How to calculate the annual solar energy output of a photovoltaic system?
The global formula to estimate the electricity generated in output of a photovoltaic system is :
E = A * r * H * PR
E = Energy (kWh)
A = Total solar panel Area (m²)
r = solar panel yield or efficiency(%)
H = Annual average solar radiation on tilted panels (shadings not included)
PR = Performance ratio, coefficient for losses (range between 0.5 and 0.9, default value = 0.75)
r is the yield of the solar panel given by the ratio : electrical power (in kWp) of one solar panel divided by the area of one panel.
Example : the solar panel yield of a PV module of 250 Wp with an area of 1.6 m² is 15.6%.
Be aware that this nominal ratio is given for standard test conditions (STC) : radiation=1000 W/m², cell temperature=25 °C, Wind speed=1 m/s, AM=1.5.
The unit of the nominal power of the photovoltaic panel in these conditions is called "Watt-peak" (Wp or kWp=1000 Wp or MWp=1000000 Wp).
H is the annual average solar radiation on tilted panels. Between 200 kWh/m².y (Norway) and 2600 kWh/m².y (Saudi Arabia). You can find this global radiation value here : Solar radiation data
You have to find the global annual irradiation incident on your PV panels with your specific inclination (slope, tilt) and orientation (azimut).
PR : PR (Performance Ratio) is a very important value to evaluate the quality of a photovoltaic installation because it gives the performance of the installation independently of the orientation, inclination of the panel. It includes all losses.
Example of detailed losses that gives the PR value (depend on the site, the technology, and sizing of the system) :
Of course in order to simulate the energy production of a PV system with a better accuracy and to get monthly, hourly or instantaneous electric values, you have to use tools and
softwares listed in www.photovoltaic-software.com.
Using Solar Conversion Kit, you can convert any inverter/battery set up into solar power system. You will need solar panels, battery, inverter and Solarcon (Solar Conversion Kit) for this
ساعات التشميس هي عدد الساعات التى تكون في شدة السطوع الشمسي اكثر م 800 واط ساعة / المتر المربع اما كيقية احتسابها اما بالعودة الى خرائط خاصة تبين هذه المعطيات او رسم منحنى الإشعاع الشمسي اليومي كل ساعة وحساب الزمن التى تكون في شدة السطوع الشمسي اكثر م 800 واط ساعة / المتر المربع
وفي الرسم التالي كيفية الحساب
ألواح 36 الخلية تعطي حوالي 18 فولت. وهو الجهد المثالى
لشحن بطارية 12V، لذلك، تيسمى لوحة شمسية 36 خلية 12V وهي مصممة لشحن بطارية 12V. اما ألواح 72 الخلية تعطى حوالي 36 فولت، وهو الجهد المثالي لشحن بطارية 24V. وهي مصممة لشحن بطارية 24V.
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