EZ Solar JB-1.XL Rooftop Solar Junction Box

The EZ Solar JB-1.XL is an oversized rooftop solar junction box designed for systems larger than 7kW. With 200 cubic inches of internal volume and a 120A maximum current rating, the XL handles more conductors and larger wire sizes than standard j-boxes - making it ideal for higher-power residential and commercial solar installations on composition shingle roofs. Patented design, UL1741 listed, and proudly made in the USA with a 25-year warranty.

Key Features

• 200 Cubic Inches - Extra-large interior provides ample room for wire connections on systems over 7kW; fewer workarounds for crowded junction boxes
• 120A Maximum Current Rating - Handles higher-current runs typical of larger residential and commercial solar systems
• 3-Sidewall Wire Entry - Conductors can enter through 3 sidewalls (vs. 1-2 on competing products), giving installers superior wire routing flexibility
• Fast Installation - Fewer components, pre-installed rail, and single-button mounting minimize time on the roof; compatible with standard composition/asphalt shingle installation methods
• Type 3R Enclosure - Weather-resistant enclosure rated for outdoor exposure; multiple patented layers of water protection
• Wide Roof Slope Compatibility - Works on roof pitches from 2.5:12 to 12:12
• UL1741 & CSA Listed - Certified to UL1741 and CSA C22.2 No. 290; Intertek listed (File #5019942)
• 25-Year Warranty - Industry-leading warranty backed by EZ Solar's advanced polymer construction
• Made in the USA - Designed and manufactured domestically

Technical Specifications

• Model: JB-1.XL
• Interior Volume: 200 cubic inches
• Maximum Voltage: 1,000V DC
• Maximum Current: 120A
• Allowable Wire Size: 14 AWG - 6 AWG
• Max Sidewall Fitting Size: 1"
• Max Floor Pass-Through Fitting Size: 1"
• Enclosure Rating: Type 3R
• Roof Slope Range: 2.5:12 - 12:12
• Operating Temperature: -35�C to +75�C (-31�F to +167�F)
• Certifications: UL1741, CSA C22.2 No. 290; Intertek File #5019942
• Roof Type: Composition / Asphalt Shingle
• Warranty: 25 Years
• Origin: Made in the USA

Approved wire connectors must conform to UL1741 and CSA C22.2 No. 290. Maintain at least �" spacing between uninsulated live parts and fittings of opposite polarity. See the JB-1.XL Spec Sheet and Installation Manual for full wiring and torque specifications.

Applications

• Residential solar systems over 7kW requiring extra wire management space
• Commercial rooftop solar on composition shingle roofs
• Any installation where multiple large-gauge conductors need to be consolidated at a single rooftop j-box
• Installers who need sidewall wire entry flexibility on tight or complex rooftops

Frequently Asked Questions

What is the difference between the JB-1.2 and JB-1.XL?
The JB-1.XL is the oversized version designed for systems larger than 7kW. It offers 200 cubic inches of interior volume and a 120A current rating, compared to the JB-1.2's 80A rating. Both share the same roof attachment design and certifications.

What roof types is this compatible with?
The JB-1.XL is designed specifically for composition/asphalt shingle roofs with a slope between 2.5:12 and 12:12.

What wire sizes are supported?
14 AWG through 6 AWG conductors are supported. See the spec sheet for a full table of approved wire connectors, torque values, and current ratings by connector type.

Is this product UL listed?
Yes - the JB-1.XL is listed to UL1741 and CSA C22.2 No. 290 through Intertek (File #5019942).