Enter the maximum power from the solar sell (W), the open circuit voltage (volts), and the short-circuit current (amps) into the Fill Factor Calculator. The calculator will evaluate the Fill Factor. 

Fill Factor Formula

The following formula is used to calculate the Fill Factor. 

FF = P / (V*I)

Variables:

  • FF is the Fill Factor ( )
  • P is the maximum power from the solar sell (W) 
  • V is the open circuit voltage (volts) 
  • I is the short-circuit current (amps) 

How to Calculate Fill Factor?

The following steps outline how to calculate the Fill Factor.


  1. First, determine the maximum power from the solar sell (W).
  2. Next, determine the open circuit voltage (volts). 
  3. Next, determine the short-circuit current (amps). 
  4. Next, gather the formula from above = FF = P / (V*I).
  5. Finally, calculate the Fill Factor.
  6. After inserting the variables and calculating the result, check your answer with the calculator above. 

Example Problem:

Use the following variables as an example problem to test your knowledge.

maximum power from the solar sell (W) = 30

open circuit voltage (volts) = 3

short-circuit current (amps) = 12FF = P / (V*I) =  ?