Solar Panels With or Without a Battery: Average Cost
A 6 kWp system costs {range:solar-pv:mid} before sales tax. Here is what each battery size adds to that total now the federal credits have ended.
The average cost of solar panels for a 6 kWp system is $24,700 before sales tax, with a typical range of $19,200 – $32,100. Adding a battery pushes the total higher, and with the federal credits gone, you now pay the full difference yourself.
This piece compares the installed price of the same 6 kWp system with no battery and with each battery size, so you can see what storage really adds. For the full breakdown of panels, inverter and labor, see our Solar panels guide.
What each battery size adds
These figures are mid-range, installed, and before sales tax. They come from our live cost model: labor hours × local rates, plus materials, checked against market prices and real quotes.
- No battery: $17,000
- 5 kWh battery: $24,700
- 10 kWh battery: $32,300
- 13.5 kWh battery: $37,600
The full comparison table is below, including the usual range and lifespan for each option.
| Material | Typical | Usual range | Lifespan |
|---|---|---|---|
| No battery | $17,000 | $13,300 – $22,100 | – |
| 5 kWh battery | $24,700 | $19,200 – $32,100 | – |
| 10 kWh battery | $32,300 | $25,200 – $42,000 | – |
| 13.5 kWh battery | $37,600 | $29,400 – $48,900 | – |
Subtract the "no battery" figure from any other row and you have the battery's true cost. That difference is what you need to justify through savings or backup power.
The credits are gone
Federal tax credit 25D, which covered solar and batteries, does not apply to expenditures after 31 Dec 2025. Credit 25C also ended for property placed in service after that date (IRS). Any quote that still assumes a 30 percent reduction is out of date.
That changes the battery decision. Before, the credit softened the extra cost. Now the battery must earn its place on its own merits.
When a battery makes sense
A battery is easier to justify in some situations than others:
- You lose power often. Backup is the one thing panels alone cannot do. Most grid-tied systems shut down during an outage.
- Your utility pays little for exported power. Storing midday output for the evening is worth more when exports earn less than you pay to buy power back.
- Your rates change by time of day. Shifting use out of expensive evening hours is where a battery saves money.
- You can get a rebate. Some states run IRA home energy rebate programs (HEAR/HOMES), and utilities often offer rebates. Availability varies, so check the DSIRE database for state and utility incentives before you sign.
If none of these apply, panels without a battery are usually the simpler purchase. You can often add storage later, though it is worth asking the installer whether the inverter and wiring are ready for it.
Sizing: bigger is not always better
A 5 kWh battery covers essentials like a fridge, lights and internet for a limited time. A 13.5 kWh unit can carry more of an evening. Whole-home backup, including air conditioning or an electric range, needs far more than any of these sizes, so be clear with installers about what you want to keep running.
Pay for the capacity you will use. The step from one size to the next adds a clear amount to the total, as the figures above show.
Hidden costs to check
Quotes for the same system can differ for reasons that have nothing to do with the panels:
- Electrical panel. An older or full panel may need work before solar goes in. If yours is tight, see our House rewiring guide for what electrical upgrades involve.
- Roof condition. Panels last for decades, so an aging roof is better replaced first. Removing and refitting panels later adds cost. Our Roof replacement guide covers the price.
- Permits. Electrical and structural work usually needs a local permit. Ask whether it is in the quote.
- Sales tax. It varies by state and applies to materials. Our figures are before tax, so add it to your budget.
If you also plan to charge a car at home, an EV charger installation installation shares the same panel capacity, so plan both together.
How to compare quotes
Ask every installer to price the system twice: once without a battery, once with. Then check the battery line against the table above. A gap well outside the usual range deserves a question.
Our quote checker (the "is my quote fair" tool) lets you enter your figures and see how they compare with our model. It is a quick way to spot an inflated battery line or a missing item.
Bottom line
Panels alone give the lowest cost and the shortest payback. A battery adds a fixed premium for backup and for shifting power use. With the federal credits ended, treat it as a separate purchase, and only buy it if outages, low export rates or time-of-use pricing make it worth the money.