Home energy guides
Watts vs. Watt-Hours
Learn the difference between power and energy and avoid a common battery-sizing mistake.
How to Read an Appliance Power Label
Find voltage, current, watts, and duty-cycle clues on an appliance label.
Battery Usable Capacity and Depth of Discharge
Understand why nominal battery capacity is not all available for routine use.
Why Inverter Efficiency Changes Runtime
See how conversion loss and inverter standby draw reduce AC runtime.
How to Find Your Electricity Rate
Use your utility bill to choose a meaningful price per kilowatt-hour.
Why Real Battery Runtime Differs from the Formula
Learn how load, temperature, age, cutoffs, and wiring affect measured runtime.