Independent inverter and UPS tool
Inverter & UPS Battery Backup, Load and Recharge-Time Planner
Enter actual appliance loads and battery details to estimate backup and recharge time without hidden capacity assumptions.
Step 2
Planning estimate
Add loads and battery details to see the estimate.
Estimated backup at —
—Planning estimate, not a runtime guarantee.- Total appliance load
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- Estimated recharge time
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- Battery-side power
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- Estimated battery current
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- Nominal battery energy
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- Planned usable energy
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- Peukert capacity reduction
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- Discharge to recharge
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Limits for this estimate
How the calculation works
Actual load is watts × quantity. Battery-side power includes inverter efficiency. Usable energy uses voltage × Ah × entered discharge depth. Lead-acid runtime applies entered Peukert inputs. Recharge time uses discharged Ah, charger current, efficiency and final-stage allowance.
Important limits
This planner does not check inverter VA rating, starting surge, compatibility, cable size or protective devices. Confirm those separately.