How to design a typical home solar system?
Reference:

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Total Watts Per Hour (DC Amps x 12):
The real power drawn by the equipment is expressed in Watts or VoltAmps (VA). Add the total Watts of your appliancies and write the total in the space provided in the table. This field needs to be DC watt draw only. If you are using an inverter, meaning your device is rated in AC amps and 110 V, you will need to convert that number into DC watts before entering it in the field. Then you will need to add about 10% due to the inefficiency of the inverter. To get there, use the following formulas; 1 Amp AC = 10 Amps DC. (example, 2AC amps =20DC amp) Add 10% (22 amps) DC amps x 12v = DC watts. (22 x12 =264 watts) 264 would be entered in field  
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Hours Equipment is expected to run as per application:
for how many hours you expect your equipment to run in a 24 hour period, and your input voltage (12, 24, 36?). 
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Total daily usage is Watts x Hours:

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Total watts required per day:

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Assumes static average loss:

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System DC voltage only:

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Amphours per days is Watts divided by Volts:

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Days backup power required (Average 24 hour periods):
determine what size and how many batteries you need.  
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Amphour storage. Raw capacity you need:

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Depth of discharge. Assumes 50%:

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Required amp backup. Prevents excessive discharge:

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Battery Amp/Hr Rating:
determine what size and how many batteries you need.  
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Actual # batteries wired in parallel. Raw number:

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Batteries wired in series relates to system voltage:

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Rounded up number of Batteries:

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Sun hours per day (Direct only):

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Worstweather multiplier * (1.55 default):

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Total average sun hours per day:

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Solar panel size (Watt hour rating):

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Nominal Panel Solar output Voltage:

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Daily Amps consumption required from solar panels:

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Peak amperage of solar panel. Watts divided by Volts:

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Number of solar panels in parallel:

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Number of panels in series (12 V) (it is 1 for 12v, 2 for 24v, etc):

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Rounded number of solar panels :

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The Power Factor for a standard home is 0.8 max.

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You should prefer an inverter of 20% or more for the best choice.

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How long will it take before the inverter dies on you.

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recharge factor is the additional energy required to charge a battery , usually it is
about 1.1 to 1.15 . It means it needs 10 to 15 % more energy to make up for what
has been removed from the battery.

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Desired charge time in hours = 8 to 12 hours

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Energy consumed by Constant load.

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Estimated power required to charge the battery.
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