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Solar Calculators

We have put together a small collection of useful calculators to help you design your solar system. Please bear in mind that when estimating solar power production we always err of the side of caution. As a result, our figures and calculations are quite conservative; always better to over-perform than to disappoint.

Click the button to see more (or less).

Solar PV Feed-in-Tariff & Return on Investment Calculator

 

Feed-in tariff calculator provided by Solar Guide. The feed-in tariff pays property owners a set rate for every kWh of electricity generated via renewable technologies that include solar photovoltaic, wind power, micro CHP, anaerobic digestion and hydro. A full tariff breakdown can be found at the Solar Guide feed-in tariff information page.

Battery Bank Size Calculator

Calculates the minimum recommended battery bank size in amp-hours (Ah) based on the power consumption of the system, voltage, target depth of discharge and desired length of backup power required. Enter the daily power consumption in Wh and check the other data (change if necessary).
Power consumption per day:
Wh
Days backup required:
days
  
Maximum depth of discharge:
 %  
Voltage:
 V  
Minimum battery bank size =
Ah
 

Off-Grid Solar Panel Array Size Calculator

Calculates the minimum recommended solar panel / panel array size needed to produce a fixed amount of power. Enter the power demand on your system in watt-hours (Wh) and the minimum size is given for panels mounted flat, at 45-degrees and with the angle optimally adjusted throughout the year.

Power consumption per day: Wh
Adjustable Angle
45-degree
Flat
Summer:
W
W
W
Spring/Autumn:
W
W
W
Winter:
W
W
W
*note that this calculator has been created to produce conservative 'safe' results.

Off-Grid Solar Energy Production Calculator

Calculates the energy output in watt-hours (Wh) pre day of a solar panel or panel array. Enter the solar panel size in watts and data is given for panels where the mounting angle is changed throughout the year, at 45-degrees and also mounted flat.
Size of solar panel / panel array: W
Adjustable Angle
45-degree
Flat
Summer:
Wh / day
Wh / day
Wh / day
Spring/Autumn:
Wh / day
Wh / day
Wh / day
Winter:
Wh / day
Wh / day
Wh / day
Annual average:
Wh / day
Wh / day
Wh / day
*note that this calculator has been created to produce conservative 'safe' results.

Electric Fencing Solar Panel Size Calculator:

Calculates the minimum solar panel size for an electric fence energiser. Enter EITHER the power consumption (in W), the current rating (in mA) OR the stored energy (in J) and hit 'calculate' (do not enter more than one).
Power consumption of the energiser (at 12V):
W
OR
Energiser current rating (at 12V):
mA
 
OR
Stored energy (joules):
 J  
Minimum solar panel size =
W
 
   
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