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Dealer Name  


Project Name or Project No  

Date the bid is due  

Project Address or Location  

Is this project completed?   

If not, estimated date of completion   

Total No. of solar panels?   

What is the Name, model number and dimensions of solar panel?   

How are they grouped? Landscape or Portrait? How many in a row? 

Fixed or single or dual Tracking?  

Ground mount or rooftop?What is the roof pitch? 

Email PDF drawing. Include the distances; column heights, row widths, road widths, distances between rows. 

What is the mounting angle of the panels (roof plus rack for total angle)? 

Are the solar panels butted tightly together or is there spacing between top and bottom and side to side? What is the distance between rows? 

side to side? What is the distance between rows? 

Show the water connect point on the map PDF. Is it ground or on roof? 

Distance of this water connection point to the solar panels? 

What is the typography like? Is the array on flat ground or roof? If not, what are the Elevation changes from one end of the field to the other. 

Elevation changes from one end of the field to the other. 

What size is the water supply pipe? 2 inch 1 inch ¾ inch ½ inch other specify 

What is the water pressure In Pounds per square inch? 

What is the Water volume in Gallons Per Minute 

Is there a specific location you want the controller and soap tank(s) placed? Show location on PDF drawing (not autocad)_Note: large commercial arrays may require several equipment pads. Is there a GFCI (Ground Fault Circuit Interrupter) at the requested equipment pad location? If not, it needs to be added for controller  

If outside the U.S., what is your current voltage and Hz in the job area? 

What is the configuration of the array? Are all of the panels in one rectangular or square array or are they spread out in several locations (show distances on the map)? 

Are there additional aesthetic concerns? Is this a ground mount array in a field area somewhere remote, or is this on top of an office building? 

What is the direction of the prevailing wind at this location? From which direction 

What is the height of the array from ground or roof to the top of the highest panel? 

What is the distance between one row of panels and the next row? 

Is there hard water? If so, water treatment will need to be added. What is the hardness of the water at the site of this array? (See page two) 

If this is an existing field or array, please send pictures.  

Show top and bottom close-ups of the racking so we can determine mounting options. 

Water Hardness information

Speaking with “experts” there is a wide variety of opinion on what constitutes “hard water.” Because it is the precise mixture of minerals dissolved in the water, together with the water's pH and temperature, that determines the behavior of the hardness, a single-number scale does not adequately describe hardness. Descriptions of hardness correspond roughly with ranges of mineral concentrations. Wikipedia defines degrees of hardness as follows:

Soft: 0-60 mg/L
Moderately hard: 61-120 mg/L
Hard: 121-180 mg/L
Very hard: >181 mg/L

* Note that mg/L and PPM are roughly equivalent. Example 100 mg/L = 100.1142303 PPM

* A French degree (°fH or °f) is defined as 10 mg/L CaCO3, equivalent to 10 ppm.(A GRAIN = 17.1 ppm or 17.1 mg/L)

The laboratory that we use for water samples suggests “Normal Water” is 70 PPM or less and that at 100 PPM you would probably start to see spotting. Below 70 PPM you would not need a softener. Our normal filters and use of our soap concentrate further assist in reducing spotting so one may wish to not install a softener until a level of 100 PPM appear. As noted in our meeting, we recommend washing during the hours of darkness also. Note that Pool dealers suggest that water above 200 PPM needs to be treated for hard water to avoid spotting.

1. Calcium and Magnesium are important and standard testing addresses both in the hardness readings.

We also like to provide input to designers of solar panel layouts if certain conditions exist. For ground arrays for example, we want to make sure that no irrigation systems will spray water onto the panels. Unfiltered irrigation water sprayed onto solar panels over time may create calcium spotting and reduce output or destroy a solar panel through “hot spotting.” Water flow onto panels must be properly directed in the design to avoid creating hotspots.

For our projects we normally send a water sample to a lab and request a complete metals analysis of the sample. A report is then sent to us. This report aids in determining the correct filtration needed at a site.

Info From Water Analysis Lab We Use

Hardness of water is the combination of both Calcium and Magnesium together.

* Note: Because water is potable does NOT mean that it is soft water. Hard water is normally fine for human consumption but not good for spraying on solar panels, cars, windows etc.

Water Hardness Scale
Grains Per Gallon Milligrams Per Liter (mg/L)or Parts Per Million (ppm) Classification
less than 1.0 less than 17.1 Soft
1.0 - 3.5 17.1 - 60 Slightly Hard
3.5 - 7.0 60 - 120 Moderately Hard
7.0 - 10.5 120 - 180 Hard
over 10.5 over 180 Very Hard

1 ppm = 1 mg/L CaCO3
1 ppm = 0.058 grains/US gallon
1 ppm = 0.07 Clark degrees
1 ppm = 0.10 French degrees
1 ppm = 0.056 German degrees
1 French degree = 1 hydrotimetric degree
1 Clark degree = 1 grain / Imperial gallon as calcium carbonate
1 French degree = 1 part / 100,000 calcium carbonate
1 German degree = 1 part / 100,000 calcium oxide
1 grain/US gallon = 17.1 ppm
1 grain/US gallon = 1.20 Clark degrees
1 grain/US gallon = 1.71 French degrees
1 grain/US gallon = 0.958 German degrees