Battery Storage Cost in Washington
Home battery prices, incentives, and solar+storage savings for Washington homeowners in 2026.
Washington Battery Storage Overview
The average cost of home battery storage in Washington is $971 per kWh of storage capacity. A typical 10 kWh system costs approximately $9,710 before incentives, or $6,797 after the 30% federal Investment Tax Credit (ITC).
Even with 3.6 average peak sun hours, Washington homeowners can achieve 50-70% grid independence with a well-designed solar-plus-storage system. Battery storage maximizes the value of every kilowatt-hour generated by storing surplus solar for use when the sun isn't shining.
Popular Battery Systems in Washington
| Battery System | Capacity | Power | Installed Cost | Warranty |
|---|---|---|---|---|
| Tesla Powerwall 3 | 13.5 kWh | 11.5 kW | $12,000 - $14,500 | 10 years |
| Enphase IQ Battery 5P | 5 kWh | 3.84 kW | $6,000 - $8,000 | 15 years |
| Franklin WholHome | 13.6 kWh | 5 kW | $13,000 - $16,000 | 12 years |
| SolarEdge Home Battery | 9.7 kWh | 5 kW | $10,000 - $13,000 | 10 years |
Solar + Battery Storage in Washington
Solar Only
- Export excess to grid during the day
- Buy power from grid at night
- No backup during outages
- Savings depend on net metering rates
Solar + Battery
- Store excess solar for nighttime use
- Additional 10% savings vs solar alone
- 6+ hours backup power
- While Washington has relatively moderate electricity rates, battery storage still provides peak shaving value of $15-$40/month for homeowners on time-of-use plans, plus the added benefit of backup power during outages.
Battery Storage FAQ - Washington
The average cost of home battery storage in Washington is $971 per kWh. A typical 10 kWh system costs $9,710 before incentives, or $6,797 after the 30% federal tax credit.
Popular battery systems in Washington include Tesla Powerwall 3, Enphase IQ Battery 5P, Franklin WholHome, SolarEdge Home Battery. The best choice depends on your backup needs, budget, and whether you have existing solar panels. The Tesla Powerwall 3 is the most popular choice nationally due to its high power output and competitive pricing.
Washington does not currently have a dedicated state battery incentive program, but the 30% federal Investment Tax Credit applies to all battery installations with 3+ kWh capacity, reducing your cost by nearly a third.
A typical home battery in Washington can provide 6+ hours of backup power for essential loads like lights, refrigerator, WiFi, and phone charging. For whole-home backup during extended outages, you may need multiple batteries or a larger system like the Generac PWRcell.
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