ClueLuma

Control schedule savings calculator

Controls save energy by reducing hours at the controlled input power.

Scontrol=N×Wfixture×(Hold−Hnew)×re1000S_{\text{control}} = \frac{N \times W_{\text{fixture}} \times \left(H_{\text{old}} - H_{\text{new}}\right) \times r_{e}}{1000}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

W
h/yr
h/yr
$/kWh
fixture
$/yr

Worked example

Given

  • WfixtureW_{\text{fixture}} = 50 W
  • HoldH_{\text{old}} = 4,200 h/yr
  • HnewH_{\text{new}} = 2,900 h/yr
  • rer_{e} = 0.12 $/kWh
  • NN = 150 fixture
Scontrol=150×50×(4200−2900)×0.121000=1,170S_{\text{control}} = \frac{150 \times 50 \times \left(4200 - 2900\right) \times 0.12}{1000} = 1{,}170

Symbols and units

SymbolMeaningUnit
ScontrolS_{\text{control}}annual energy-charge savings$/yr
WfixtureW_{\text{fixture}}complete-fixture inputW
HoldH_{\text{old}}old operating hoursh/yr
HnewH_{\text{new}}new operating hours including delayh/yr
rer_{e}electric rate$/kWh
NNcontrolled fixturesfixture

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Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.