Installation cost · Home systems and energy
Home battery storage cost
$13,120
Derived incremental ESS (8 kW / 13.5 kWh)
CostMage-derived from sourced inputs
- Unit / scope
- DOE PV+ESS MMP $4.59/Wdc and the labeled derived increment (4.59 − 2.95) × 8,000 W = $13,120.
- Data period
- 2025Q1 / 2024 USD
- Source
- U.S. Department of EnergyUnited States — DOE PV+ESS benchmark configuration
- Last verified
- 2026-09-06
The $13,120 figure is a CostMage-derived incremental ESS amount locked to DOE’s 8 kW / 13.5 kWh case, not a retail pack quote.
Additional sourced observations are listed below and are not blended into this headline.
How to use this figure
Use this page only for the DOE paired case: the incremental storage amount implied by the PV+ESS benchmark minus the PV-only benchmark at 8 kW and 13.5 kWh.
- Read $4.59/Wdc and $2.95/Wdc as the two DOE benchmarks.
- Follow the labeled derivation: the difference times 8,000 W is $13,120.
- Stop there. A different kWh size is not a supported input.
What the result means
$13,120 is a CostMage derivation for that one configuration. DOE published the two unit prices. DOE did not publish $13,120 as a retail pack.
A comparison that stays on this source
The solar page can scale PV-only kilowatts. This page cannot scale battery kWh, because only one pairing was sourced.
If the number looks wrong
- A retail quote for a different chemistry or size will not match $13,120. That mismatch is expected.
- Incentives are not subtracted.
This is not a shop-by-brand battery price.
Record last verified 2026-09-06. That date is the record’s verification stamp, not a claim that a market price is unchanged today.
Installation evidence on this page is a cited range or labeled derivation. No free-form calculator is offered.
Moderate evidence confidence
Moderate evidence confidence is an internal CostMage evidence-quality score (64 of 100). It describes source strength and extract completeness, not the probability that a quoted figure matches your bill.
Labels: 75–100 high, 60–74 moderate, below 60 limited. The number is not a probability that the cost is correct.
No invented calculator
This record is estimator partial. CostMage will not render controls that invent a formula the sources do not support.
What this figure covers
- Included
- DOE PV+ESS MMP $4.59/Wdc and the labeled derived increment (4.59 − 2.95) × 8,000 W = $13,120.
- Excluded
- A free kWh slider, Tesla or Enphase retail quotes, and standalone battery installs outside that DOE configuration.
Worked example
CostMage derivation: ($4.59 − $2.95) × 8,000 W = $13,120 for the DOE 8 kWdc + 13.5 kWh case only.
Sourced observations
| What was published | Figure | Claim kind | Note |
|---|---|---|---|
| Derived incremental ESS (8 kW / 13.5 kWh) | $13,120 | CostMage-derived from sourced inputs | (4.59 − 2.95) × 8,000 W. Benchmark, not a retail quote. |
| DOE PV+ESS MMP | $4.59 | Source-stated | 8 kWdc + 13.5 kWh ESS. |
Sources
CostMage shows what the source published. Derived figures are labeled. We do not claim partnership with these publishers.
Source 1 · Tier 1 · SAFE FACTUAL USE
Solar Photovoltaic System Cost Benchmarks 2025Q1
- Publisher
- U.S. Department of Energy
- Published / dated
- 2025
- Data period
- 2025Q1 / 2024 USD
- Last verified by CostMage
- 2026-09-06
PV+ESS MMP $4.59/Wdc vs PV-only $2.95/Wdc.
What changes the cost
- Whether PV is installed at the same time
- Usable kWh
- Backup panel work
Methodology
CostMage shows the official PV+ESS $/W and a labeled derived incremental total for the 8 kW / 13.5 kWh DOE configuration. No free size slider, because scaling that pack independently would invent a model.
Limitations
- Derived figure is locked to the DOE 8 kW / 13.5 kWh case.
- Not a Tesla or Enphase retail quote.
Questions
Why can’t I type a custom kWh?
The only sourced relationship is the DOE 8 kW / 13.5 kWh incremental difference. A free kWh slider would be invented.
Did DOE publish $13,120?
DOE published the two $/Wdc benchmarks. The subtraction and 8 kW scale are a labeled CostMage derivation.
Can I scale that to 20 kWh?
No. The only sourced pairing is 8 kW / 13.5 kWh. Scaling kWh independently would invent a model.
Related cost pages
- Residential solar panel installation costMultiply a selected DOE 2024 $/Wdc rate by the kW you enter. LBNL buyer-paid percentiles stay in a separate table and are not blended into that total.
- U.S. residential electricity costOfficial EIA average revenue per kilowatt-hour for U.S. residential customers, with same-table state examples.