Backup power calculators built for actual decisions.
Use the numbers before you buy. These tools combine your own load assumptions with normalized product specifications, public outage data and current EIA electricity-price data.
Power Station Finder
Filter the source-linked model database by capacity, AC output, solar input, weight and use case.
Power Station Comparison Tool
Put any two tracked models side by side with normalized specs, energy density and a shared runtime load.
Power Station Runtime Matrix
Enter one appliance load and compare estimated runtime across every tracked power station at once.
Power Outage Load Planner
Build an 8-, 24- or 72-hour critical-load energy budget and see how recharge changes storage needs.
State Power Outage Reliability Explorer
Search and sort 2024 EIA state reliability data by outage duration, frequency, restoration time and major-event impact.
Power Station Charging Cost Calculator
Estimate full or partial recharge cost using battery size, state electricity rates, efficiency and monthly cycling.
Battery Cycle Life Calculator
Convert a published battery cycle-life claim into equivalent years at your cycling frequency without confusing cycles with calendar life.
Battery vs Generator Cost Calculator
Compare multi-year battery ownership with generator purchase, fuel and maintenance costs.
Battery Bank Builder
Convert series and parallel battery layouts into bank voltage, Ah, Wh, usable AC energy and runtime.
Home Backup Battery Size Calculator
Turn critical household loads and outage duration into a nameplate battery target.
Battery Runtime Calculator
Estimate runtime from battery watt-hours, load watts and AC conversion efficiency.
Solar Recharge Calculator
Estimate peak-sun-hours and days required to replace battery energy from a solar array.
MPPT Charge Controller Calculator
Estimate controller output current and cold-weather PV string voltage.
Why we build tools
Backup power questions are usually calculation problems disguised as product questions. A refrigerator buyer needs daily watt-hours and compressor-starting headroom. A home-backup buyer needs a critical-load budget. A charging-cost question needs the electricity rate, battery energy and conversion losses separated clearly.
We publish the formulas and assumptions so the result can be checked independently. When a tool uses a planning factor or a derived metric rather than a source-published measurement, we label it.
Use measured inputs when possible
Nameplate watts, manufacturer manuals, plug-in power meters and your actual utility tariff are better inputs than generic averages. State reliability and electricity-price data are useful comparison baselines, but they are not forecasts or personalized utility quotes.
For permanent home electrical work, transfer equipment and high-current battery systems, use qualified installation guidance and applicable electrical codes.