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Solar Combiner & Junction Boxes

Combiner and junction boxes bring multiple PV strings together into a single protected conductor pair, and give you a code-compliant place to land fuses, disconnects and surge protection.

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EG4 Mini Split - Wall Bracket Kit - Green Vista Living
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

EG4 Mini Split - Wall Bracket Kit

EG4 Electronics

EG4 Mini Split - Wall Bracket Kit The EG4 Mini-Split Outdoor Wall Mount Bracket securely supports all EG4 outdoor units with a 352 lb capacity, kee...

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$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
Green Vista Living EG4 Enclosed Battery Rack [Pre-Assembled] | 3 Slot | Wheels Included Power Accessories - Side View
Green Vista Living EG4 Enclosed Battery Rack [Pre-Assembled] | 3 Slot | Wheels Included Power Accessories
$799.95
$799.95 - $799.95
$799.95
$439.99
$439.99 - $439.99
$439.99

EG4 Enclosed Battery Rack [Pre-Assembled] | 3 Slot | Wheels Included

EG4 Electronics

EG4 Enclosed Battery Rack [Pre-Assembled] | 3 Slot | Wheels Included EG4 Enclosed Battery Rack, featuring an enclosed cabinet design. The cabinet d...

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$799.95
$799.95 - $799.95
$799.95
$439.99
$439.99 - $439.99
$439.99
Discover AES RACKMOUNT Quick Stack Rack 950-0050
$79.10 - $79.10
$79.10
$79.10 - $79.10
$79.10

Discover AES RACKMOUNT Quick Stack Rack 950-0050

Discover

The Discover AES RACKMOUNT Quick Stack Rack 950-0050 is a enclosure from Discover, supplied new and sold by Urban Supply Inc as an authorized deale...

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$79.10 - $79.10
$79.10
$79.10 - $79.10
$79.10
Discover AES 950-0053 Rackmount ESS 30kWh Slimline Enclosure
$2,100.00 - $2,100.00
$2,100.00
$2,100.00 - $2,100.00
$2,100.00

Discover AES 950-0053 Rackmount ESS 30kWh Slimline Enclosure

Discover

The Discover AES 950-0053 Rackmount ESS 30kWh Slimline Enclosure is a enclosure from Discover, supplied new and sold by Urban Supply Inc as an auth...

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$2,100.00 - $2,100.00
$2,100.00
$2,100.00 - $2,100.00
$2,100.00
Tigo Single Core, Pure Signal RSS Transmitter, Din Rail
$168.39 - $168.39
$168.39
$168.39 - $168.39
$168.39

Tigo Single Core, Pure Signal RSS Transmitter, Din Rail, 120/240VAC PS, Outdoor Enclosure Kit

Tigo Energy

The Tigo Single Core, Pure Signal RSS Transmitter, Din Rail, 120/240VAC PS, Outdoor Enclosure Kit is a enclosure from Tigo Energy, supplied new and...

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$168.39 - $168.39
$168.39
$168.39 - $168.39
$168.39
Tigo Dual Core Pure Signal RSS Transmitter, Din Rail
$173.73 - $173.73
$173.73
$173.73 - $173.73
$173.73

Tigo Dual Core Pure Signal RSS Transmitter, Din Rail, 120/240VAC PS, Outdoor Enclosure Kit

Tigo Energy

The Tigo Dual Core Pure Signal RSS Transmitter, Din Rail, 120/240VAC PS, Outdoor Enclosure Kit is a enclosure from Tigo Energy, supplied new and so...

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$173.73 - $173.73
$173.73
$173.73 - $173.73
$173.73
REDARC Tow-Pro Universal Mount
$13.00 - $13.00
$13.00
$13.00 - $13.00
$13.00

REDARC Tow-Pro Universal Mount

REDARC

The REDARC Tow-Pro Universal Mount is a enclosure from REDARC, supplied new and sold by Urban Supply Inc as an authorized dealer with US-based stoc...

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$13.00 - $13.00
$13.00
$13.00 - $13.00
$13.00
Ruuvi Silicone Case for RuuviTag Bluetooth Sensor
$4.99 - $4.99
$4.99
$4.99 - $4.99
$4.99

Ruuvi Silicone Case for RuuviTag Bluetooth Sensor

Ruuvi

The Ruuvi Silicone Case for RuuviTag Bluetooth Sensor is a enclosure from Ruuvi, supplied new and sold by Urban Supply Inc as an authorized dealer ...

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$4.99 - $4.99
$4.99
$4.99 - $4.99
$4.99
Green Vista Living EG4 Enclosed 6 Slot Battery Rack [Pre-Assembled] | Wheels Included | Bus... Power Accessories - Side View
Green Vista Living EG4 Enclosed 6 Slot Battery Rack [Pre-Assembled] | Wheels Included | Bus Bar Covers... Power Accessories
$789.00
$789.00 - $789.00
$789.00
$729.99
$729.99 - $729.99
$729.99

EG4 Enclosed 6 Slot Battery Rack [Pre-Assembled] | Wheels Included | Bus Bar Covers | Welded (Grey)

EG4 Electronics

EG4 Enclosed 6 Slot Battery Rack [Pre-Assembled] | Wheels Included | Bus Bar Covers | Welded (Grey) EG4 Enclosed Battery Rack, featuring an enclose...

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$789.00
$789.00 - $789.00
$789.00
$729.99
$729.99 - $729.99
$729.99
EG4 Indoor Buildable Conduit Box - For EG4 100Ah Wallmount and EG4 6000XP - EG4 Indoor Buildable Conduit Box top view
EG4 Indoor Buildable Conduit Box - For EG4 100Ah Wallmount and EG4 6000XP - EG4 Indoor Buildable Conduit Box - front view
$161.00
$161.00 - $161.00
$161.00
$54.99
$54.99 - $54.99
$54.99

EG4 Indoor Buildable Conduit Box - For EG4 100Ah Wallmount and EG4 6000XP

EG4 Electronics

The EG4 Indoor Buildable Conduit Box - For EG4 100Ah Wallmount and EG4 6000XP is an enclosure from EG4 Electronics — 100Ah.Why It MattersOff-grid m...

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$161.00
$161.00 - $161.00
$161.00
$54.99
$54.99 - $54.99
$54.99
EG4 280Ah and 314Ah All Weather WallMount Conduit Box
$187.99 - $187.99
$187.99
$187.99 - $187.99
$187.99

EG4 280Ah and 314Ah All Weather WallMount Conduit Box

EG4 Electronics

The EG4 280Ah and 314Ah All Weather WallMount Conduit Box is an enclosure from EG4 Electronics, stocked by Urban Supply for solar and storage build...

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$187.99 - $187.99
$187.99
$187.99 - $187.99
$187.99
Pegasus Solar - BondBox - Pegasus BondBox installed on a solar rail system over asphalt shingles, showing its durable black metal enclosure securely mounted for system grounding.
Pegasus Solar - BondBox - Pegasus Junction Box with locking lid and conduit ports for clean, weather-resistant solar wiring management.
$60.99 - $60.99
$60.99
$60.99 - $60.99
$60.99

Pegasus Solar - BondBox

Pegasus Solar

The Pegasus Solar - BondBox is an equipment enclosure from Pegasus Solar — Grounding Integrated ground lug for up to 3 wires; Ground Wire Size 6.Wh...

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$60.99 - $60.99
$60.99
$60.99 - $60.99
$60.99
Peco 2in PVC Type LL Conduit Body - Peco 2in PVC Type LL Conduit Body
$13.75 - $13.75
$13.75
$13.75 - $13.75
$13.75

Peco 2in PVC Type LL Conduit Body

Peco

The Peco 2in PVC Type LL Conduit Body is an equipment enclosure from Peco — 2in.Why It MattersAn enclosure's rating decides where the equipment can...

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$13.75 - $13.75
$13.75
$13.75 - $13.75
$13.75
OutBack Power - BMS & Junction Box - OutBack Power | BMS & Junction Box
OutBack Power - BMS & Junction Box - Outback Power EnergyCell 5 stack in a gray enclosure with side-mounted breaker
$1,292.73 - $1,292.73
$1,292.73
$1,292.73 - $1,292.73
$1,292.73

OutBack Power - BMS & Junction Box

OutBack

The OutBack Power - BMS & Junction Box is an equipment enclosure from OutBack — Reliable Inverter Communication Uses CAN or RS485 communication...

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$1,292.73 - $1,292.73
$1,292.73
$1,292.73 - $1,292.73
$1,292.73

How to Choose

Count your strings first, then add headroom — a four-string box on a three-string array leaves room to grow. Confirm the enclosure's NEMA or IP rating matches the environment; rooftop boxes need UV-stable, water-tight housings. Check the busbar current rating against the sum of your string currents with the NEC safety factor applied.

Key Specifications Explained

  • String capacity: 2 to 6 strings typical for residential
  • Enclosure rating: NEMA 3R/4X or IP65+ for outdoor
  • Fusing: Inline string fuses, commonly 15A to 30A at 1500V
  • Busbar rating: Must exceed total string current with NEC derating
  • Entry: Weather-sealed cord grips and conduit bodies

Brands We Carry

SolaDeck, Pytes, Peco, MidNite Solar and IMO Solar.

Frequently Asked Questions

Do I always need a combiner box?

Only with multiple strings. A single string can often land directly at the inverter.

Fuses or breakers?

Fuses are standard in DC combiners for their interrupt rating. Breakers appear on the AC side and in some integrated designs.

Can a combiner box go on the roof?

Yes with a rooftop-rated enclosure such as a SolaDeck. Confirm the UV and water rating.

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