PV Combiner Box HiSmart NV822300 DC 3in-3out IP66 junction box for solar arrays

HiSmart NV822300 is a PV combiner box with three DC inputs and three DC outputs designed for solar arrays. The IP66-rated polycarbonate enclosure provides dust-tight and strong water ingress protection for outdoor rooftop or ground-mounted installations. The unit integrates a lockable DC switch with a patented arc extinguishing chamber and three DC surge protection devices to protect and isolate the solar DC side while simplifying string consolidation and cable management.

Advantages

The combiner box supports up to 1000 V DC and includes a lockable 1000 V, 25 A DC switch with a patented arc extinguishing chamber. Three built-in DC surge protection devices provide fast response protection (response time <25 ns) and a maximum discharge current of 40 kA. The polycarbonate enclosure meets V0 UL94 flame-retardant rating, UV resistance and IEC60529 IP66 protection, and the box is supplied with MC4-compatible connectors for straightforward connection.

Suitable for

• Combining multiple PV strings on residential and commercial rooftop installations
• Ground-mounted solar arrays requiring organized DC string consolidation
• Outdoor installations needing IP66 dust and water protection

Key specifications

• Inputs: 3 strings
• Outputs: 3 strings
• Maximum system voltage: 1000 V DC
• DC switch: 1000 V, 25 A (1 pc), lockable, patented arc extinguishing chamber
• DC surge protection: 1000 V, Imax 40 kA (3 pcs), In 20 kA, Up 3.6 kV, response <25 ns
• Short circuit current per input (Isc): adjustable 15 A–30 A
• Maximum output current: 25 A
• Box material: polycarbonate, UL94 V0
• Ingress protection: IP66 (IEC60529)
• Dimensions: 312 × 262 × 162 mm
• Input cable glands: PG09, 2.5–16 mm
• Output cable glands: PG21, 2.5–16 mm
• Operating temperature: -25 °C to +60 °C
• Standards: IEC60529, UL508i, IEC60947-3 Pv2, IEC 61643-31, EN 50539-11 + A1
• Warranty: 24 months

How to use

Mount the combiner box on a suitable flat surface following local electrical codes. Connect up to three PV strings to the input terminals and route the combined outputs to the inverter using the output terminals; MC4-compatible connectors simplify string connections. Use the lockable DC switch to isolate the DC side during installation and maintenance. Ensure cable diameters match the specified gland ranges (2.5–16 mm) and tighten all connections to manufacturer torque recommendations.

Recommendations

Install the HiSmart NV822300 in a location with adequate ventilation and away from direct accumulation of debris. Verify system polarity and insure overcurrent protection is provided according to inverter and local regulations. Periodically inspect the enclosure seals, surge protection modules and connections, and replace SPDs after significant surge events or according to maintenance intervals.