The best photovoltaic solar panels
Thought I would share some information on what are rated as the best/most efficient panels available. Sanyo HIT Power N Series. The cells are hybrids of monocrystalline silicone, surrounded by ultr...
Forum Discussion
BFL13:
Perhaps this will help: Lets say you are charging batteries at 10A and at 14V with a charger pluged into 120V outlet. How much current will flow from the outlet at 120V?
10Ax14V=140W...140W:120V=1.17A.....so 1.7A at the input creates 10A at the output.
Now lets say you plug your battery charger into a 36V outlet. How much current will flow from the 36V outlet to produce same 10A at the output?
10Ax14V=140W...140W:36V=3.89A.....so 3.89A at the input creates 10A at the output.
If 36V and 3.89A were Vmp and Imp of the solar panel, with MPPT controller you would create charging current of 10A at 14V. With PWM controller you would get only 3.89A of charging current.
(Assuming 100% efficiency of conversion for clarity).
Panel efficiency:
Lets say you solar panel is exactly 1 square meter big. If this panel is illuminated with sun light of 1000W per square meter intensity, your panel will convert it into 1000W of electrical power, right? Wrong. All you will get is maybe 120W to 160W:
Efficiency = 120W:1000W x 100= 12%
160W:1000W x 100= 16%
Perhaps this will help: Lets say you are charging batteries at 10A and at 14V with a charger pluged into 120V outlet. How much current will flow from the outlet at 120V?
10Ax14V=140W...140W:120V=1.17A.....so 1.7A at the input creates 10A at the output.
Now lets say you plug your battery charger into a 36V outlet. How much current will flow from the 36V outlet to produce same 10A at the output?
10Ax14V=140W...140W:36V=3.89A.....so 3.89A at the input creates 10A at the output.
If 36V and 3.89A were Vmp and Imp of the solar panel, with MPPT controller you would create charging current of 10A at 14V. With PWM controller you would get only 3.89A of charging current.
(Assuming 100% efficiency of conversion for clarity).
Panel efficiency:
Lets say you solar panel is exactly 1 square meter big. If this panel is illuminated with sun light of 1000W per square meter intensity, your panel will convert it into 1000W of electrical power, right? Wrong. All you will get is maybe 120W to 160W:
Efficiency = 120W:1000W x 100= 12%
160W:1000W x 100= 16%
