Brochures
Brochures
Brochures
Brochures
Untitled Document
 

Panoptics LED Payback Calculator

This calculator gives payback time, the annual and life-time energy AND maintenance savings when you upgrade your lighting to LEDs.  Enter the wattage and life for both the old and new fixture and the billing rate per kilowatt-hour.  Be sure to include all costs, i.e. labor, parts, inventory, etc.

Start with Tab key, fill in the shaded cells and/or step forward with Tab key.  (Shift Tab to step backward.)

1. Calculate the total energy (kilowatts, kW) saved by replacing traditional lighting to LEDs.
Original Fixture
Wattage + Ballast		   LED
Wattage		   Watts Saved
per Fixture		   # of Fixtures
to Replace		    Power
Saved
W -  W =  W × = Label W
Label  kW
2. Calculate the total energy (kilowatt hours, kWh) saved each year.
Total Kilowatts
Saved		 Hours of Use
per Day		 Days of Use
per Week		 Weeks of Use
per Year		 Total kWh
Saved Annually
Label kW × × × = Label
 
3. Calculate the total energy cost savings per year.
Total kWh
Saved per Year		   Your Energy Cost
per kWh (typ. $0.10)		   Energy Cost Savings
per Year
Label kWh/yr × $ = $Label 
 
4. Calculate energy cost savings over the life of the LED.
Replacement
LED Life (hours)		   Hours per Year
Usage		   LED Est. Life   Energy Cost Savings
per Year		   Lifetime Energy
Cost Savings
 Hr  ÷  Label hr/yr  =  Label  Years  ×  $Label  =  $Label
5. Calculate payback from energy cost savings.
NOTE:  "LED cost" is the amount amortized in payback calculations.  It should include installation costs. 
It should be the difference between LED and the fixture it replaces (new installation).  Or, it may be the direct cost (retrofit).
Payback From
Energy Savings		 = LED Cost, or, Difference between LED & Original = $ × Label Units = Label Years
Energy Cost Savings per Year $Label
 
Return on Investment
(ROI)		 Based upon 100% =
repayment in year #1		 = 100 = 100 = Label% 
Simple Payback Label 
 
6. Compute maintenance savings over the life of the LED.   Include labor, equipment, fuel, parts, inventory, etc.
LED
Life (hours)		   Original Fixture
Life (hours)		   # of
Fixtures		   Maintenance Labor
Original Fixture		   Maintenance Parts
Original Fixture		   Lifetime Savings
in Maintenance
Label ÷ × Label × ( $  + $   ) = $Label
7. Compute the amortized changeout cost savings per year.
Total Lifetime Replacement Cost Savings Lifetime of Replacement Fixture Total Amortized
Savings per Year
$Label ÷ Label Years  = $Label
 
Simple Payback on
Energy Consumption
And Maintenance Costs		 =

 Initial Cost of Upgrade =

 Label × # of Fixtures =
 Label Years
Energy + Maintenance
Cost Savings		 Label
 
Return on Investment
(ROI)		 = 100 = 100 =  Label%
Simple Payback  Label

.