**3.4 Testing instruments**

*3.4.1 Load*

Microscope device is selected because it is a simple device does not consume high power compared with other devices, Electrical specifications for the Microscope: In the case (AC): Input 220 V; output 6 V, 3.3A, 20.4 W. In the case (DC): Input 12 V, 1.6 A, 19.2 W.

*3.4.2 PV module*

The **Table 2** shows specifications of solar panel**.**

*3.4.3 Electrical parameters of a Solar cell (by the manufacturer)*

Maximum power: 50 ± 3% Wp Short circuit current: 3.09A Open circuit voltage: 21.6 V Max. Power current: 2.89A Max. Power voltage: 17.3 V Standard test condition at: 1,000 w\m**2** solar irradiance. Cell temperature 25°C, AM 1.5.


**Table 2.**

*Solar modules electrical specifications.*
