Resource Guide

Commercial Solar 101

Everything a business owner or facility manager needs to understand commercial solar before talking to an installer.

The Basics

How does commercial solar work?

Photovoltaic (PV) solar panels convert sunlight into DC electricity, which an inverter converts to AC power used by your facility. When the system produces more electricity than the facility consumes, excess power flows to the utility grid (earning credits under net metering programs). When the system produces less than you consume, the shortfall is drawn from the grid as normal. A monitoring system tracks production, consumption, and export in real time.

What is the difference between commercial and residential solar?

Commercial solar systems are significantly larger (typically 50 kW to multi-MW vs. 5-20 kW residential), use different equipment (string inverters or central inverters vs. microinverters), require structural engineering for the roof or racking system, must navigate commercial utility rate structures with demand charges, and involve longer permitting and interconnection timelines. The financial incentives are also different — commercial solar uses the Section 48E Investment Tax Credit, while the residential 25D credit expired December 31, 2025.

What is a kW vs. kWh for commercial solar?

A kilowatt (kW) is a measure of power — the instantaneous capacity of your solar system. A kilowatt-hour (kWh) is a measure of energy — the amount of electricity produced or consumed over time. A 500 kW solar system produces roughly 500 kWh per hour of full-sun production. Annually, a 500 kW system in a mid-sun market might produce 600,000-700,000 kWh, depending on location and local irradiance.

How much of my electricity bill can commercial solar offset?

Most commercial solar systems are sized to offset 20-80% of a facility's annual electricity consumption, depending on available roof space or land, facility electricity demand profile, and budget. Very large facilities with modest roof areas relative to their consumption may achieve 10-20% offset. Facilities with large flat roofs relative to their consumption may offset 80-100%. Our EPC partners model the exact production and offset percentage for your specific facility during the proposal process.

The Installation Process

What does the commercial solar installation process involve?

A commercial solar installation involves: (1) Energy audit and system design, (2) Structural engineering and roof assessment, (3) Permit application (building, electrical, fire), (4) Utility interconnection application, (5) Equipment procurement, (6) Physical installation, (7) Inspection and Permission to Operate. The process typically takes 5-9 months from signed contract to system activation, with the majority of time spent in permitting and interconnection approval.

Does a commercial solar installation disrupt business operations?

Minimal disruption is expected for most commercial installations. Physical installation takes 1-4 weeks depending on system size, primarily involves rooftop work that does not impact interior operations. Electrical work requires brief power shutdowns (typically 1-4 hours) coordinated with your facility team. Our EPC partners schedule all work to minimize operational impact and communicate the shutdown schedule in advance.

What maintenance does commercial solar require?

Commercial solar systems require minimal maintenance. Panels should be cleaned periodically (1-2 times per year in dusty climates, less in rainy markets) to maintain production efficiency. Inverters have operational lifespans of 10-15 years and may require replacement during the 25-year system life. Monitoring systems alert operators to any production anomalies. Our EPC partners offer monitoring and maintenance service contracts as an optional addition to the installation.

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