Power Station Calculators
The three questions readers ask most — how many nights, will it start, and how long to refill from the sun — answered for your own numbers rather than a generic example.
All three run the arithmetic published on how we research: the 0.85 inverter factor applied once, on the capacity side; the 0.65 solar field factor; surge and solar-input ratings taken from manufacturer specs; nothing measured on a bench, because we don't claim to have one.
CPAP Runtime Calculator
Nights per charge for your CPAP on any station we track.
Enter machine wattage, humidifier setting, and sleep length. Usable capacity is rated Wh × 0.85 for the inverter; 12V DC input skips that loss. Nights round down to the half-night.
Open the cpap runtime calculatorRead the method: Best power stations for CPAP · The runtime comparison table · 12V DC vs the AC inverter
Appliance Surge Sizer
Which stations clear the startup surge of a refrigerator, chest freezer, sump pump, window AC, or saw.
Pick an appliance for a published typical surge range, or enter the compressor LRA from the nameplate (LRA × 120V). Every station is checked against its manufacturer surge and output ratings.
Open the appliance surge sizerRead the method: Surge watts vs running watts · Port wattage limits
Solar Recharge Time Calculator
Hours of peak sun to refill a station from a given panel, and whether a day’s harvest covers your daily use.
Panel output is rated watts × 0.65, the published field factor; the station’s max solar input clips anything above it. Hours to full = rated Wh ÷ effective input, before the controller’s taper near full.
Open the solar recharge time calculatorRead the method: How many solar panels do I need? · STC rating vs real output · Why solar charges slower than advertised
Missing a calculator you'd use — “what will 1000W run,” or a 12V fridge runtime? Tell us on the contact page. The next one gets built from the most-asked question.