Skip to content

Check if the String Fuses are required and their size

*This calculator is a quick reference. Its not intended as a replacement of AS5033

Note: All terminologies mentioned below mean the same rating listed on the back of the panel or the datasheet of the panel. This is the maximum size of a string protection device in Amps. This calculator does not cover bifacial modules and assumes that the inverter back feed current (IBF STRING) is 0.

Maximum series fuse rating or Module Reverse Current ratings or Maximum Overcurrent protection rating:
IMod MAX OCPR
Required if more than one string and if :
IBF STRING + IF STRING > IMOD MAX OCPR
If Required, choose size of the string overcurrent protection:
In > 1.2 x ISTRING MAX And
In ≤ IMOD MAX OCPR

CHECK

Maximum series fuse rating of the Panel:
(IMOD MAX OCPR)
 
? The value must be greater than 0

Number of strings in Parallel(SA):
 
? The value must be greater than 0.

Panel Short circuit current(Isc):
 
? The value must be greater than 0

Result:

String fuse is:
String fuse size must be: