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## How to Calculate How Many Solar Power Panels .pdf

Original filename: How to Calculate How Many Solar Power Panels.pdf
Title: Microsoft Word - How to Calculate How Many Solar Power Panels.doc
Author: Robert

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### Document preview

How to Calculate How Many Solar Power Panels
Are needed to power my Whole House entirely off solar.
Solar power is the way to the future in energy development. Completely renewable,
sustainable and fairly reliable, solar energy is becoming more of a reasonable energy
source and less of a craze. If you are thinking of getting in on this sustainable resource for
energy, you first will have to do some significant planning. You need to know exactly
how much equipment you will need to buy to maintain your current state of living, and
that has to do with calculating the number of solar panels you will require. There are
numerous calculators available on the Internet regarding solar panel calculations;
however, you can follow these simple steps to calculate by hand today.
Difficulty:

Moderately Easy

Instructions
Things You'll Need
• Pencil
• Paper
• Calculator
1.) Determine the number of kilowatt hours or kWh your household uses on a typical day.
This can be done by examining your electric bill and dividing your monthly kWh
measured by the number of days in the billing cycle.
Note: For a more accurate estimate, look at your year-end kWh usage and divide by 365.
2.) Calculate the amount of energy that can be stored in your battery bank. Determine the
size of battery bank required with this formula: (total load in watts X days of backup
storage) / (system voltage X efficiency after system losses).
As an example, the average household uses 29 kWh per day, and let's say you want two
days of backup storage with 24-volt batteries: (29,000 X 2) / (24 X 0.80) = 3,020.83 amp
hours at 24 volts. Most 24-volt batteries will sustain around 5 amp hours, and since you
will also be charging your system constantly with the solar panels, you can assume that
there will only be a 5 percent draw on your batteries.
Thus, 3,020.83 / 5 = 604 X .05 = 30.2 or a bank of 31 24-volt batteries.
3.) Calculate the number of solar panels needed for your battery bank. Divide the total
amp hours per day (3,020 in our example) by the average sun hours per day (based on the
solar isolation chart, 4.2 in our example) to get the total array amps needed. Determine
the peak amps produced by the solar module you are looking at purchasing (divide the
module's wattage by the peak power point voltage, 17 in our example). Divide the total
array amps by the peak mps and round to the highest whole number (43 in our example).
This gives you the total solar panels needed for your home application based on your
energy requirements and the solar panels you are looking at purchasing.

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