Methodology
Every watt-hour names its boundary.
The planner uses entered load, runtime, reserve, conversion efficiency, and usable battery share to produce a capacity baseline. Product runtime is then verified against the chosen equipment, installed load, and measured event path.
Energy
Watts × hours, plus shutdown reserve
The model adds operating energy and the energy reserved for the chosen controlled-shutdown window.
Battery
Delivered Wh ÷ usable conversion share
Nominal battery Wh is derived from the selected conversion efficiency and usable battery share, not from a product runtime label.
Output
25% continuous-watt planning headroom
This is a capacity buffer for comparison. Startup behavior, power factor, output waveform, and compatibility still need exact-equipment verification.
Proof
Measure a real power event
Test runtime and, where storage is involved, the actual controlled-shutdown path before relying on the reserve.
Editorial record
Maintained by Make Your Own Tools to turn “Keep critical home tech running” into a defined continuous watts, battery wh, shutdown reserve, and the next proof check. The references below provide the technical context for this planning path. Its calculation rules and planning assumptions are documented in the methodology, and affected calculations pass regression checks before the review date advances.
- Last reviewed
- Evidence set
- 2 primary references
- Calculation coverage
- 3 affected rules checked
- Planning scope
- Home continuity-load, runtime, battery-energy, and shutdown-reserve planning.
- Next check
- Electrical installation, wiring, grounding, medical loads, exact equipment compatibility, battery health, surge behavior, or product-specific runtime claims.