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Enviromart:Solar Array/ Battery Sizing Worksheets and Load Evaluation Form

Worksheets

 

 

Use these worksheets to determine your solar and battery requirements. We have included an example column and a column for your system. Give us a call if we can be of help.

Solar Array Sizing Worksheet

1.) Locate your site on the Winter and Average yearly insolation map and list the nearest figures.

2.) Take the daily corrected total loads in watt hours from your load calculation sheet.

3.) Divide line 2 by line 1. This is the number of watts we need to generate per hour of full sun.

4.) Find actual power produced by your selected module and enter on line 3 (rated amperage x battery voltage during charging). Example: Using KC60's one module produces 3.5 amps. 13 volts is a common charging voltage for 12 volt systems. Actual power = amperage x charging voltage.

5.) Divide line 3 by line 4. The result is the number of modules required for your system. When rounding this number, remember that sets of 2 modules are needed for a 24 volt system, sets of for for 48, etc.

Example 

Example

Worksheet

Worksheet
 

 Winter

 Yearly Average

 Winter

 Yearly Average
1.)

  2.5

5.0

 ______

______
2.)

 1000

1000

______

______
3.)

 400

200

______

______

 (3.5 x13)

 (3.5 x13)

______

______
4.)

 46

46

______

______
5.)

 8.69

4.3

______

______

You can see from the example that almost twice the number of modules are required in the winter because, in this instance, we have half as much available sunlight. In northerly climates, this is often aggravated by a larger wintertime demand for more lights, etc. For this reason, we often size residential solar power systems (in the interest of cost- effectiveness) to provide 100% of summer or yearly average loads and meet the winter shortfall with a generator. Remote communications are generally sized to winter conditions.

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Battery Sizing Worksheet

1.) Determine total watt hours per day required from your load calculation.

2.) Determine days of storage required. This approximates the greatest number of cloudy days in a row expected (3 to 7 is common for residences,7 to 14 for remote communications and monitoring sites).

3.) Multiply line 1 by line 2.

4.)Determine planned depth of discharge. 80% is the maximum for lead-acid, deep cycle batteries, 50% a common amount for optimum longevity. Divide line 3 by .80 or .50 respectively.

5.)Derate your battery for low temperatures by multiplying line 4 by factors in the table below using lowest expected weekly average temperature.

 Battery Temp. F

Multiplier

Battery temp F

Multiplier

80

1.00

40

1.30

70

1.04

30

1.40

60

1.11 (Example)

20

1.59

50

1.19
    

6.) Find the watt-hour capacity of your selected battery. This is voltage times ampere hour capacity. Example: L-16 deep cycle, 6 volts x 350 amp hours.

7.)Divide line 5 by line 6. The result is the number of batteries required.

8.) Round number of batteries to fit system voltage. Example: A 24 volt system requires sets of 2 when using 12 volt batteries, sets of 4 when using 6 volt batteries and sets of 12 when using 2 volt cells.

 Example

Worksheet
1.)    1000  ______
2.)

 7

______
3.)

 7000

______
4.)

/ .50

=14,000

______
5.)

x 1.11

= 15,540

______
6.)

 2100

______
7.)

7.4

______

 8.)

 8

______

NOTE: The battery bank amperage should normally be at least 5 times the hourly amperage draw of the largest appliance or 5 times the highest hourly amperage output of the battery charger.

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Enviromart Load Evaluation Form

 

 

 

 
  

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