Green Collar Careers - Solar Site Survey
Site Survey Worksheet captures the data
relevant to the site and calculates basic performance specifications.
Both demand data and supply data is entered with several data points
defined through the use of proven formulas and macros. Only the
white colored cells are to be filled in. All Gray color cells
will use a formula or macro to fill them in. Most of the data
should be filled in prior to a site survey is done however some of
the customer data such as utility information may not be available
until the site visit. The important part is to have the
latitude, longitude and related data to generate the preliminary
Site Survey Data
- Customer Data
- Utility Data
- Home Data
- Available Thermal Energy
- Water Heat System Requirements
- Solar PV Requirements
- Wind Turbine Requirements
Regional Solar Data
- Latitude and Longitude for most major cities in America -
needed for Site Survey Data
- Annual Sunny Days - needed for Site Survey Data
- Will be used to calculate solar azimuth and elevation for
summer, fall, winter, spring milestone dates. Latitude and
Longitude will first need to be entered on the Site Survey
- Input the time values in (Year, Month, Day, Time, GMT, 0 for
DST) in for each season, hit enter and manually record the azimuth
and elevation for each season - this will automatically carry over
to other worksheets.
- Calculates the effective length of day
- Input the time values for each season, hit enter, and record
data. Again, the recorded data is carried to other
Survey Tool Tutorial
This tutorial will focus
on Solar Hot Water systems. Solar electric systems inputs will
be identified in the 500 Module.
1) Open the
Survey Tool and save it to a new folder you've created.
You can manage your own filing system, but I would recommend naming
the folder "Solar Thermal Surveys" and giving the file a name of
"YYYYMMDD-YourName-1".xls. This will position the file by
chronological order with the customer's name for future reference.
The "-1" is in case you want to revise the form yet keep the original.
Note: Fill in ONLY THE WHITE CELLS! All gray cells are filled in
by formulas or macros
2) Select the Site Survey Data
tab and complete the Customer Data in rows 2-13.
the Utility Data in rows 15, 16, 17, & 19.
4) Complete the
Home Data in rows 23-25.
5) From the Google Map determine which
section of your roof has the southernmost exposure. Go out and
take a look at it and estimate the number of feet in the X direction,
and the number of feet in the Y direction, and add that to the sketch.
Take a compass and measure the angle to the nearest degree of the wall
that lines up with the roofline, and show that on the sketch.
Note where due north/south is by the compass in relation to the roof
surface. At this point you won't need to be exact but a good
scale sketch is a good sign of true professional interest!
Measure the pitch of the roof as best you can; Access it from
the attic take protractor and measure the angle of the roof slope.
If you don't have a protractor use a level and tape, measure the the
horizontal distance and the vertical distance, then using
Pythagorean's theorem calculate the angle. While you're in the
attic look for the routes you'll be running the fluid transfer lines
between the collectors and storage tank.
7) Walk around your
lot and site off the path of the sun through the day - are there any
sun obstructions like trees or other objects that will create shadows
on the roof surface? Remember that the sun will be higher in the
summer months and lower in the wither months. Label these
obstructions on the sketch.
- If there are no obstructions and the roof surface is aligned
within 25° of south facing, it will be a suitable surface to mount
collectors. Collectors do not need to be mounted flush on the
roof, in fact despite what you may see in pictures that is actually
bad practice. Collectors/Panels should always be elevated
slightly above the roof tiles to give some access to roof tiles.
- If there are obstructions the choices are simple; either
remove the obstruction, change the mounting location, or de-rate the
system to operate only within the window of available sunlight.
7) Fill in 26, 27, 28 of the Home Data with measurements
and notes you've taken. By this time you should have a pretty
good idea of where the system will mount.
8) If you don't know the
longitude and latitude of the subject home Google Maps will have it,
or it can be found on the Regional Solar Data tab. You
don't need it down to the minutes and seconds. Under the
Available Thermal Energy section fill in rows 35 and 37.
The data in these two rows will automatically populate a few other
cells we'll visit later.
9) Select the Regional Solar Data
tab and look up the city (or closest city) where you're doing the
survey. Look up the "Sunny Days a Year" value on the Site
Survey Data worksheet row 38.
10) Select the solar_position
tab and look at the Input Column a moment. Latitude and
Longitude values came from the inputs at step #8. Over on the
right side under columns 3, 4, 5, &6 you'll see a box with a heading
"Use these Settings". Under Summer '6' is listed for the
month, '21' is listed for the day and so on. Key those numbers
in for the corresponding cell and hit enter, which updates the
azimuth and elevation values. For each season record those
values in the boxes under where it says "Record the Values".
Those values will populate the Site Survey Sheet.
Tip: Output values on the solar_position and sunrise
worksheets may not be "cut & paste" in the normal way as they are
the result of a macro. You can right click for "Paste Special
", click the Value radio button, and paste the value.
Select the sunrise tab and once again run through the
exercise to record the data for each of the seasons.
the Site Survey Data tab and notice that the remaining
Available Thermal Energy cells have been filled in. Doing
all that manually the first time would have probably taken several
days if you already had the formulas. Weeks if you had to find
the formulas. Minutes using the worksheets provided.
most part that is the site survey. We may appear to have
gotten a little bit ahead of ourselves as we reviewed the Water
Heat System Requirements in the previous chapter. As you
recall we actually reviewed a completed sample. Now lets
complete this survey.
Check the water heater temperature and input
that value to Temperature on row 57.
Input the value for
Solar Collector Efficiency % - for the purposes of this tutorial we'll
Finally input the Solar Water Heating Percentage, and save