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Sizing Your System

Sizing Your System


How to Size Your Solar Energy System

Now that you have gathered all the necessary information, we can begin to size your solar energy system.

Our calculation formula will show you how to find approximately the size of system you will need to cover 100% of your energy demands.

Simply enter in the information gathered from the first step, and reference our solar zone insolation map below.

blue-one.png Is Solar Right for You?

blue-two.png Determining Your System Type

blue-three.png Sizing Your System

blue-four.png Design Your System

Calculating Solar Energy System Size

Since you have your annual KWh average usage, and your solar hours per day (see map below to reference), you can now formulate the total system size. The formula is as follows:

Array Size (kW) = (Annual kWh usage) / (365 days/year) / (Solar Hours/day) / (0.82 derate factor)

For Example: My annual KWh usage is 12000 KWh (1000 per month) ÷ 365 Days in a year ÷ The property located in Zone 3 (receive 5 sunlight hours each day) ÷ Standard derate factor of 0.82 (real world losses) = Total Array Size of 8.2 kW.

(12,000 kWh/year) / (365 days/year) / (5.00 kWh/day) / (0.82) = 8.02 kW Array

*This calculation is based from average annual sunlight hours. During winter months, the system will likely yield less energy. To be sure that the system will be sized for 100% power during these months, subtract 1 – 1.5 sunlight hours from the zone you used in your calculation (annual average), to account for decreased sunlight during those months. This ensures your system will be properly sized to provide the minimum year-round power for all your energy demand.

Sunlight Hours and Regional Solar Zones


*Sun Hours/Day Zone Map

How Many Sun Hours a Day Do You Get?

Zone 1      6 hours
Zone 2      5.5 hours
Zone 3      5 hours
Zone 4      4.5 hours
Zone 5      4.2 hours
Zone 6      3.5 hours

System Sizing Based on Sun Hours

These hours will affect how much energy your system will be able to generate daily. The hourly figure is based on the average annual insolation. The system sized will provide more power during summer, and less during winter when based from this chart.

System Rating 1kW 2kW 3kW 4kW 5kW 6kW 7kW 8kW 10kW
6.5 Sun Hours 150 300 450 600 750 900


1,200 1,500
6 Sun Hours 140 280 420 560 700 840 980 1,120 1,400
5.5 Sun Hours 130 260 390 520 650 780 910 1,040 1,300
5 Sun Hours 120 240 360 480 600 720 840 960 1.200
4.5 Sun Hours 105 210 315 420 525 630 735 840 1,050
4 Sun Hours 95 190 285 380 475 570 665 760 950
3.5 Sun Hours 80 160 240 320 400 480 560 640  800
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Solaris is a leading online solar energy supply store. Since our inception, we have steadily grown to become one of the most robust solar energy dealers nationwide. We provide a large variety of products, custom designed solar electric systems, and superb technical support throughout your installation. designs, supplies, and delivers complete solar energy systems for homeowners, and installers. We use only the highest rated manufacturers in our design layouts, customized for your specific needs and requirements. We have a commitment to excellence for our valued customers, offering wholesale pricing that ensures a powerful return on your investment, for years to come.

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