Real time monitoring voltage and current of PV using Arduino and LabView

Projects General Guidance
1

Hello everyone,
I have project to monitoring voltage and current of PV solar cell using Arduino and LabView
My components are
1- Arduino Uno
2- 12V 5.2W Polycrystalline Solar Panel 210x165x3mm
3- DC-DC step-down module 6-24v 5v3A USB phone charger 97.5% efficiency
4- digital current sensor INA219
5- DC Voltage sensor

my circuit as following
Solar cell .....> DC-DC step-down module
between them the sensors
the problem is the voltage before module is frequently depend on solar cell panel but after module is 0 voltage

what is your advice to do the project ?

2

The negative connection of the solar cells also needs to be connected to your system ground. A wiring drawing would surely help all of us.

3

I am already connect the negative with ground

4

What is the ACTUAL solar panel voltage when you do the test? You likely designed for the open circuit voltage of the solar panel.

5

between 3 - 6 V

6

That voltage range is less than what you say is the minimum voltage for the step down module.

7

so, please can you suggest a circuit ?

8

Why are you connecting the solar panel to the step-down converter?

To investigate the solar panel characteristics, connect it to an adjustable load resistor, the INA219 (ammeter) and the voltage monitor.

Outline of wiring

464×240 21.3 KB

With the Adafruit INA260 sensor, current, voltage and power can be monitored simultaneously, using only one sensor module.

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