Power & Backup
Estimate generator size, battery runtime, portable power station capacity, and other backup-power decisions with guided inputs and plain-English results.
5 calculators
Pick the calculator closest to the decision you are trying to make.
Home Generator Size
Estimate backup generator size for home essentials, standby generator planning, running watts, startup surge, well pumps, sump pumps, refrigerators, and outage loads.
Open calculator → Power & BackupCamping & RV Generator
Estimate generator wattage for RV, camping, cabin, and outdoor power needs.
Open calculator → Power & BackupPower Station Runtime
Estimate how long a portable power station can run common devices.
Open calculator → Power & BackupBattery Runtime
Estimate 12V battery runtime from watt-hours, amp-hours, voltage, device watts, usable capacity, and inverter loss.
Open calculator → Power & BackupExtension Cord Voltage Drop
Estimate extension cord voltage drop from one-way cord length, amps, voltage, and AWG wire gauge for tools, chargers, generators, pumps, and temporary power.
Open calculator →