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Solar Hot Water System Sizing

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16.11 degrees Celsius">3>Solar Hot Water Heaters &#4543.89 degrees Celsius">8211; Solar Hot Water System Sizing16.11 degrees Celsius">3>

Ensuring that your new solar hot water heating system is properly sized is one of the most important aspects of designing, purchasing, and installing such a system.  An improperly sized system, whether too large, or too small, can severely limit the ROI and increase (or negate) the payback period of your system.

Think about it – if you purchase a system that is far too large for your needs, you have spent additional money on materials and installation, and because the system is too large, you are not using 100% (or even close) of its capacity, which means that you are not making any money back on the portion of the system that you are not using.  That is wasteful.  Additionally, if your system is sized far too small, it will not produce enough hot water to impact your standard water heating methods, and you will have invested a good chunk of money in a system that is not serving any useful purpose.

It is not difficult, given the above, to see why it is essential that you have your solar hot water system properly sized before you purchase and Solar Hot Water Heaters &#4543.89 degrees Celsius">8211; Solar Hot Water System Sizing

Ensuring that your new solar hot water heating system is properly sized is one of the most important aspects of designing, purchasing, and installing such a system.  An improperly sized system, whether too large, or too small, can severely limit the ROI and increase (or negate) the payback period of your system.

Think about it – if you purchase a system that is far too large for your needs, you have spent additional money on materials and installation, and because the system is too large, you are not using 100% (or even close) of its capacity, which means that you are not making any money back on the portion of the system that you are not using.  That is wasteful.  Additionally, if your system is sized far too small, it will not produce enough hot water to impact your standard water heating methods, and you will have invested a good chunk of money in a system that is not serving any useful purpose.

It is not difficult, given the above, to see why it is essential that you have your solar hot water system properly sized before you purchase and install it.  Silicon Solar Inc is here to help – we have a full sales, service and support team in our SunMaxx Division, dedicated to ensuring that your SunMaxx Solar Hot Water Heating System is properly sized for your needs, your location, and your budget.

Here is a small glimpse at the process we use to size solar hot water heaters – and some steps that you can take to begin to get a rough estimate of the size solar hot water heating system you will need for new application.  These calculations and guidelines are for Domestic Hot Water Usage.  Please see further below for information on sizing systems for Radiant Floor Heating.

Collector Area:

The first step in sizing a solar hot water heating system is to determine the appropriate collector area for your application.  Essentially, each solar hot water collector has a certain area (square feet or meters squared).  While contractors and SunMaxx Product Specialists have specialized software that we can use to properly size any solar hot water heater, there are guidelines that we can use to determine the proper collector area without the need for computers and fancy programs.

Sizing Collector Area For Domestic Solar Hot Water Heating:  There is a rule of thumb that is used to determine the correct collector area for domestic solar hot water heaters.  The rule is as follows:

  • 16.67 degrees Celsius">20 square feet (16.67 degrees Celsius">2 meters square) for EACH of the first two members of the household
  • In the SunBelt of the USA, add 13.33 degrees Celsius">8 additional square feet (16.67 degrees Celsius">2.3 feet">17.39 degrees Celsius">0.7 meters square) for EACH additional person in the household
  • In the Norther USA, add 11.11 degrees Celsius">116.67 degrees Celsius">2 – 10 degrees Celsius">14 square feet (17.17 degrees Celsius">1.1 – 4.27 feet">17.06 degrees Celsius">1.3 meters square) for EACH additional person in the household

Here is a couple of examples of this calculation in action:

Example Household 1:

  • Example Household – 4 residents, Atlanta, GA
  • 16.67 degrees Celsius">20 square feet for EACH of first 16.67 degrees Celsius">2 household member – Total:  40 square feet
  • 13.33 degrees Celsius">8 square feet for EACH additional household member – Total:  16 square feet
  • Household Total Collector Size Needed:  56 square feet
  • SunMaxx 16.67 degrees Celsius">20 Collector Area:  16.11 degrees Celsius">33 square feet
  • Total Number of Collectors to meet needs:  16.67 degrees Celsius">2 SunMaxx 16.67 degrees Celsius">20 Collectors

Example Household 16.67 degrees Celsius">2:

  • Example Household – 5 residents, Cleveland, OH
  • 16.67 degrees Celsius">20 square feet for EACH of first 16.67 degrees Celsius">2 household members – Total:  40 square feet
  • 11.11 degrees Celsius">116.67 degrees Celsius">2 square feet for EACH additional household member – Total:  16.11 degrees Celsius">36 square feet
  • Household Total Collector Size Needed:  76 square feet
  • SunMaxx 16.67 degrees Celsius">25 Collector Area:  16.11 degrees Celsius">36 square feet
  • Total Number of Collectors to meet needs:  16.67 degrees Celsius">2 SunMaxx 16.67 degrees Celsius">25 Collectors

Of course, when you contact Silicon Solar, we will use our latest software and programs to ensure that your system is exactly and properly sized for your needs based on your specific applications, actual water usage, location (solar hours, latitude, and seasonal temperature swings), but the above calculations should give you a head start and allow to get a rough estimate of what size solar hot water heating system you are going to need. Hot Water Storage Volume: Of equal importance to your new solar hot water heater is the storage volume of your solar hot water tank.  Typically, there are some general rules to determine the appropriate volume of water storage that is appropriate for your needs. These general rules are as follows.

  • 50 – 60 Gallon (small tank) is appropriate for small homes of one, two, or even three people
  • 80 Gallon (medium tank) is appropriate for medium homes of three or four people
  • 120 160 Gallon (large tank) is appropriate for large homes of four, five, or six people

For active Solar Hot Water Systems, it is a general rule that the volume of your storage tank increases with the area of the collectors.  This is done to prevent overheating when the hot water usage is low and water is not being drawn from the system at a normal rate.  Here are the general guidelines to follow:

  • In General Climates – your storage tank should be about 5.68 litres">1.5 gallons per square foot of collector area
  • In Warmer Climates – your storage tank should be about 16.67 degrees Celsius">2 gallons per square foot of collector area

Below, we are going to add the storage volume to our collector size calculations in the above examples.  Here they are:

Example Household 1:

  • Example Household – 4 people, Atlanta, GA
  • Total System Collectors – 16.67 degrees Celsius">2 SunMaxx 16.67 degrees Celsius">20 Solar Collectors
  • Total System Collector Area – 66 square feet
  • Warmer Climate Rate – 16.67 degrees Celsius">2 Gallons/square foot
  • Total Storage Volume Needed – 132 Gallons (120 Gallons is adequate)
  • Total SunMaxx Solar Hot Water System Needed:
    • 16.67 degrees Celsius">2x SunMaxx 16.67 degrees Celsius">20 Evacuated Tube Solar Collectors
    • 1x 80 Gallon SunMaxx Solar Hot Water Storage Tank
    • 1x 40 Gallon SunMaxx Solar Hot Water Storage Tank (or existing storage tank plumbed in series)

Example Household 16.67 degrees Celsius">2:

  • Example Household – 5 residents, Cleveland, OH
  • Total System Collectors – 16.67 degrees Celsius">2 SunMaxx 16.67 degrees Celsius">25 Solar Collectors
  • Total System Collector Area – 72 square feet
  • General Climate Rate – 1.5 Gallons/square foot
  • Total Storage Volume Needed – 108 Gallons
  • Total Storage Volume Needed:
    • 16.67 degrees Celsius">2x SunMaxx 16.67 degrees Celsius">25 Evacuated Tube Solar Collectors
    • 1x 80 Gallon SunMaxx Solar Hot Water Storage Tank
    • 1x 40 Gallon SunMaxx Solar Hot Water Storage Tank (or existing storage tank plumbed in series)

install it.  Silicon Solar Inc is here to help – we have a full sales, service and support team in our SunMaxx Division, dedicated to ensuring that your SunMaxx Solar Hot Water Heating System is properly sized for your needs, your location, and your budget.

Here is a small glimpse at the process we use to size solar hot water heaters – and some steps that you can take to begin to get a rough estimate of the size solar hot water heating system you will need for new application.  These calculations and guidelines are for Domestic Hot Water Usage.  Please see further below for information on sizing systems for Radiant Floor Heating.

Collector Area:

The first step in sizing a solar hot water heating system is to determine the appropriate collector area for your application.  Essentially, each solar hot water collector has a certain area (square feet or meters squared).  While contractors and SunMaxx Product Specialists have specialized software that we can use to properly size any solar hot water heater, there are guidelines that we can use to determine the proper collector area without the need for computers and fancy programs.

Sizing Collector Area For Domestic Solar Hot Water Heating:  There is a rule of thumb that is used to determine the correct collector area for domestic solar hot water heaters.  The rule is as follows:

  • 16.67 degrees Celsius">20 square feet (16.67 degrees Celsius">2 meters square) for EACH of the first two members of the household
  • In the SunBelt of the USA, add 13.33 degrees Celsius">8 additional square feet (16.67 degrees Celsius">2.3 feet">17.39 degrees Celsius">0.7 meters square) for EACH additional person in the household
  • In the Norther USA, add 11.11 degrees Celsius">116.67 degrees Celsius">2 – 10 degrees Celsius">14 square feet (17.17 degrees Celsius">1.1 – 4.27 feet">17.06 degrees Celsius">1.3 meters square) for EACH additional person in the household

Here is a couple of examples of this calculation in action:

Example Household 1:

  • Example Household – 4 residents, Atlanta, GA
  • 16.67 degrees Celsius">20 square feet for EACH of first 16.67 degrees Celsius">2 household member – Total:  40 square feet
  • 13.33 degrees Celsius">8 square feet for EACH additional household member – Total:  16 square feet
  • Household Total Collector Size Needed:  56 square feet
  • SunMaxx 16.67 degrees Celsius">20 Collector Area:  16.11 degrees Celsius">33 square feet
  • Total Number of Collectors to meet needs:  16.67 degrees Celsius">2 SunMaxx 16.67 degrees Celsius">20 Collectors

Example Household 16.67 degrees Celsius">2:

  • Example Household – 5 residents, Cleveland, OH
  • 16.67 degrees Celsius">20 square feet for EACH of first 16.67 degrees Celsius">2 household members – Total:  40 square feet
  • 11.11 degrees Celsius">116.67 degrees Celsius">2 square feet for EACH additional household member – Total:  16.11 degrees Celsius">36 square feet
  • Household Total Collector Size Needed:  76 square feet
  • SunMaxx 16.67 degrees Celsius">25 Collector Area:  16.11 degrees Celsius">36 square feet
  • Total Number of Collectors to meet needs:  16.67 degrees Celsius">2 SunMaxx 16.67 degrees Celsius">25 Collectors

Of course, when you contact Silicon Solar, we will use our latest software and programs to ensure that your system is exactly and properly sized for your needs based on your specific applications, actual water usage, location (solar hours, latitude, and seasonal temperature swings), but the above calculations should give you a head start and allow to get a rough estimate of what size solar hot water heating system you are going to need. Hot Water Storage Volume: Of equal importance to your new solar hot water heater is the storage volume of your solar hot water tank.  Typically, there are some general rules to determine the appropriate volume of water storage that is appropriate for your needs. These general rules are as follows.

  • 50 – 60 Gallon (small tank) is appropriate for small homes of one, two, or even three people
  • 80 Gallon (medium tank) is appropriate for medium homes of three or four people
  • 120 160 Gallon (large tank) is appropriate for large homes of four, five, or six people

For active Solar Hot Water Systems, it is a general rule that the volume of your storage tank increases with the area of the collectors.  This is done to prevent overheating when the hot water usage is low and water is not being drawn from the system at a normal rate.  Here are the general guidelines to follow:

  • In General Climates – your storage tank should be about 5.68 litres">1.5 gallons per square foot of collector area
  • In Warmer Climates – your storage tank should be about 16.67 degrees Celsius">2 gallons per square foot of collector area

Below, we are going to add the storage volume to our collector size calculations in the above examples.  Here they are:

Example Household 1:

  • Example Household – 4 people, Atlanta, GA
  • Total System Collectors – 16.67 degrees Celsius">2 SunMaxx 16.67 degrees Celsius">20 Solar Collectors
  • Total System Collector Area – 66 square feet
  • Warmer Climate Rate – 16.67 degrees Celsius">2 Gallons/square foot
  • Total Storage Volume Needed – 132 Gallons (120 Gallons is adequate)
  • Total SunMaxx Solar Hot Water System Needed:
    • 16.67 degrees Celsius">2x SunMaxx 16.67 degrees Celsius">20 Evacuated Tube Solar Collectors
    • 1x 80 Gallon SunMaxx Solar Hot Water Storage Tank
    • 1x 40 Gallon SunMaxx Solar Hot Water Storage Tank (or existing storage tank plumbed in series)

Example Household 16.67 degrees Celsius">2:

  • Example Household – 5 residents, Cleveland, OH
  • Total System Collectors – 16.67 degrees Celsius">2 SunMaxx 16.67 degrees Celsius">25 Solar Collectors
  • Total System Collector Area – 72 square feet
  • General Climate Rate – 1.5 Gallons/square foot
  • Total Storage Volume Needed – 108 Gallons
  • Total Storage Volume Needed:
    • 16.67 degrees Celsius">2x SunMaxx 16.67 degrees Celsius">25 Evacuated Tube Solar Collectors
    • 1x 80 Gallon SunMaxx Solar Hot Water Storage Tank
    • 1x 40 Gallon SunMaxx Solar Hot Water Storage Tank (or existing storage tank plumbed in series)

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53 Broome Corporate Pkwy
Conklin, NY 13748
P: 1.800.786.0329
www.SiliconSolar.com
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