Transparent, non-saving worksheet
Backup Planning Worksheet
Estimate the stored energy needed for a set of loads. This is a planning starting point—not equipment sizing, a runtime guarantee, or an electrical design.
Planning estimate
Wh = watts × hours ÷ efficiency × (1 + reserve/100)
5,647 Wh500 W × 8 h ÷ 0.85 × (1 + 20/100) = 5,647 Wh
This is the energy-side estimate from the stated inputs. It does not select a battery, inverter, transfer method, conductor, overcurrent device, or installation design.
Checks before using the estimate
Loads vary
Startup surges, cycling appliances, temperature, duty cycle, and behavior can change demand.
Usable capacity differs
Battery chemistry, discharge limits, inverter efficiency, aging, temperature, and manufacturer controls affect usable energy.
Power and energy differ
Watt-hours estimate energy. The inverter and system must also support continuous and surge watts.
Confirm locally
Have a qualified electrician or installer review transfer equipment, service, code, utility, and installation requirements.
No values are transmitted or saved by this worksheet. Do not use it as a guarantee of runtime, savings, system compatibility, code compliance, or emergency performance.