HomeExpertly
www.homeexpertly.com

Solar Battery Calculator (USA)

Size a home battery and see what it actually returns. Get your net cost after the federal tax credit, how long the battery runs your critical loads in an outage, annual bill savings, and the year you break even.

For estimation purposes only. Tax credit eligibility and rebate terms vary — confirm with a tax professional and your installer.
1 Your home energy use
/kWh
$0.05$0.32$0.60
%
EssentialsMostWhole home
/yr
hrs
/hr
2 Battery system
kWh
5 kWh32 kWh60 kWh
%
%
yrs
Backup only — savings come from avoided outage costs.
3 Costs & incentives
/kWh
Leave blank to auto-calculate, or paste the number from your quote.
%
yrs
%
% / yr
Net cost after incentives
—
Enter your details and click Calculate
System highlights
Net cost after incentives —
Annual savings —
Payback period —
Net savings over period —
Backup runtime —
Usable capacity —
Where the savings come from
Calculate to see breakdown
Your energy profile
Monthly usage—
Annual usage—
Average daily usage—
Electricity rate—
Critical daily load—
Critical average draw—
Outage hours / yr—
Current annual bill—
Battery system
Primary purpose—
Nominal capacity—
Usable capacity—
Delivered per cycle—
Round-trip losses—
Cycles used per year—
Energy shifted / yr—
Estimated service life—
Capacity at end of period—
Backup runtime—
Outages fully covered—
Costs & incentives
Gross installed cost—
Cost per usable kWh—
Federal tax credit—
State / utility rebate—
Net cost after incentives—
Savings analysis
Bill savings / yr—
Outage value / yr—
Total savings / yr—
Savings / mo—
Payback period—
Return on investment—
Gross savings over period—
Levelized cost of storage—
Net savings over period—
Visualizations
Cumulative net position
System cost & incentives
Disclosure: This calculator provides estimates for informational purposes only and does not constitute tax, financial, or engineering advice. Federal tax credit eligibility depends on your tax situation and current law. Real backup runtime depends on which circuits are wired to the backup panel and on actual loads at the time of the outage. Confirm system sizing with a licensed installer and credit eligibility with a tax professional.