Use the method
Practical guides for LoadDay Power Planner
Start with the loads that matter during an outage, then separate their daily energy from their instantaneous startup demand. This keeps a large peak-wattage appliance from hiding an otherwise workable battery plan.
Practical guide
Turn backup device loads into daily energy
Use running watts, hours per day, and priorities to build a transparent outage load scenario.
Read guidePractical guideCompare battery capacity with inverter demand
Apply usable energy and efficiency assumptions, then check continuous and peak inverter inputs separately.
Read guideRead the calculation methodology and reference sources
Method and examples reviewed 2026-09-30. Examples are illustrative; input values and specifications are not independently verified.