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 or standby generator size from essential home loads, running watts, startup surge, well pumps, sump pumps, refrigerators, freezers, AC, and safety margin.
Open calculator → Power & BackupCamping & RV Generator
Estimate RV and camping generator size from air-conditioner startup surge, appliance wattage, outdoor loads, safety margin, and what will run at the same time.
Open calculator → Power & BackupPower Station Runtime
Estimate portable power station runtime from watt-hours, selected device loads, inverter losses, usable battery capacity, and common appliance examples.
Open calculator → Power & BackupBattery Runtime
Estimate 12V battery runtime from watt-hours, amp-hours, voltage, load watts, usable capacity, inverter loss, and realistic continuous-use assumptions.
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.
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