Examples
Examples
Try the starting example
- Lights: mode label, power W, hours per day, device count
- LED,2,5,1 Lamp,5,2,1
- Planned days
- 2
- Rated battery energy (Wh)
- 100
- User-selected usable energy share (%)
- 80
- Daily lighting energy (Wh)
- 20
- Trip lighting energy (Wh)
- 40
- Usable battery energy (Wh)
- 80
- Energy shortfall (Wh)
- 0
- Days at entered daily pattern
- 4
Try another scenario
- Lights: mode label, power W, hours per day, device count
- LED,2,5,1 Lamp,5,2,1
- Planned days
- 5
- Rated battery energy (Wh)
- 100
- User-selected usable energy share (%)
- 80
- Daily lighting energy (Wh)
- 20
- Trip lighting energy (Wh)
- 100
- Usable battery energy (Wh)
- 80
- Energy shortfall (Wh)
- 20
- Days at entered daily pattern
- 4
Calculation method
Calculation method
Daily lighting energy (Wh)
Sum power × daily operating hours × device count.
Trip lighting energy (Wh)
Daily energy × trip days.
Usable battery energy (Wh)
Rated energy × selected usable share/100.
Energy shortfall (Wh)
max(0,trip requirement−usable energy).
Days at entered daily pattern
Usable energy / daily energy, or No demand at zero daily use.
Symbols and units
- a
- Lights: mode label, power W, hours per day, device count
- b
- Planned days
- c
- Rated battery energy (Wh)
- d
- User-selected usable energy share (%)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Supplied electrical-energy arithmetic. Usable share must already account for your battery and conversion losses. It does not choose battery operating limits or infer weather and temperature effects.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
OpenStax: arithmetic and geometry ↗
Background reading; this does not imply endorsement or independent review of SumFizz.