Size DC and AC fuses for PV systems including string fuses, combiner fuses, and inverter input fuses.
Input Parameters
Results
--
String Fuse Size
A
--
Combiner Fuse Size
A
--
Fuse Voltage Rating
V
--
Required AIC
kA
Note: String fuses required when 3+ strings in parallel. Use DC-rated fuses only (UL 2579). Never use AC-rated fuses on DC circuits.
Reference
Min String Fuse = Isc x 1.56 (125% x 125%)
Max String Fuse = Module nameplate rating
Combiner Fuse = Isc x Strings x 1.25 x 1.25
Fuse VDC Rating >= System Voltage
AIC >= Available fault current