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A solar power project’s cost includes more than its panels: inverters, mounting and electrical equipment, site work, installer and developer labor, and—on ground-mounted projects—land-related costs all affect the total. For a U.S. reference point, the U.S. Department of Energy and National Laboratory of the Rockies’ 2025Q1 benchmarks put a representative 8 kWdc residential rooftop system at $2.78–$2.95 per Wdc before storage, a 250 kWdc commercial rooftop system at $1.95–$1.98/Wdc, and a 100 MWdc utility-scale ground-mounted system at $1.07–$1.12/Wdc. Those are modeled benchmarks in 2024 dollars, not bids or universal prices; project type, cost definitions, storage, location, and grid connection matter.
What does a solar project budget pay for?
A solar budget is a collection of equipment, construction, and project-development costs. Panels and inverters are important line items, but they are only two parts of the installed system. The DOE’s PV System Cost Model (PVSCM) divides the owner’s overnight installed-system cash cost into eight categories: modules, inverters, energy storage when included, structural balance of system, electrical balance of system, fieldwork, office work, and other costs.
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The DOE describes the system cost as “the price paid by the system owner to the project developer.” That is a useful distinction: the benchmark is intended to represent a project owner’s system cost, rather than just the factory price of equipment. The DOE Solar Photovoltaic System Cost Benchmarks page and its 2025 benchmark description explain the model and its assumptions.
- Modules: the delivered photovoltaic panels that convert sunlight into direct-current (DC) electricity.
- Inverters: equipment that converts DC output to alternating-current (AC) electricity for use by building loads or delivery to the grid.
- Energy storage: battery equipment and associated system costs, listed separately when a project includes storage. It is not part of a PV-only total.
- Structural balance of system: structural hardware, including the mounting system that supports modules on a roof or ground-mounted structure.
- Electrical balance of system: electrical equipment and components other than the modules and inverters.
- Fieldwork: work performed at the installation site.
- Office work: installer work performed off site.
- Other: developer costs and overhead not assigned to another category.
The model groups the first five categories—modules, inverters, storage, structural balance of system, and electrical balance of system—as hardware. Fieldwork, office work, and other costs are soft costs. This breakdown helps explain why a panel-only price cannot be compared directly with a turnkey installed-system quote.
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What are the U.S. benchmark costs by project size?
The DOE/NLR 2025Q1 models provide distinct reference cases for residential rooftop, commercial rooftop, and utility-scale ground-mounted PV. The table shows the benchmark cost per watt of DC capacity, not an all-in bid for a particular site. Figures are in 2024 U.S. dollars; the benchmarks were published in 2025. Checked November 2026.
| Representative project | PV-only MSP | PV-only MMP | PV plus storage MSP | PV plus storage MMP |
|---|---|---|---|---|
| Residential rooftop, 8 kWdc | $2.78/Wdc | $2.95/Wdc | $4.33/Wdc | $4.59/Wdc |
| Commercial rooftop, 250 kWdc | $1.95/Wdc | $1.98/Wdc | $2.96/Wdc | $2.98/Wdc |
| Utility-scale ground-mounted, 100 MWdc | $1.07/Wdc | $1.12/Wdc | $1.71/Wdc | $1.81/Wdc |
MSP means minimum sustainable price: a modeled long-term sustainable price under the benchmark’s assumptions. MMP means modeled market price, which reflects current market conditions and temporary distortions in the model. These are two different modeled views, not a low and high quote guaranteed to be available to a buyer. The DOE/NLR benchmark documents describe the projects and definitions; they should be read alongside the figures rather than treating the numbers as bids.
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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →To make the residential benchmark more tangible, multiplying the per-watt figures by 8,000 Wdc gives an implied modeled total of about $22,240 at MSP or $23,600 at MMP for PV-only. For the 8 kWdc PV-plus-storage model, the corresponding arithmetic is $34,640 or $36,720. These are derived from the benchmark rates, not separate quoted prices, and do not include owner tax credits. The same calculation yields $487,500–$495,000 for the 250 kWdc commercial PV-only case and $107 million–$112 million for 100 MWdc utility-scale PV-only. Keep storage-inclusive totals separate: the modeled utility-scale PV-plus-storage case is $171 million at MSP and $181 million at MMP.
Scale is one reason the per-watt figures differ, but the models are not interchangeable price lists. A residential installation, a commercial rooftop, and a large ground-mounted plant differ in design, construction scope, and cost assumptions. Do not apply the utility-scale rate to a house, or infer a project bid by scaling a representative model alone.
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How much do panels and inverters contribute?
The supplied benchmark gives a physical configuration for each representative system, but not a retail panel or inverter price list. It therefore supports understanding what equipment the models assume, not calculating a universal percentage of total cost for panels or naming a product to buy.
The representative residential system is 8 kWdc, with twenty 400 W modules on a south-facing roof. Each module is paired with a 350 Wac microinverter, for 7.0 kWac total inverter output. The system’s inverter loading ratio is 1.14: the DC module capacity divided by the AC inverter capacity. This is a benchmark configuration, not a recommendation for a specific microinverter. A system designer must determine whether equipment is compatible with the roof, electrical design, and project requirements.
The representative utility-scale system is much larger: 100 MWdc of modules paired with 76 MWac of inverter capacity, with single-axis tracking. Its inverter loading ratio is 1.34. These details illustrate why a project described as “100 MW” needs a stated capacity basis: its DC module capacity is not the same as its AC inverter output.
For a homeowner comparing proposals, ask for the module and inverter makes and models, quantities, and capacities, then compare proposals with the same system size and storage configuration. A component’s nameplate price alone does not account for mounting, electrical equipment, installation labor, permitting, or developer overhead included in an installed system price.
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When does land add to solar project cost?
Land is a project-specific site issue, not a universal dollar-per-acre line that can be taken from these national cost benchmarks. The representative utility-scale project is ground-mounted: its modules and tracking structures occupy 155 hectares, and the model includes land lease, property tax, insurance, and management in utility-scale operations and maintenance (O&M). By contrast, the representative residential rooftop model has no land lease cost because it uses an existing building site.
That difference does not mean rooftop projects have no site costs, or that every ground-mounted project has the same land arrangement. Actual acquisition or lease terms, site preparation, access, and interconnection conditions depend on location and project structure. In a construction budget, keep the physical site and its carrying costs distinct from panels and mounting hardware. Also distinguish upfront construction scope from recurring O&M expenses: the DOE model includes the named land-related costs in utility-scale O&M, rather than treating every one of them as an upfront panel installation expense.
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What counts as installation—and what can be double-counted?
“Installation” is not a single category in the DOE model. On-site labor and construction activity fall under fieldwork; off-site installer effort is office work; and developer overhead or costs not otherwise classified appear under other. The mounting structure and electrical components are hardware categories in their own right.
This matters when reviewing an estimate. A turnkey price may already include labor, overhead, and other project costs. Adding a separate generic installation allowance on top of that price could count the same work twice. Conversely, a quote for modules alone is not an installed-project total. Ask the provider to identify included and excluded equipment, labor, site work, permitting, electrical upgrades, grid connection, and developer costs rather than relying on an undefined “installation” label.
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The DOE benchmark is an overnight cash-cost measure. It is not the same thing as the customer’s financed payment schedule, and owner tax credits are excluded. Financing costs and incentives should be considered separately, and only after confirming what a particular estimate includes. The benchmark documents’ definitions are important here: a project cost, a financing total, and a net cost after incentives answer different questions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should you compare two solar estimates?
First make sure the estimates describe the same kind of project and use the same cost basis. A lower quoted number can reflect a smaller scope, a different capacity denominator, a different dollar year, or omitted storage or grid-connection costs—not necessarily a more efficient project.
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- Match the project type and size. Compare rooftop with rooftop or ground-mounted with ground-mounted, and check the DC system size. The DOE examples are representative models, not direct substitutes for a site-specific design.
- Write down the capacity basis. Residential costs are commonly quoted per Wdc, while utility-scale sources may use Wdc or Wac. Wdc refers to module capacity; Wac refers to inverter or AC output. Always state which one is in the denominator.
- Confirm storage scope. Compare PV-only with PV-only and PV-plus-storage with PV-plus-storage. Batteries materially change the modeled totals, so do not treat a storage-inclusive figure as a solar-only price.
- Check the cost definition and date. Determine whether the number is an overnight modeled cost, a modeled market price, an observed completed-project cost, or a contractor proposal. Identify the dollar year and whether it is a gross or post-incentive figure.
- Check grid connection and site scope. Confirm whether grid connection, electrical upgrades, site preparation, and permitting are included. The NLR Annual Technology Baseline and other sources may use definitions that differ from the PVSCM benchmark; do not combine their figures without reconciling scope.
- Separate construction and operating costs. Land lease, property tax, insurance, and management appear within the utility-scale model’s O&M treatment. Check whether an estimate includes initial O&M or only construction-related costs.
- Compare proposal line items. For a residential project, ask which equipment, labor, permitting, electrical upgrades, and grid-connection items are included, and whether financing assumptions or owner incentives alter the presented total.
System design, installer margin, timing, included cost categories, and regional adjustments can all affect reported cost. The NLR 2025 Annual Technology Baseline residential PV model reports $3.15/Wdc residential installation CAPEX in 2024. Its utility-scale PV model reports $1.49/Wac of overnight capital cost plus grid connection in 2024. These are useful additional reference points, but they use their own model definitions and denominators; they should not be casually added to or substituted for the DOE PVSCM figures.
There is also an empirical point of comparison for utility-scale projects. Lawrence Berkeley National Laboratory reports an average installed cost of $1.43/Wac, equivalent to $1.08/Wdc, for a sample of 76 plants totaling 7.1 GWac completed in 2023. The reported average was down 8% from 2022. That observed project sample differs from DOE’s representative overnight-cost model in timing, cost definitions, and capacity basis, so the apparent proximity of some per-watt values does not make the datasets directly comparable. See the Berkeley Lab Utility-Scale Solar 2024 report for the empirical context.
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What should a residential buyer request before accepting a price?
Request at least two or more proposals for the same approximate system size and battery configuration, and compare the written scope rather than the headline price alone. Location affects system sizing, incentives, and installer availability, so a national benchmark cannot replace local proposals. EnergySage’s shopper help on getting and managing solar quotes describes a process for matching shoppers with installers; the useful principle is to compare like-for-like proposals and scrutinize what each includes.
- Ask for the proposed DC capacity and inverter AC capacity, with the units shown.
- Confirm whether the scope is PV-only or includes a battery, and list the storage capacity separately.
- Identify the modules, inverter type, mounting approach, and electrical equipment included.
- Ask whether permitting, site work, electrical upgrades, labor, utility or grid interconnection, and any required construction work are included or excluded.
- Clarify what the stated total assumes about financing and owner incentives; compare the project cost before incentives separately from any estimated net cost.
A construction-ready estimate should make scope boundaries legible. If a proposal leaves a major item ambiguous, request a written clarification before comparing it with another bid. That is especially important when one contractor quotes an installed system and another quote covers only equipment or excludes site-related work.
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What does Wdc mean on a solar estimate?
Wdc is watts of direct-current capacity, commonly tied to the modules’ rated output. It is not the same as Wac, which describes alternating-current inverter output; the two figures can both describe one project without being contradictory.
Does a solar benchmark include the federal tax credit?
No. The DOE PVSCM overnight cash-cost benchmark excludes owner tax credits. Treat any incentive-based net-cost calculation as a separate figure and confirm its assumptions and eligibility for the specific project.
Why can a completed-project cost differ from a DOE benchmark?
A completed-project dataset records actual projects with their own dates, designs, and reported cost scopes, while the DOE figure is a modeled representative overnight cost. Capacity basis and treatment of grid connection can differ too, so compare definitions before drawing conclusions from the per-watt figures.
Does a rooftop solar project need a land budget?
The representative residential rooftop model has no land lease cost because the system uses an existing building site. Roof condition, structural support, access, and electrical work are separate site questions and should be checked in the project scope.
