Solar Battery Storage Calculator for Washington
See whether adding battery storage to your solar system makes financial sense in Washington. With full retail credit net metering and average electricity rates of 12.5¢/kWh, here is how battery storage stacks up.
Net Metering
Full Retail Credit
Electricity Rate
12.5¢/kWh
Avg Sun Hours
3.5h/day
Avg Monthly Bill
$125
Battery Storage Calculator for Washington
Battery Cost
$12,825
before incentives
After 30% ITC
$8,978
net cost
Payback Period
30.4 years
Annual Savings
$296
Backup During Outage
10.8 hours
of essential-load backup with a 13.5 kWh battery
25-Year Savings Comparison
Solar Without Battery
$33,087
25-year net savings
Solar + Battery
$35,212
25-year net savings
Net Metering Policy: Full retail credit. Battery storage adds backup power but may not significantly increase financial savings since excess solar is already credited at full retail rate.
Estimates based on average electricity costs in Washington. Battery costs reflect current market averages including installation. Actual savings depend on your utility rate structure, usage patterns, and local incentive programs. Consult a solar advisor for a personalized quote.
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