RESILIENCE PLANNER
Turn assumptions into a scenario.
Estimate critical-load energy and indicative battery capacity. All calculations run in your browser; no inputs are sent to us.
YOUR SCENARIO
2,000 kWh
Energy required at the load
- Usable energy delivered
- 2,160 kWh
- Indicative runtime
- 4.32 hours
- Minimum nominal battery energy
- 2,777.78 kWh
- Energy shortfall at load
- 0 kWh
Energy requirement covered under these assumptions.
Formulas and boundaries
Required energy = critical load × outage hours. Delivered energy = battery capacity × usable fraction × discharge efficiency. Runtime = delivered energy ÷ critical load. Minimum nominal capacity = required energy ÷ (usable fraction × efficiency). Shortfall = max(0, required energy − delivered energy).
The usable fraction is the capacity available at the start of the event, accounting for state of charge and reserve policy. Efficiency is applied once to discharge. This simplified calculation excludes ageing, temperature, auxiliary loads, charging, variable demand, renewable output and battery power limits. It is not a protection study, engineering design or guaranteed backup duration. No cost or savings estimate is implied.