*3.3.4 Battery calculations*

The required battery capacity = battery capacity/depth of discharge The required battery capacity = 12.31/0.4 = 30 The available capacity 70AH

**447**

**Table 2.**

*Application of Solar Energy in Medical Instruments (Microscope)*

Number of batteries = 30.78 / 70 = 0.44 ≈ 1 battery

The No. of batteries = capacity batteries/the available capacity

The charge controller load current = maximum current cell\*the number

Microscope device is selected because it is a simple device does not consume high power compared with other devices, Electrical specifications for the Microscope:

Standard test condition at: 1,000 w\m**2** solar irradiance. Cell temperature

**Type of module Wp Isc Ipm** 50 3.01 2.76

*DOI: http://dx.doi.org/10.5772/intechopen.97177*

Appropriate regulator = 3.5\*1 = 3.5A

Inverter = overall capacity/inverter efficiency

*3.3.5 Regulator calculations*

*3.3.6 Inverter calculation*

*3.3.7 System components*

Solar cell 50 W Battery 60 Ah Regulator 20A Inverter 21.05 W

**3.4 Testing instruments**

In the case (AC):

In the case (DC):

*3.4.2 PV module*

25°C, AM 1.5.

Input 12 V, 1.6 A, 19.2 W.

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

*Solar modules electrical specifications.*

Input 220 V; output 6 V, 3.3A, 20.4 W.

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

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

*3.4.1 Load*

Inverter = 21.05 Watts

of modulus Isc = 3.5A The No. of batteries = capacity batteries/the available capacity Number of batteries = 30.78 / 70 = 0.44 ≈ 1 battery
