What is the resistance used on the photovoltaic panel

What is the characteristic resistance of a solar cell?

The characteristic resistance of a solar cell is the cell's output resistance at its maximum power point. If the resistance of the load is equal to the characteristic resistance of the solar cell, then the maximum power is transferred to the load, and the solar cell operates at its maximum power point.

What causes series resistance in a solar cell?

Series resistance in a solar cell has three causes: firstly, the movement of current through the emitter and base of the solar cell; secondly, the contact resistance between the metal contact and the silicon; and finally the resistance of the top and rear metal contacts.

What is the shunt resistance of a solar cell?

The area of the solar cell is 1 cm 2, the cell series resistance is zero, temperature is 300 K, and I 0 is 1 x 10 -12 A/cm 2. Click on the graph for numerical data. An estimate for the value of the shunt resistance of a solar cell can be determined from the slope of the IV curve near the short-circuit current point.

How are photovoltaic panels rated?

Hence photovoltaic panels are usually rated in terms of their ‘peak’ watts (Wp). The fill factor (FF), is a measure of the junction quality and series resistance of a cell. It is defined as Obviously, the nearer the fill factor is to unity, the higher the quality of the cell.

How does series resistance affect the IV curve of a solar cell?

However, near the open-circuit voltage, the IV curve is strongly affected by the series resistance. A straight-forward method of estimating the series resistance from a solar cell is to find the slope of the IV curve at the open-circuit voltage point.

How do you calculate the resistance of a solar cell?

The characteristic resistance of a solar cell is the inverse of the slope of the line, shown in the figure above as V MP divided by I MP 1. For most cells, R CH can be approximated by V OC divided by I SC: R C H = V M P I M P ≈ V O C I S C R CH is in Ω (ohms) when using I MP or I SC as is typical in a module or full cell area.