12V DC Freezer
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(Kind of how much fuel they can hold). This is figured by dividing the total battery capacity required (from step 4) by your system battery voltage, usually 12, 24, or 48 volts. Simply stated, the higher battery voltage you use, the smaller (and therefore cheaper) size copper wire can be used to connect the solar panels to the batteries.
NOTE: The number of Solar Panels required is based on a typical 90 watt panel. The batteries are assumed to be standard 12 volt @ 105 amphours. Detailed Instructions for the System Sizing Estimator. Step 1 is to calculate the daily WattHour usage of each item. This is done by multiplying the item wattage by the number of hours used each day.
So, using the Estimator's default selections as an example, you get 3520 daily WattHours divided by 450 = 8 solar panels rounded up to the next panel. See Solar Radiation to find the number of average daily hours of sunshine for your area.
(The Wires and Cables tutorial has a chart for calculating wire sizes.) Here is an example of this calculation: The default values in the Estimator give you a total battery capacity of 21120/12 volts = 1760 AmpHours. Then divide the 1760 AmpHours by the 105 AmpHour rating of a typical 12 volt battery (1760/105 = about 17).
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Calculates the Number of solar panels & batteries needed for a solar energy system.
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