Most commercial solar quotes hide the answer to one question
A commercial solar bid can run forty pages and still leave you guessing on the three numbers that matter most. What does it cost per watt? What will it actually produce? When does it pay for itself?
If you are a business owner in Dallas-Fort Worth with a warehouse, a manufacturing floor, or a multi-tenant building, you have probably seen a few of these proposals already. Some read like engineering reports. Some read like sales brochures. The job of this article is to show you how to strip both down to the same set of numbers and compare them side by side.
DFW Solar Electric has installed and maintained commercial solar systems across North Texas for nearly two decades. We are licensed and insured, and we write quotes the way a CFO wants to read them. Here is what to look for in yours.
What a complete commercial quote should show you
A commercial system is not a residential system with more panels bolted on. It is a capital project, and the quote should read like one. If your proposal does not break down into the items below, ask for a line-item revision before you spend another minute on it.
- Total system size in kilowatts (kW), rather than a panel count
- Equipment spec sheets for the panels, inverters, and racking
- Annual production estimate in kilowatt-hours, with the model assumptions stated
- Labor, engineering, permitting, and interconnection as separate line items
- Total installed cost, stated in dollars and dollars per watt
Dollars per watt is the single most useful comparison figure you have. Take the total installed cost and divide by the system size in watts. A 200 kW system quoted at $400,000 is $2.00 per watt. A 200 kW system quoted at $500,000 is $2.50 per watt. Same output, same roof, two very different numbers.
The difference between those two bids is usually soft costs, not hardware. Panels and inverters cost roughly the same from one installer to the next. What varies is engineering margin, overhead, and profit. A good quote does not hide that variation. It shows it to you, line by line, so you can ask the right questions.
Watch the production estimate closely too. A quote that promises annual output with no mention of panel tilt, shading, or the specific inverter pairing is guessing. The production model should name its assumptions, and those assumptions should match your roof, not a best-case scenario.
DFW sits inside the ERCOT grid, which means business owners in Dallas, Fort Worth, Arlington, and the surrounding suburbs buy power from a retail provider at rates that shift with wholesale market conditions. Summer afternoons are the expensive hours, and that is precisely when a commercial array produces the most. A system that shaves your peak is worth more per kilowatt-hour than one that only offsets your overnight baseload, which is why the quote should model production against your actual time-of-use profile, not a flat blended rate.
Red flags to watch for in a commercial bid
Some proposals are written to close, not to inform. They share a handful of tells. Here are the ones we see most often in the DFW market.
|
Red flag |
What it looks like |
Why it matters
|
|---|---|---|
|
No dollars-per-watt figure |
Quote lists a total price only, or buries the math |
You cannot compare bids or spot a padded margin |
|
No production estimate |
Promises savings without a modeled kWh number |
Without output, there is no way to size payback |
|
Capacity and production mismatch |
System size claims output that the roof cannot physically support |
Signals a model built to sell, not to perform |
|
High-pressure close |
Discount "expires Friday" or a demand to sign before an energy audit |
A real project can wait a week for a second bid |
|
Hidden or vague soft costs |
Engineering, permits, and interconnection lumped into "other" |
That line is where unexpected overruns live |
The capacity and production mismatch deserves its own warning. A proposal might advertise a 300 kW system and a six-figure annual savings figure, but the savings math depends on the system actually producing what the model claims. If the panels are shaded by a neighboring structure, or the inverter is undersized for the array, real output falls short and the whole ROI case quietly collapses. Ask the installer to show the shading analysis and the inverter sizing. If they will not, that is a signal.
High-pressure tactics are easier to spot than you think. A legitimate commercial installer will give you a week to get a second quote. A legitimate installer knows a $400,000 decision deserves review by your controller and your tax advisor. Anyone who rushes that process is not confident their number survives scrutiny.
Four checks to run before you sign
Once you have two or three quotes in hand, run them through this sequence. Each check filters for a different kind of risk, and together they cover the places where commercial solar projects go wrong.
- First, the site assessment. A real quote starts with someone walking your roof or your ground site, measuring usable square footage, checking structural load, and pulling a year of your interval meter data. If the quote arrived without a site visit, the production model is built on assumptions, not your building.
- Second, the production estimate. Put the annual kWh figure against your actual consumption from the utility. A system sized to cover your daytime load is a different project from one sized to your total bill. The estimate should show both, and it should account for peak summer demand in DFW, when air conditioning drives your highest charges.
- Third, the financing terms. Commercial projects get financed through loans, leases, or power purchase agreements. Each carries a different cost of capital and a different claim on the tax credits. We covered the mechanics in our post on how to finance solar panels, but the short version is this: know who owns the system and who keeps the credits, because that answer changes your payback by years.
- Fourth, the contract. Read the performance guarantee, the warranty terms, and the maintenance scope. A commercial system should carry a production guarantee, beyond a parts warranty. If the contract promises output but no one is on the hook if output falls short, the guarantee is marketing.
How the Section 48E tax credit works
The federal incentive for commercial solar is the Section 48E investment tax credit. It is still active, but it is phasing down, which is why the timing of your project matters as much as the price.
Section 48E lets a business claim a credit equal to a percentage of the installed cost of an eligible system, taken against federal tax liability in the year the system is placed in service. For a qualified project, that base credit is currently up to 30 percent of the installed cost. The credit is dollar for dollar, which means a $400,000 system can offset up to $120,000 of federal tax owed, subject to eligibility and any applicable phase-down rules.
The phase-down is the part most owners overlook. The credit is scheduled to step down after 2026, and the percentage you qualify for locks in based on when the system is placed in service, not when you sign the contract. A project that slips into the next tax year can fall into a lower tier. For a six-figure system, that difference can be tens of thousands of dollars. There is a second timing rule worth knowing. The credit offsets tax owed, so a business with limited federal liability in a given year may carry the credit forward or use other structures to monetize it. This is where your tax advisor earns their fee. The credit is real, but capturing it fully requires planning around your specific liability profile.
Depreciation and the property tax exemption
Two incentives sit below the tax credit, and most owners only hear about one of them.
Commercial solar qualifies for accelerated depreciation under the Modified Accelerated Cost Recovery System, or MACRS. The system is treated as five-year property, which means you recover the cost through depreciation deductions faster than the equipment physically wears out. On top of the five-year schedule, first-year bonus depreciation lets you deduct a large share of the cost in year one instead of spreading it evenly. That bonus percentage has been stepping down each year, so confirm the current rate with your tax advisor. The point stands: a commercial solar system generates a meaningful depreciation deduction in the first few years, which improves the after-tax economics well before the payback period ends.
The second one costs you nothing and is easy to miss. Texas property tax code section 11.27 exempts the added value of a solar installation from your property tax assessment. In plain terms, your building's taxable value does not jump just because you added a solar system. For a commercial owner in a DFW county with rising appraisals, that exemption quietly protects your return. Unlike the federal credit, it is not phasing down.
Together, the three stack. The Section 48E credit lowers the up-front cost. MACRS depreciation lowers taxable income in the early years. The property tax exemption keeps your assessment flat. Run all three through your controller's model, beyond the sticker price, and the payback on a well-built system frequently lands in the five-to-ten-year window for a 50 kW to 500 kW project.
The 90-day timeline from contract to live system
Commercial solar does not install itself in a weekend. A realistic timeline from signed contract to energized system in DFW runs about 90 days, and knowing the sequence keeps you from signing a schedule that was never going to hold.
Weeks one and two are engineering and design. The installer finalizes the electrical drawings, the structural review, and the system layout. Weeks three through six are permitting and interconnection. Your local municipality reviews the plans, and your utility, which in DFW means an ERCOT-connected retail provider behind your own meter, reviews the interconnection application. These two approvals run in parallel and neither can be rushed. Weeks seven through ten are procurement and construction. Panels and inverters arrive, the array goes up, and the wiring is completed. The final weeks are inspection and commissioning, ending when the utility signs off and the system begins producing.
Delays in a commercial project almost always trace to one of two places: a permit correction the design missed, or an interconnection queue that was not filed early. Both are preventable with an installer who files the interconnection paperwork the same week the contract is signed. Ask when that filing happens. If the answer is vague, the 90-day timeline is already at risk.
What to expect after the system goes live
Signing the contract is the midpoint, not the finish line. The first three months after energization tell you whether the quote you accepted is the system you got.
Production will come in under the annual estimate in the first few months, and that is normal. Solar output in North Texas is highest in summer and lowest in winter, so a system commissioned in late summer will produce less than the model's monthly average. Judge performance against the full first year, not the first billing cycle. Your monitoring platform should show daily production against the model, and any gap of more than a few percent should trigger a conversation with the installer, not a shrug.
Peak demand is where commercial solar earns its keep in DFW. ERCOT summer prices climb with air conditioning load, and a system sized to shave your afternoon peak can cut the demand charges that make up a large slice of a commercial bill. A warehouse running cooling and refrigeration during the hottest hours of July pays for power at its most expensive moment. A solar array that is producing exactly then is offsetting the highest-cost kilowatt-hours, not the cheap overnight ones. That benefit does not show up neatly on a residential-style savings chart, which is another reason the production model and the rate analysis have to be built for your specific meter, not a generic one.
If you are weighing commercial solar bids and want a second read on the numbers, talk to a solar expert. Bring the quotes you have. We will walk the line items, check the production assumptions against your meter data, and tell you whether the ROI case holds before you commit a dollar.
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