Eric Lee's posts

Posted by Eric Lee on Mar 19, 2011 09:41 am

#1 - Renewable Energy > Technical Discussion: Solar Electric System - Photovoltaic > How many pcs of the 120W solar panel do I need?

Hi,

I have a project that is:
System current: 14A
Operating voltage: 240V
Operating hr: 6hr
Panel operate voltage: 34V
Sunshine duration: 3.4hr

I would like to know the below calculation is correct or not:

Current capacity of the loading per day: 14A X 6Hr = 84AH
Current need to be created in the solar panel:
84AH/3.4hr = 24.7A
Power created in the solar panel = 24.7 X 34 = 840W
Assume 80% efficiency, power in the solar panel required = 840/0.8 = 1050W

No. of 120W solar panel required = 1050/120 = 5 pcs

Wrong or right?

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