100KW Solar Farm Investment Time-frame.

There is a 100KW MAXIMUM limit to Claim STC Credits.


  1. Flat & Fixed Tilted Solar Panel Racking is the least efficient at Harvesting Energy.
  2. DAT & SAT Solar Tracking Racking is the BEST at Harvesting Energy.

Change the Panel Watts, Array Racking and Latitude Location for better accuracy of this calculator!

This calculator does not allow for inverter, transition or parasitic losses.

NB: Only the RED cells can be changed, currently set for a 100KW Solar Farm.

 1) Energy HARVESTING ::

Enter Solar Panel Quantity:


 Add additional panels to increase System kWh.
 Select the Solar Panel Power:
 Select Solar Racking/Harvesting Type:

 For accurate calculation, solar modules effected by Shading from trees, buildings or terrain, reduce the hours of Harvesting! 

 Total Daily Energy Harvested:

kWh DC energy Harvested per Day. 


Array Size

 per Hour/peak 

Solar Energy


 per Day/peak 

Solar Energy


 per Week/peak 

Solar Energy


 per Month/peak 

Solar Energy


 per Quarter/peak 

Solar Energy


 per Year/peak 

 Above Fields indicate approx. Energy production, other factors can change these results. 

 2) Small-scale Technology Certificates (STC) ::

 Number of years STC/REC's are Claimed: 

 Max 11 Years from Jan 2020. (set to end in 2030) 

 Click Here to Calculate YOUR System STC Quantity NB: 1x STC = 1x REC credit, and are limited to a maximum 100kWh system.

Now Enter your system STC's: 

 STC Credits. 

  (1 STC = 1 REC)  

 (Default STC's is set to a 100KW Solar system)

 *Renewal Energy Certificate (REC) Price: 

$  per REC.  

  System TOTAL REC's Refund/Credit: $ 

 Calculate the Government STC/REC Price, by setting the above to the current Market price.

 *Approx. REC spot prices fell to $35 in 2019.

 3) Consumption & Feed-in Tarrif ::

Daily Solar Energy Harvested:


 Daily Energy CONSUMPTION:

 kWh per Day.   Change this figure to match your actual energy Consumption ! 



Feed-In-Tarrif or Income Rate:

  $   $

 Excess Energy field MUST be Positive, if not increase Solar Harvesting, and the more Energy Generated reduces the break-even period if Grid connected !

 4) Enter the RETAIL Energy Rate ::

 Enter your current Retail Energy Rate: 

$  per kWh 

 Change the above Price, to your current Energy rates.

 5) Return on investment ::



per Hour



per Day



per Week



per Month



per Year

$ $ $ $ $


 6) Micro Grid - Potential Payback time ::

 Enter TOTAL System Investment Cost: 

$ You can use this field to include the cost of Solar, Wind & Batteries etc.

*Yearly REC: 

$ 1 STC=1 REC at above set rate.  If REC's are self-claimed, a lumpsum is PAID into Your bank account.

 *Yearly Self-Consumption SAVINGS: 

$ If you consume some/all of your Solar Energy, as set above.


$ Only applies if On-Grid and Exporting at the Rate You set above.

*Years to Break-Even: 

 Years  Based on above figures you enter!

 Change any of the above RED Fields to see the Investment Payback Time!



Important: Please note that all amounts and estimates shown above can be set to suit multiple configurations, and are used for symbolic estimation purpose only.  The actual figure depends on lots of issues including quantity of sun (cloud coverage), Fixed panels, Single Axis or Dual Axis tracking, cabling (DC/AC), electrical connections and electronic losses etc.  These amounts and figures should be considered as example only, and under whatever circumstances, we do not make any guarantee, or cannot be held responsible about these estimates, if used as an actual return to investment!


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