# Deviation from the nominal module temperature

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Hallo,

Deviation from the nominal module temperature kWh 1.01E-05

can someone explain what is this unit and what it trying to tell normally temp. unit should be in celcilus or in kelvin  but here it is in kWh.

Regards,

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Hello Nimesh

1 hour ago, Nimesh said:

can someone explain what is this unit and what it trying to tell normally temp. unit should be in celcilus or in kelvin  but here it is in kWh.

Sure!

Let's start by looking at the carpet plot for the whole year and this datapoint Deviation from the nominal module temperature on the page Results using the Diagram Editor:

Every step gives us the gains or losses due to temperatures deviating from STC conditions. I chose a location in north Germany, so in the beginning (1) of the year we do have gains due to temperature and by day in the summer (2) we do have losses.

The value you speak of is from the exported results where many values are calculated from power to energy for the corresponding time steps. So this value gives you the gains/losses in kWh for this time step.

Kind regards
Frederik

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Thankyou verymuch for your help, Mr. Frederik

1)

I also have one another question, here I need one perticular day's I_V curve is it possible to get it? for example I need I_V or V_P (resulting curve) of one perticular day like 16 july, if it is possible, here I saw in PVsol. It saws ever minutes values chart which I do not want.

Only one perticular day's genaration(I_V or V_P - resulting curve of day) on one graph I need.

2)

Another thing is, I made few system for observation in all system it saws I_V curve option, but in one system which is simple design 5 module on east and 5 on west facing without shading< I am not able to see I_V curve I did change in setting and start recording of charachteristic curve option but still it is showing me only same message. does it requires something special to Highlights I_V Values?  I am attaching SS.

regards,

Nimesh

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Hello Nimesh

2 hours ago, Nimesh said:

1)

I also have one another question, here I need one perticular day's I_V curve is it possible to get it? for example I need I_V or V_P (resulting curve) of one perticular day like 16 july, if it is possible, here I saw in PVsol. It saws ever minutes values chart which I do not want.

Only one perticular day's genaration(I_V or V_P - resulting curve of day) on one graph I need.

Sometimes PV*SOL needs to be forced to re-simulate. In this case -- after you did set up the recording of I-V-curves in the options -- I would recommend it.

You can force a fresh simulation via Options > Force simulation or with CTRL+F5:

Then you should be able to find the I-V-curves on the page Results.

2 hours ago, Nimesh said:

2)

Another thing is, I made few system for observation in all system it saws I_V curve option, but in one system which is simple design 5 module on east and 5 on west facing without shading< I am not able to see I_V curve I did change in setting and start recording of charachteristic curve option but still it is showing me only same message. does it requires something special to Highlights I_V Values?  I am attaching SS.

This one might be connected to the same problem -- the need for a fresh simulation since the results are not existing.
Could you try a new simulation? If this doesn't help please get back.

Kind regards
Frederik

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Hallo,

As you said I try force simulation which did not work and also I made new whole system but I am not seeing I_V Curve in this system, I am not understanding what mistake I did. I am sharing you that file here. if can have a look and tell.

Thankyou.

Regards,

Nimesh

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Hello Nimesh

Hm. Did you activate the recording of characteristics for modules via Options > Project Options > Simulation (1)?
After setting to All or MPP# you should be able to plot the Characteristic curves (2) on the page Results:

It works for me.
Does this help?

Kind regards
Frederik

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Hallo,

Yes, I did active recording of characteristics for modules via Options > Project Options > Simulation (1)
After setting to All or MPP#.

I am doing this same as you said since few days but it is showing me same message like do active recording of characteristic for modules which is active already. still it is not working in my pc.

by the way thankyou for your help.

regards,

Nimesh

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Hi Nimesh

12 minutes ago, Nimesh said:

I am doing this same as you said since few days but it is showing me same message like do active recording of characteristic for modules which is active already. still it is not working in my pc.

Could you do me a solid and send me your .pvprj project file after you did the following?

• Set the recording of I-V-curves to All
• Activate the saving of all results into the .pvprj file
• Enforce a re-simulation CTRL+F5
• Save the project

Frederik

Hallo,

Here it is.

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Hello Nimesh

I cannot reproduce your issue, I'm afraid.

I checked your .pvprj file (a zip file basically) if it contains the i-v-curves and it does:

When opening your .pvprj file, I just could open the characteristic curves on the page Results:

At the moment I do not know what seems to be your issue.

I saw that you updated an earlier post of you, where it seemed to be in order:

1 hour ago, Nimesh said:

Does this problem still exist?

Kind regards
Frederik

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Yes problem still exist.

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Hello Nimesh

In case you do not save characteristic curves to your project file (1) (.pvprj), PV*SOL does not have any characteristics to plot, even if you activated the recording of the characteristic curves. The word recording might be misleading; it does mean it records the characteristics while simulating.

So after opening a file with recording activated but not saved, the page Results opens without a simulation but the characteristics are missing. That is why you do have to re-simulate via CTRL+F5.

Kind regards
Frederik

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Dear Sir

No It is not working. I marked one thing in my pvsol that it is giving I_V curves only in shading files as I create shading it start giving I_V Curves and as I delet that shading it again stop giving curves.,

Quote

So here i have put on random roof in design which do not affect my system and system start giving curve.

2) Second Question, I am trying to find I(Current) DC and V (Voltage) DC  in Excel sheet but I am not finiding, If you could guide where can I find DC- Current and Voltage before converting it into AC, a Clear DC Currernt and Voltage which are coming directly from panels in total.

Here, I obtained DC current and voltage values from a graph by right-clicking and copying the data. However, these data are sampled at a high frequency, with several data points per minute. It's impractical to manually copy and paste every minute's worth of data into Excel, especially considering that each minute contains at least 12 data points for both current (I) and voltage (V). I need to condense this data to one data point per minute to make it more manageable. Do you have any suggestions for a solution?

regards,

Regards,

Nimesh

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Hi Nimesh

On 2/22/2024 at 2:56 PM, Nimesh said:

No It is not working. I marked one thing in my pvsol that it is giving I_V curves only in shading files as I create shading it start giving I_V Curves and as I delet that shading it again stop giving curves.

Ah, my bad. There was an issue which should be fixed with version 2024 R4.

On 2/22/2024 at 2:56 PM, Nimesh said:

Do you have any suggestions for a solution?

Yes.

After saving your project (with saving of the I-V-characteristics enabled) you could open the .pvprj file with an archiver, e.g. 7zip.
Within the .pvprj archive there should be a folder called similar to iv_noshadow:

On 2/21/2024 at 11:45 AM, developer_fw said:

I checked your .pvprj file (a zip file basically) if it contains the i-v-curves and it does:

which contains one characteristic curve per timestep as x-y-value-pairs:

Kind regards
Frederik

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