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Free solar battery storage calculator for estimating usable stored energy, backup runtime, annual electricity offset value, and simple payback for residential or small commercial systems. Explore more in our energy and sustainability calculator category.
Last updated: April 9, 2026
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Daily Solar Production
28.8 kWh
Usable Battery Energy
12.2 kWh
Backup Duration
10.4 h
Grid Offset
39.9%
Simple Payback
15.5 years
Annual Stored Energy & Value
4080 kWh/yearEstimated annual bill offset: $775
Storage design is reasonably aligned with your current solar and consumption profile.
Improves self-consumption and reduces grid dependency during peak tariff windows.
Useful for regions with weather-related outages or reliability concerns.
Can improve storage economics where utility tariffs have strong peak/off-peak spread.
Lower protected-load demand can significantly increase backup-duration outcomes.
Supports mixed goals when both savings and reliability matter.
Scenario testing helps avoid undersizing if household electricity demand will increase.
For 28 kWh/day use, 7.5 kW solar, and 13.5 kWh battery:
Usable Storage
12.2 kWh
Estimated Backup
10.4 hours
The calculator combines solar-production assumptions, battery efficiency, and household load profile to estimate storage-backed energy value and backup runtime. It is designed for screening scenarios before detailed engineering design.
Results are directional and improve when inputs reflect utility tariff structure, battery controls, and critical-load design assumptions.
Solar Production → Battery Usable Energy → Backup Runtime → Annual Value & Payback
Pair this with our solar panel sizing calculator and solar ROI calculator for a full storage investment view.
Get Custom Storage CalculatorResult: Storage supports meaningful resilience and bill reduction under these assumptions.
Compare alternative capacities to meet your backup target and payback threshold.
Share it with homeowners, installers, and energy-planning teams
Suggested hashtags: #SolarBattery #EnergyStorage #Solar #Resilience #Calculator