Solar Panels Direct
How much solar paneling will this require? Energy experts needed!?
Hello, I’m looking into solar lighting around the house for various fun projects. I actually know next to nothing (sadly) about energy and electricity. How many square footage of solar paneling directed at the sun for how long would power 200 watts and 120 volts (in one light bulb, in this case), for 1 hour? Also, what information can you give me on energy storage methods in relation to solar paneling?
Here are the quick rules of thumb for Solar sunbelt states like California.
1kW per square meter ~ Insolation (Power density in Sunlight)
15% ~ Typical Solar cell effeciency (What the Solar Cell can extract)
5 peak hours per day. (The effective daily duration of that power)
75% ~ Typical battery efficency (How much you can save in a battery)
What this means is during optium sun on a cloudless day (11am to 1pm) the total power in sunlight is about a kW/m^2.
The typical Solar Panel will convet %15 of this to electricity, i.e. ~150 Watts.
And if you integrate the solar output for a whole day it’s about the same as having 5 ‘peak’ hours.
So 1 square meter would produce. 1 kW x %15 x 5 hours = 0.75 kWhrs/day.
And you will lose about %25 of that if you save it in a battery.
200 watts for 1 hour would be 0.2 Kwh.
/ 0.75 = 266 wh needed.
266/750 = 0.354 m^2 or ~ 4 square feet.
GreenerBusiness 20: Broken Solar Panels
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