Reading The Power/Current/Voltage of PV Panel
yaseminselim 2023-06-21 05:17:16 517 Views3 Replies Hello,
I have Gravity wattmeter module, and I want to read the current, voltage and power values of the 60W pv panel using it. I'll see it on arduino uno and get the results on excel.
I will be having no system connections it is not an on grid or off grid system. Just to see the changing of the I-V characteristics of the panel by dust in six months.
I'm not sure how to make connection. Should I think of the panel as a power supply or a load? Which connection ports should I use to see the right values?
The Electrical Characteristics of The Panel
Short circuit Current: 3.02 A
Open Circuit Voltage:24.6V
Thanks for your future help.
Thank you so much for your answer. It is possible to short circuit the PV panel because the maximum power current and the short circuit current of the photovoltaic panel is slightly different .
But this connection connects the GND and the IN- and this time I couldn't get voltage reading because the module gets the voltage by between the IN- and GND terminals so I had to use a resistive load (1 ohm, 50 W).
This time I'm having another issue which is related with the bus voltage. Module is getting a negative reading and this is less than the actual voltage (the reading of another voltmeter). I'm using the calibration code which is given on the tutorial at your web site. Can this be the problem? If so could you provide me the arduino code of the module to get the current, voltage and power reading of any load supplied with an photovoltaic panel?
yaseminselim Are you sure that the positive and negetive pole could be short circuit? This will not make the current too high?
If the "Short circuit current:3.02A" mentioned by you means that you short the + and - on your PV Panel(and it won't be broken).
I think this means your panel could be both power supply and load in this circuit.
You could refer to this picture for wiring, but this will short the PV panel. And you need to make sure that this will not damage to your PV pannel.
Yeez_B 