Solar PV

Question 1

What is the equation for air mass?

Answer 1

Air mass = 1/cos@

Question 2

What is the equation for direct solar irradiance?

Answer 2

I (dir) = 1.353. * (0.7^1/cos@)^0.678

Question 3

What is the equations for diffused solar irradiance?

Answer 3

I (dif) = 0.1*I (dir)

Question 4

What is the definition of and gap, Eg

Answer 4

The difference in energy between the valence band (electron noun dot atom) and the conduction band (electron free to move between atoms)

Question 5

What is the wavelength of a photon where it has just enough energy to promote an electron in a silicon atom?

Answer 5

1100 nm

Question 6

What is the energy of a photon determined by?

Answer 6

Its wavelength

Shorter wavelengths have higher energy
Longer wavelengths have lower energy

Question 7

What is the Shockley-Queisser (max efficiency) for a semiconductor and at what band gap?

Answer 7

33.7% for a 1.34 eV band gap

Question 8

What is the equation for the fill factor?

Answer 8

FF = Imp * Vmp / Isc * Voc

where,
Imp and Vmp are max current and voltage where power is max

Voc is open circuit voltage
Isc is short circuit current

Question 9

What is the equation for the efficiency?

Answer 9

Efficiency = Pout (Max) / Pin

Question 10

What is the equation for the max power?

Answer 10

Max = Imp * Vmp

Question 11

Therefore, what is the efficiency equation expanded?

Answer 11

Efficiency = (FF * Voc * Isc) / Pin