
5000
---------------1496 x 0.75
=
4.45 kW PV System