Contents
- Solar installation costs statistics: 2025 residential benchmark prices
- Solar installation costs statistics: system size and residential price variation
- Solar installation costs statistics: residential installed-price trends
- Solar installation costs statistics: paired solar and battery costs
- Solar installation costs statistics: installer and financing price variation
- Sources
Solar installation costs statistics: 2025 residential benchmark prices
The U.S. Department of Energy’s 2025 Q1 benchmark provides modeled reference prices for representative residential rooftop systems. For an 8 kW DC PV-only system, DOE reports a minimum sustainable price (MSP) of $2.78/W DC and a minimum market price (MMP) of $2.95/W DC. These are estimates for a defined system configuration, not averages from customer contracts or observed transactions. DOE states that benchmark values are in 2024 U.S. dollars and exclude subsidies payable to the system owner. Source: DOE, Solar Photovoltaic System Cost Benchmarks, Table 2
| DOE 2025 Q1 representative residential system | Configuration | MSP | MMP |
|---|---|---|---|
| PV-only | 8 kW DC | $2.78/W DC | $2.95/W DC |
| PV plus storage | 8 kW DC PV; 13.5 kWh storage | $4.33/W DC | $4.59/W DC |
The storage case combines 8 kW DC of PV with a 13.5 kWh energy storage system. Its $4.33/W DC MSP and $4.59/W DC MMP are prices for the modeled combined configuration. The per-watt denominator is the PV system’s DC capacity; battery capacity is separately stated in kWh. The figures therefore do not represent a stand-alone battery price. Source: DOE, Solar Photovoltaic System Cost Benchmarks, Table 1
DOE also gives annualized operations and maintenance (O&M) benchmarks: $34 per kW DC-year for the representative PV-only system and $64 per kW DC-year for the PV-plus-storage system. These figures amortize total O&M over system service life into a levelized annual cost. They describe ongoing service costs, rather than the upfront per-watt prices in the table. Source: DOE, Solar Photovoltaic System Cost Benchmarks, Tables 1 and 2
Solar installation costs statistics: system size and residential price variation
LBNL reports that the median residential PV system size was 7.4 kW in 2023. Most systems fell within the 5-to-11 kW range, which the report identifies as its 20th-to-80th-percentile band. This range describes the central part of the reported sample, not the full span of system sizes. Source: LBNL, Tracking the Sun: Pricing and Design Trends for Distributed Photovoltaic Systems in the United States, 2024 Edition, p. 13
System size also corresponded with a difference in installed prices. Among residential systems installed in 2023, median prices for the largest systems were roughly $1.0/W lower than for the smallest systems. This is a comparison between the smallest and largest system groups; it does not give a price for every capacity or a step-by-step price schedule. LBNL’s price measure is expressed in real 2023 dollars per W DC, and its analysis concerns stand-alone PV unless otherwise specified. Source: LBNL, Tracking the Sun, p. 37
The reported size distribution and price comparison help explain why one per-watt figure cannot describe every residential installation. The median system size summarizes the sample’s midpoint, while the price contrast compares its smallest and largest groups. LBNL’s report covers U.S. grid-connected distributed PV through 2023. Installed price means gross upfront price per DC watt before incentives, so it should not be read as a household’s after-incentive cost. Source: LBNL, Tracking the Sun, pp. 13, 37
Solar installation costs statistics: residential installed-price trends
For residential stand-alone PV, LBNL reports that the national median installed price fell by roughly $0.1/W from 2022 to 2023 in real, inflation-adjusted terms. Looking across the preceding decade, the report describes prices as falling at a relatively steady pace of about $0.1–$0.2/W per year. That is LBNL’s historical characterization in its 2024 report, not a projection for later years. Source: LBNL, Tracking the Sun, p. 31
Over the more recent interval from 2021 to 2023, quarterly median residential stand-alone PV prices declined by roughly $0.5/W in real terms. Because the comparison is inflation-adjusted, it should not be conflated with nominal contract prices from different years. It describes median prices across the systems analyzed, not the change in the price of an individual household’s installation. Source: LBNL, Tracking the Sun, p. 32
LBNL defines installed price as the gross upfront amount paid by the system owner, in 2023 dollars per DC watt and before incentives. It includes upfront loan fees passed through by the installer. The report excludes third-party-owned and self-installed systems from its installed-price analysis. These definitions matter when comparing the historical medians with a retail quote, an after-incentive amount, or a benchmark using another cost measure. The reported changes are historical observations through 2023. Source: LBNL, Tracking the Sun, pp. 31–33
Solar installation costs statistics: paired solar and battery costs
In LBNL’s paired residential system sample, the majority of systems used a single battery with either 10 or 13.5 kWh of storage. The majority configuration also had a rated maximum continuous power output of 5 kW. These are common characteristics in the report’s sample, not specifications for every residential solar-and-battery installation. Source: LBNL, Tracking the Sun, p. 23
LBNL describes most residential batteries in the sample as having a duration of 2 to 2.7 hours, given those energy and rated-output specifications. Duration is a characteristic of the battery configuration discussed; it does not say how long a battery would serve a particular home under its actual usage conditions. Source: LBNL, Tracking the Sun, p. 23
DOE’s modeled 2025 Q1 storage benchmark offers a separate cost reference: 8 kW DC of PV paired with 13.5 kWh of storage, at $4.33/W DC MSP and $4.59/W DC MMP. LBNL’s sample describes observed system characteristics, while DOE’s figures are modeled prices for a representative configuration. They cover different periods and should not be treated as the same type of statistic. Sources: DOE, Solar Photovoltaic System Cost Benchmarks, Table 1; LBNL, Tracking the Sun, p. 23
Solar installation costs statistics: installer and financing price variation
LBNL found substantial variation among the top 100 host-owned residential installers in 2023. Ignoring outliers, their median prices ranged from $2.6/W to $5.9/W. Roughly one-third of these installers had median prices below $4/W, roughly one-third were between $4 and $5/W, and the remaining third were above $5/W. These are installer-level medians and shares of the selected installer group, not a distribution of every household quote. Source: LBNL, Tracking the Sun, p. 39
Financing is another part of price interpretation. LBNL says Tracking the Sun prices likely include dealer fees for loan-financed systems, which may add 5–50% to the overall reported price for those systems. The estimate concerns loan-financed prices in the report; it is not a standard charge applying to every loan or cash purchase. Source: LBNL, Tracking the Sun, p. 33
LBNL’s econometric analysis of host-owned residential systems installed in 2023 used 266,903 observations and reported an R² of 0.12. The first figure is the model’s observation count; the second describes its fit. The reported R² indicates that the model accounts for only part of the observed price variation. By itself, it does not identify why a particular installation cost more or less. Source: LBNL, Tracking the Sun, p. 42
For comparison, keep the periods and definitions attached to each figure: DOE’s 2025 Q1 benchmark is modeled in 2024 U.S. dollars, while LBNL’s observed installation and installer statistics describe projects through 2023 using real 2023 dollars per DC watt. System configuration, size, installer, and financing treatment all frame what a reported residential solar price represents.