Outdoor 3-String Solar PV Type 3R Combiner Box

The MidNite Solar MNPV3 is a compact PV combiner designed for small residential, off-grid, and light commercial solar installations. It combines multiple PV source circuits into a single output circuit, helping simplify solar array wiring while providing a clean, serviceable location for overcurrent protection.

Built for outdoor use, the MNPV3 features a powder-coated aluminum rainproof Type 3R enclosure with stainless hardware, a lockable cover, and a custom molded plastic deadfront. It accepts 300VDC breakers or 600VDC fuses depending on system design, making it a flexible choice for smaller PV systems.

Key Features

• PV combiner for small solar power systems
• Supports three PV strings using breakers up to 300V
• Supports two PV strings using fuses up to 600V
• Outdoor rainproof Type 3R enclosure
• Powder-coated aluminum construction with stainless hardware
• Custom molded plastic deadfront
• Lockable cover
• Knockouts accept waterproof strain reliefs, conduit, or panel-mount MC type connectors
• Knockouts for lightning arrestors
• ETL listed to UL1741 for use in the U.S. and Canada
• Made in the USA

Technical Specifications

• Manufacturer: MidNite Solar
• Model: MNPV3
• Product Type: PV Combiner
• Enclosure Rating: Outdoor Rainproof Type 3R
• Enclosure Material: Powder-coated aluminum with stainless hardware
• Number of PV Strings: 3 strings using breakers up to 300V, or 2 strings using fuses up to 600V
• Maximum Number of Output Circuits: 1
• String Input Wire Range: 14 to 6 AWG
• Maximum OCPD Rating: 30A with fuses, 63A with 300V breakers
• Maximum Output Amps: 60A
• Output Wire Range: 14 to 1/0 AWG
• Lug Temperature Rating: 90°C
• Deadfront: Custom molded plastic deadfront
• Lockable: Yes
• Rating: UL1741
• OCPD Included: No

What’s Included

• MNPV3 PV combiner enclosure
• Custom molded plastic deadfront
• Lockable rainproof Type 3R aluminum enclosure

Applications

• Small solar PV arrays
• Off-grid cabin systems
• Residential PV systems
• PV source circuit combining
• Solar charge controller input wiring
• Grid-tie or off-grid systems within the product’s voltage and current ratings

Ideal For

• Installers needing a compact PV combiner for up to three strings
• Small off-grid solar systems
• Residential solar projects
• Systems using MidNite Solar MNEPV-style breakers or compatible fuse configurations
• Outdoor PV installations requiring a lockable rainproof enclosure

System Compatibility

• Compatible with up to three PV strings using breakers up to 300V
• Compatible with up to two PV strings using fuses up to 600V
• Accepts 14 to 6 AWG PV string input wiring
• Supports one output circuit up to 60A
• Can be wall mounted, pole mounted, or mounted on a sloped roof up to 14 degrees incline

Check Before Ordering

• Overcurrent protection devices are not included with the MNPV3.
• Confirm whether your system requires breakers or fuses before ordering OCPDs.
• Confirm your PV system voltage does not exceed the breaker or fuse rating being used.
• Confirm the number of PV strings required; this model supports three strings with breakers or two strings with fuses.
• Verify output current, wire size, and conductor ratings are compatible with your system design.
• Installation should follow applicable electrical codes and be completed by a qualified installer.