Solar Estimating Is Not Just Electrical on the Roof: What Contractors Need to Know

The commercial and industrial solar market has expanded at a rapid pace, and this has opened tremendous opportunities for electrical contractors. However, many companies that have ventured into the photovoltaic (PV) industry have soon realized that solar estimating is a process that requires a different approach altogether.

Although solar projects involve electrical components, they also involve system-level design, structural elements, and manufacturer-defined layouts that are quite different from traditional power distribution, low voltage, and datacom projects.

Contractors who consider solar projects to be “just another electrical project” tend to underestimate the labor costs, forget to include balance-of-system components, or incorrectly price manufacturer-defined equipment.

To successfully and profitably bid solar projects, solar estimators need to understand solar construction as what it is: a fully integrated energy system.

Solar Estimating Begins With the Entire System; Not Individual Parts

In traditional electrical contracting, estimating begins with items and then progresses to things like feeders and branch circuits.

Not so in solar estimating.

A solar photovoltaic system needs to be analyzed as a complete energy-generating system that comprises:

• Solar modules
• Mounting or racking systems
• Inverters
• DC and AC wiring
• Combiner boxes and disconnects
• Monitoring systems
• Grounding and bonding systems

Each of these components affects and is affected by the other components. For instance, an increase in the number of solar modules will require an increase in the size of the inverters. The type of mounting system used affects the amount of hardware and labor required. The layout affects the length of the conductors and the amount of trenching work, if required.

Experienced solar estimators incorporate all these factors into their solar estimating process.

Using assemblies in IntelliBid, solar estimators can group related components together, ensuring that when system quantities are changed, material and labor are properly synchronized.

Labor Is the Most Unpredictable Factor in Solar Projects

In solar projects, labor is less likely to increase linearly.

Two 500 kW solar projects can have vastly different labor hours depending on:

• Roof slope and height
• Roof vs. ground mount
• Soil type for foundations
• Material staging and accessibility
• Weather exposure
• Experience with particular racking systems

Solar project estimating involves precise adjustments to labor units depending on actual site conditions.

IntelliBid’s labor-based estimating framework enables solar estimators to assign labor units at the item or assembly level with extensions to account for installation difficulty. Instead of using percentage adders, labor units can be applied thoughtfully and consistently.

This degree of control is critical to maintaining margins in a competitive solar market.

Balance-of-System Materials Are Easily Overlooked

New solar contractors tend to emphasize modules and inverters, the most visible parts of a solar installation.

However, profitability often depends on accurate representation of “balance-of-system” materials, such as:

• Mounting hardware
• Flashings and roof attachments
• Wire management parts
• Grounding hardware
• Fasteners and connectors
• Labels and identification materials

These smaller parts add up quickly in a large solar installation. Consistently forgetting them can damage project margins.

By breaking down materials into structured assemblies in IntelliBid, solar estimators can avoid forgetting critical parts of a solar installation.

Solar Projects Are Often Manufacturer-Specific

Solar project construction is highly manufacturer-centric. Module manufacturers, inverter suppliers, and racking systems differ in:

• Cost profiles
• Installation complexities
• Mounting hardware design
• Availability and lead times
• Warranty and compliance standards

Specifications can include multiple approved manufacturers, or change late in the bidding process due to availability.

To accommodate this reality, IntelliBid enables estimators to create solar estimates with generic placeholders (available upon request).

This process has two key benefits:

• Scope and labor can be defined early without committing to a brand.
• Changes to manufacturers do not require rebuilding the entire estimate.

In a market where supply chain dynamics can change rapidly, this is a vital consideration.

Solar Bids Need to be Presented with Clear Cost Analysis

Solar installations involve:

• Equipment sales
• Structural installation
• Electrical connections
• Monitoring and commissioning
• Optional add-ons or alternates

A clear cost analysis helps solar contractors present professional bids and negotiate effectively.

IntelliBid enables estimators to create estimates with items organized in a logical manner, use alternates for optional items, and create summaries that clearly reflect the total system costs.

For commercial solar contractors competing in design-build or negotiated markets, solar estimating transparency enhances credibility.

Solar Estimating Is a Discipline, Not a Shortcut

The most successful solar contractors estimate with:

• System-level thinking
• Standardized assemblies
• Realistic labor modifications
• Manufacturer flexibility
• Consistent scope capture

Solar installations can be highly profitable, but only when estimates are organized, repeatable, and defensible.

By combining assembly-based estimating, labor-unit control, generic placeholders, substitutions, and organized summaries, IntelliBid provides a framework that supports disciplined solar estimating processes.

This disciplined approach is why contractors turning to photovoltaic construction rely on IntelliBid to estimate solar projects with the same level of accuracy and control they require in electrical and low-voltage work, supported by decades of estimating expertise from Conest Software Systems.