When most people think about solar power, they imagine panels converting sunlight into electricity. But for installers, EPC teams, and project managers, a solar project goes far beyond panels. At the core of every high-performing solar plant is an accurately structured Bill of Materials (BOM) document that defines every part required to design, procure, and build the system.

At One Place Solar, we help EPC teams across the United States build engineering-grade BOMs using our professional solar proposal design services and permitting workflows. When a BOM is created with real engineering data, projects move faster, approvals become easier, and on-site delays are eliminated.

This guide explains the BOM structure for a 246.4 kW commercial solar project and shows why precision at this stage determines long-term project success.

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What Is a Bill of Materials (BOM) in a Solar Project?

A BOM is a complete inventory of everything required to complete a solar installation from the largest components like modules to the smallest connectors.

A professional solar BOM includes:

• Component specifications
• Quantities
• Electrical and mechanical requirements
• Brand/model selections
• Compliance documentation

For a project as large as 246.4 kW, missing even one small item can stop installation. A well-structured BOM prevents procurement issues and keeps project timelines on track.

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Key Components in a 246.4 kW Solar Project BOM

1. Solar PV Modules

The panel count depends on wattage. For example, using 600W panels requires about 411 modules.

The BOM specifies:

• Brand (LONGi, Trina, JA Solar)
• Watt rating and efficiency
• Dimensions and weight
• Certifications (UL, IEC)

Final selection is based on residential solar system design and performance modeling.

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2. Inverters

System size determines whether string or central inverters are used.

Common setups:

• Multiple 80–100 kW string inverters
• Central inverter (less common)

BOM details include:

• Model numbers
• MPPT capacity
• Communication methods
• Protection class

Electrical planning is completed using solar electrical design standards.

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3. Mounting Structure

Mounting depends on site conditions:

• RCC rooftops
• Metal roofs
• Ground mounts

Included hardware:

• Rails
• Clamps
• Base plates
• Tilt specifications

Engineering is handled via solar plan set design.

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4. DC Combiner Boxes

Combiner boxes group strings safely.

BOM covers:

• Input strings
• Isolators
• Fuses
• IP-rated enclosures

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5. AC Distribution Panel (ACDB)

Includes:

• MCCBs
• MCBs
• Energy meters
• Surge protection (SPD)
• Earthing links

Designed through commercial solar engineering.

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6. DC & AC Cabling

DC Cables

• UV-resistant, certified
• 4–6 sqmm typically

AC Cables

• Copper or aluminum
• Sizing based on load and distance

Exact cable runs are documented.

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7. Earthing System

Includes:

• Earth pits
• Copper/GI rods
• Strips and clamps

Most commercial plants require three independent earth pits.

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8. Lightning Protection System

Includes:

• Arresters
• Down conductors
• Dedicated earthing

Protects the site from surge damage.

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9. Connectors & Accessories

Essential items:

• MC4 connectors
• Junction boxes
• Cable trays
• Lugs and ferrules

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10. Monitoring System

Includes:

• Data loggers
• Smart monitoring software
• Real-time dashboards

Improves system visibility.

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Why a Detailed BOM Matters for a 246.4 kW Solar Project

A precision BOM ensures:

Zero missing parts
Faster procurement
Accurate budgeting
Fewer site disruptions
Higher lifetime energy generation

Every strong solar project begins with a reliable BOM.

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Case Study: 246.4 kW Commercial Rooftop Project Texas, USA

A Texas manufacturing facility planned a 246.4 kW rooftop solar plant. The EPC faced earlier delays on other projects due to inaccurate BOMs.

Challenges

• Material shortages
• Incorrect inverter sizing
• Delayed permits
• Cable mismatches
• Budget overruns

Our Solution

One Place Solar delivered:

• Permit-ready BOM
• Electrical design layouts
• Structural validation
• Procurement-aligned documentation

Results

No missing components
First-round permit approval
On-time commissioning
Reduced installation errors
Accurate costing

This project moved from procurement to commissioning without BOM-related issues.

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Why One Place Solar Gets BOMs Right

We deliver:

• AHJ-ready documentation
• NEC-aligned layouts
• Utility-specific designs
• Site-based modeling
• Procurement-ready BOMs

We support teams across Texas, California, Florida, and Arizona.

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FAQs

How long does BOM preparation take?
Typically 2–3 business days.

Are BOMs permit-ready?
Yes fully compliant.

Do you serve all U.S. states?
Yes.

Are BOMs usable for bidding?
Yes, accurate cost modeling.

Can you customize by utility?
Yes.

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Final Summary

A 246.4 kW solar plant is only as strong as the Bill of Materials behind it. When your BOM is accurate, engineering-driven, and ready for procurement, the entire project moves more smoothly from early planning all the way to commissioning. That means fewer approval hurdles, fewer on-site surprises, and far less risk of costly rework.

At One Place Solar, we go beyond listing parts. Every BOM we create is engineered to reflect real-world performance, regulatory requirements, local climate factors, and long-term system reliability. This helps EPC teams and installers avoid missing components, fine-tune system design, and deliver every project with confidence.

Want to build your BOM the right way from day one?

Reach out to our engineering team to get a precision-built, permit-ready BOM for your next solar installation.