Emergency Power Modeling · Amp-Hour Drawdown
Backup Sump Pump Battery Runtime & Cycle Life Calculator
Calculate real-world storm survival hours and total evacuated water based on battery chemistry, Amp-hour capacity, and pumping duty cycle.
Battery & Emergency Electrical Parameters
The 20-hour nominal capacity rating printed on the battery label.
Lead-acid batteries suffer permanent plate degradation if discharged below 50% Depth of Discharge (DoD).
Typical draw: 8A to 12A for 1,000 GPH pumps; 14A to 18A for 1,700–2,400 GPH high-output DC pumps.
Percentage of each hour the emergency pump is actively running.
Calculated Battery Survival Output
Usable Electrical Capacity
50.0 Ah
Non-Stop Continuous Pumping
3.6 hrs
Real-World Storm Runtime
23.8 hrs (1.0 days)
Estimated 10-Gal Sump Cycles
643
Total Water Evacuated
6,429 gal
Peukert's Law Note: High DC discharge currents (>15A) reduce effective battery capacity below the 20-hour rating. Maintain a multi-stage smart maintainer to prevent chronic plate sulfation.
Compatible Battery Backup Systems
Basement Watchdog BWE 1000 Emergency Battery Backup Sump Pump System
1,000 GPH at 10' head · Dual Micro-Reed Float Switch with Warning Alarm · Corrosion-Proof Thermoplastic
$189
Zoeller ProPak53 Pre-Assembled Primary + 508 Battery Backup Package
1,440 GPH at 10' head · Dual Vertical Float Switches · Cast Iron Primary / Thermoplastic Backup
$949