When selecting a suitable 1500V PV fuse, consider the following key parameters and application scenarios to ensure system safety and efficiency:
I. Core Parameter Selection
Rated Voltage
Must be ≥1500V DC to accommodate high-voltage PV systems (such as large ground-mounted power plants and commercial and industrial rooftops). For example, the Bourns PF-PVC150R series supports 1500V DC and complies with UL 248-19, protecting against arcing and breakdown.
Rated Current
Calculation Method: Determine this value based on 1.25 times the maximum string current (Isc). For example, if a single string Isc = 8.89A, the fuse's rated current must be ≥11.11A (15A or 20A is an acceptable option).
Safety Margin: Considering factors such as ambient temperature and irradiance fluctuations, it is recommended to select a rating 1-2 levels higher than the calculated value. For example, the MC415-BMBFPNF0115A offers options ranging from 10A to 30A to accommodate systems of varying sizes.
Breaking Capacity
Must be ≥the system's maximum short-circuit current. For example, the HCPVT1500 series can safely disconnect at 50kA/1500V DC, avoiding the risk of explosion. If the system's reverse current could exceed 800A (e.g., 100 strings connected in parallel), a higher-breaking-capacity model should be selected.
Fusing Characteristics
Fast-blow (F): Suitable for inverter inputs, quickly interrupting fault currents.
Slow-blow (T): Suitable for combiner boxes, withstanding brief overloads (such as startup surges).
For example, the Bourns PF-PVC150R series offers a variety of packages, compatible with both fast-blow and slow-blow requirements.
II. Application Scenario Adaptation
Large Ground-Based Power Plants
String Arrangement: 3×11 modules per string is recommended to reduce the number of inverters and wiring, thereby lowering costs.
Fuse Selection: Choose a 250A-630A model (such as the HCPVT1500-630A) to match high-power strings. Commercial and Industrial Rooftops
Compact Design: Choose bolt-on or crimp-on end caps (such as the Bourns PF-PVC150R) to save space.
Weather Resistance: Prefer halogen-free, corrosion-resistant materials (such as PPO insulation) for humid and salt spray environments.
Offshore PV
Corrosion Resistance: Choose RoHS-compliant halogen-free fuses (such as the Bourns full range) to prevent salt spray corrosion.
High Reliability: Ensure the module's fault current withstand capability by passing a 1.35x reverse current test (as required by IEC61730-2).
