Transparent inputs
The calculators are designed around visible assumptions so users can compare estimates against device labels and manufacturer documents.
Calculator hub
Calculators
Browse the current MVP calculator set for backup power planning. These tools estimate energy needs, runtime, charging time, and outage backup requirements without accounts, databases, or brand endorsements.
Backup Power Calculators
Estimate generator size, portable power station runtime, fridge backup time, solar charging, UPS runtime, CPAP battery backup, RV power, and home outage plans.
Open Backup Power category- Generator Wattage CalculatorEstimate running watts, starting surge, and a practical generator size for selected backup loads.
- Portable Power Station Runtime CalculatorEstimate how long a portable power station can run a load after efficiency losses and reserve.
- Refrigerator Backup Time CalculatorEstimate refrigerator or freezer backup time using battery capacity, duty cycle, and inverter efficiency.
- Solar Panel Charging Time CalculatorEstimate solar charging time from battery size, charge target, panel watts, sun hours, and system efficiency.
- UPS Runtime CalculatorEstimate UPS runtime for routers, computers, NAS devices, and other small electronics.
- CPAP Battery Backup CalculatorEstimate CPAP backup runtime and nights from battery capacity, humidifier use, reserve, and efficiency.
- RV / Camping Power CalculatorEstimate daily campsite energy use, trip battery needs, and optional solar recharge.
- Home Outage Backup PlannerPlan 24, 48, or 72 hour backup needs for critical home loads using battery and generator estimates.
Backup power guides
Use the guide library to answer appliance watts, outage duration, battery runtime, generator, solar, and UPS planning questions before opening a calculator.
Browse all guides- How Many Watts Does a Refrigerator Use?Estimate refrigerator watts, startup surge, and backup runtime for generators, power stations, and outage planning in U.S. homes.
- How Many Watts Does a Freezer Use?Plan freezer backup power with typical running watts, startup surge ranges, runtime examples, and practical outage tips.
- How Many Watts Does a Sump Pump Use?Estimate sump pump running watts, startup surge, and backup power needs for outage planning and storm preparation.
- How Many Watts Does a Well Pump Use?Estimate well pump wattage, motor surge, and backup power needs for generators and home outage planning.
- How Many Watts Does a Furnace Blower Use?Estimate furnace blower watts, startup surge, and backup runtime for gas furnace fans during power outages.
- How Many Watts Does a Window AC Use?Estimate window air conditioner watts, startup surge, and runtime for generators, solar batteries, and outage planning.
- How Many Watts Does a Portable AC Use?Estimate portable air conditioner power use, surge needs, and runtime for generators and portable power stations.
- How Many Watts Does a CPAP Use?Estimate CPAP power use for battery backup planning, including humidifier impact, inverter losses, and overnight runtime.
Estimates only
Results are planning estimates, not guarantees of runtime, safety, compatibility, or performance in a real outage.
MVP scope
This release focuses only on backup power calculators. Other home project categories are not part of the current MVP.