photovoltaic current

[Pooja-S]

RTSLVU, do u no where i can get the datasheets for a small solar cell of about Pmax = 5 to 10 Watt. 

[RTSLVU]

Here is a link to a company that has several datasheets online http://www.solarcellsales.com/techinfo/technical_docs.cfm

Also you could try a Google Search 

Did the formula node idea work for you?

[Pooja-S]

Yes we can do it with the formula node u gave me. But i already draw the vi, see my previous vi, i have connected wires to carry out the formula. Both are same, but yours is much more easier. i am sending u a datasheets, do u hv any idea how to use the datasheets to put the values in my vi.

[Zach-H]

Could you be more specific on how you want to use the datasheet? It's a PDF so LabVIEW won't be able to read in information from it directly, but I'm assuming you don't need it to. Are you just wanting to know which constants you should use?  

[Pooja-S]

IL = G / 1000 X Isc

G = knob

Isc = 300, 400, 500

How can we put the above formula in a case structure. See attachments.

[Pooja-S]

Hi, i have tried to do it. Please see if its good according to the formula i gave. Thanks.

[Pooja-S]

Hi Zach, hope you are doing well. i need to calculate the efficiency. please see my effort.

Efficiency = power out / power in
Power out = Max power
power in = Area x Irradiance (IL)
please see attachments.
When running the program, i am getting power Negative. Why so? can you correct that?

[Ben]

Negative power.. that is like it is sucking up energy rather than actually producing any.

Concidering the context, that seems right to me.

Ben

[RTSLVU]

This may be slightly off track but... Considering shading on a solar array it's not as simple as 10% shade = 10% decrease in power output.

You need to take into account the design of the panels and wiring of the array.

If you shade one or two panels in a series array the entire array can go down or it's total power output can drop by a huge amount.

For shading a single panel it can be the same or different depending on the design of panel as most are a series/parallel arrangement of solar cells.

[Pooja-S]

RTSLVU, i appreciate your reply. But can you give me an example of how the design of the panels and wiring of the array can be corrected. Consider my program itself. Also please consider the shading. How can this be done. Thanks.