Methodology

Every number on this site comes from one data file per product and one shared set of formulas. Writers never type numbers into articles by hand.

Runtime

Runtime in hours = rated capacity (Wh) × efficiency ÷ average load (W).

• AC efficiency is 85% unless the maker publishes a better figure. It covers inverter losses.
• 12V DC efficiency is 90% unless the maker publishes a better figure.
• For appliances that cycle, like fridges, the average load is the daily energy use (Wh per day) ÷ 24.
• When we have measured a combination ourselves, the measured result replaces the calculation and the table says "measured".

Will it run?

On AC power, the appliance's running draw (or average draw when no running figure is published) must be within the inverter's continuous rating, and its startup draw must be within the surge rating. On 12V DC, the current (running or average watts ÷ 12 V), including the startup current, must be within the car port's amp limit.

If a maker does not publish the startup draw, we cannot check the surge. The result then reads "Yes (surge unverified)" instead of a plain yes, and the table lists the reason "Startup surge not specified".

Solar recharge

Hours of full sun = rated capacity ÷ (panel watts, capped at the station's solar input limit, × 75%). The 75% factor covers panel angle, heat and conversion losses. Days = hours of full sun ÷ peak sun hours per day for your location.

Rounding

We round only for display: to 0.1 hours below 2 hours, and to the nearest half hour above that. Calculations always use the unrounded values.

Labels

• rated spec: the manufacturer's published figure.
• calculated: the formulas above, applied to rated specs.
• measured: our own test, with the conditions listed under the table.