Solar Panel Ac Output
How much energy does this particular solar panel produce?
http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100660082
It lists “Max output 123 watts , 7.16 Amps” but is that per day, per hour or minute?
How much watts does the average AC unit use?
How much does an energy efficient lightbulb use?
All in all let’s hypothetically say we no longer use the electric company for our energy source, How many of these panels do you estimate it would take to supply our small home?
Some great answers
123 max watts is per hour I live in an area that has 5.5 average sun hours per the solar insolation data which would give me a base of 676 watts produced per day for one panel.
That 123 watts is most likely STC or standard test conditions which is far from standard it is ideal 70 degrees Farenheit with a 1000 set flash
PTC or physical test conditions are not always on labels and are not always accurate because of varied conditions. Heat has a huge factor on PV production. The panels should be derated by for the following reason
ampacity correction or line loss
Temperature correction
PTC correction
Inverter loss
these corrections account for about 15 % on standard panels
Our 676 watts per day has been dropped to 574 watts per day per panel
Lets start with the light bulb. a standard 60 watt bulb uses 60 watts per hour. With the one panel we have chosen it would produce 5 hours and 45 minutes of illumination
If we switch to a 15w CFL we get 38 and one half hours of illumination
quite a difference yes
Central Air will use about 2000 to 2500 watts per hour.This rule is not hard and fast as units will vary as well as conditions
Lets use 2000 per hour times 8 hours of use is 16,000 watts we need 28 panels just for the ac. Probably another 28 for the rest of the house
Of course these panel must be true south at 15 degrees mounted
With a years worth of electric bills and a site visit I could come allot closer but lets say you need 60 of these panels
this system would provide 973kHw per month at my location of 5.5 sun hours per day
This would be a grid tied system as most state rebates require a grid tied system to qualify for rebates
PowerJack 1200w Solar Grid Tie Inverter in cabinet outside.
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