How to Calculate How Many Solar Panels & Batteries Needed for a Solar Refrigerator, Solar Freezer & Solar Air Conditioner

March 29, 2016

In this article we will demonstrate how to easily calculate what you need in terms of Solar Panels and Batteries in order to properly operate your EcoSolarCool solar refrigerators, solar freezers and solar air conditioners anywhere in the world.

After reading this blog, you will be able to calculate what size of solar system/ kit required.

The critical information needed to determine the Power Consumption of your DC fridge, freezer or solar air conditioner unit is the Average Solar Hours (or peak sun hours) of the city & country the unit will be used in.

Our product pages show the Power Consumption of each model, so that information is already available for you.

For US and Canadian customers, the Solar Hours, is available by please log onto the NREL website using the link below:

http://pvwatts.nrel.gov

On the top left hand corner of this page (next to “Get Started:”), please type in your zip code (US addresses) or postal code (Canadian addresses) and then click the “Go” button. On the following page, please click on the “Results” button, which is located on the top of this page. The next page will display a set of results. Please look in the table under Solar Radiation (kWh / m2 / day). This information shows the average monthly solar hours for this address. Please select a figure that is the smallest figure of the year. The number you selected will be used as the Average Monthly Solar Hours to be used in the calculations.

For addresses outside of US and Canada, you will need to use the following link:

http://solarelectricityhandbook.com/solar-irradiance.html

In this Webpage, you should select the Country and Town/City the unit will be installed in, and then select the appropriate Solar Panel direction that you plan to install your solar panels. If you don’t know this, you can use an estimate of ‘Facing directly North’ or ‘Facing directly South’ in the third field.

Now you’re presented with the Average Solar Insolation Figures for each month of the year, and here comes a very important step: you need to select a figure that is the smallest figure of the year. The number you selected will be used as the Average Monthly Solar Hours to be used in the calculations.

After using either of the above websites to determine the Average Monthly Solar Hours, please proceed below:

 

For EcoSolarCool Solar Upright Refrigerators and Solar Chest Refrigerator/ Freezers calculations, use the following equation:

 

 Power Consumption  x  1000

--------------------------------------         =          Solar Panel Size (in Watts)

             Peak Sun Hours

NB: The power consumption figure used in the above equation should be in kWh/day (DO NOT USE Wh/ day figures in the above calculation)

That is to say, multiply the Power Consumption by 1,000 and then divide it by the Average Solar Hours determined from the Nrel or Solar Electricity Handbook websites. Round up the result to the nearest 50 integer, and you’ll have the Solar Panels size in Watts needed to operate your Solar Refrigerator or Solar Freezer.

For Solar Air Conditioners, the formula is very similar but we multiply the numerator by 1.15 in order to make sure that the unit will be properly powered:

 

 

 Power Consumption  x  1000  x  1.15 

----------------------------------------------         =          Solar Panel Size (in Watts)

                   Peak Sun Hours

NB: The power consumption figure used in the above equation should be in kWh/ day  (DO NOT USE Wh/ day figures in the above calculation)

Again, round up to the nearest 50 integer and you’ll have the Solar Panel size in Watts needed to operate your Solar Air Conditioner.

Now, it is time to calculate the Battery System needed. Batteries are measured in Amps Hours (Ah) and Volts. For Solar Refrigerators ESCR115N, ESCR175N and ESCR200, we always recommend using 2 units 100Ah 12V battery system.

For Solar Chest Freezers and Solar Air Conditioners we will use the following equation:

 

Power Consumption  x  2000

--------------------------------------         =          Amp hours 12V Battery

                         12

NB: The power consumption figure used in the above equation should be in kWh/ day

The resulting figure will be the number of deep cycle battery (AGM, Marine, Gel, Lithium) needed to properly operate your EcoSolarCool unit!

 

If you have any questions, please don’t hesitate on contacting us and we’ll be more than happy to further assist you.




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