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What's the update interval for SolarEdge monitoring?
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Array cell temp. is usually above air temp. primarily as f(P.O.A irradiance, wind vector, a few other things). Under bright cloudless skies and a moderate wind and near normal incidence angles, cell temps will run very approx. 25 to 30 C above the amb. air temp. around the array. A dark colored roof will raise the air temp. a few to maybe 5 deg. C above the ground level amb. air temp.Comment
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If you auto-upload from Wunderground, yes, PVOutput's temperature field shows ambient temperature. If you choose not to link to Wunderground, but instead enable temperature data from the inverter in the SolarEdge auto-uploader, it is a temperature reading from inside the inverter itself. Unfortunately, I don't think temperature from both sources is supported, which is why I create two systems on Pvoutput for the same installation. One of them will display ambient temp (rooftop temp form my Davis weather station, when installed), while the other displays inverter temp.CS6P-260P/SE3000 - http://tiny.cc/ed5ozxComment
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If you auto-upload from Wunderground, yes, PVOutput's temperature field shows ambient temperature. If you choose not to link to Wunderground, but instead enable temperature data from the inverter in the SolarEdge auto-uploader, it is a temperature reading from inside the inverter itself. Unfortunately, I don't think temperature from both sources is supported, which is why I create two systems on Pvoutput for the same installation. One of them will display ambient temp (rooftop temp form my Davis weather station, when installed), while the other displays inverter temp.Comment
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I have both temperatures enabled. There is an option to push the Wunderground temperature to an extended value instead of the standard location (as well as solar radiation). You can then plot ambient temperature on the extended graph. I also added a formula because it comes in Celsius and I want it in Fahrenheit.CS6P-260P/SE3000 - http://tiny.cc/ed5ozxComment
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I have both temperatures enabled. There is an option to push the Wunderground temperature to an extended value instead of the standard location (as well as solar radiation). You can then plot ambient temperature on the extended graph. I also added a formula because it comes in Celsius and I want it in Fahrenheit.
Here's the problem: I set the outside air temperature to report in deg-F from WU, but PVOutput still displays it as deg-Celsius. If I send the WU temperature data to the MAIN graph/table, it correctly displays the temperature in deg-F. There doesn't seem to to be an option on PVOutput to send the inverter's temperature data to the extended graph. jasonvr mentioned that he applied a formula (deg-C * 9/5 + 32?) somewhere to get the extended graph to plot in deg-F. Where/how do I inject this formula? Do my settings look OK?Last edited by Woodworkerii; 07-05-2017, 04:16 AM.Comment
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I get Fahrenheit by adding a rule in the "Extended Data Rule" section:
v7 = 1.8 * v7 + 32;
It would be v9 instead based on your setupComment
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Another small change to consider in your settings... The "summary" column in the extended data is set to "last". If you set that to "change", when you look at your data in the daily view instead of the intraday view, I think it will display the range for the day instead of just the last value.CS6P-260P/SE3000 - http://tiny.cc/ed5ozxComment
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Another small change to consider in your settings... The "summary" column in the extended data is set to "last". If you set that to "change", when you look at your data in the daily view instead of the intraday view, I think it will display the range for the day instead of just the last value.
Thanx.Comment
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If cell temperature (or at least the backsheet surface temperature of a PV panel) is measured by a device that has the ability to communicate it at some intraday interval, it can be sent directly to PVoutput. You are aware of the complications involved in getting that measurement accurately and reliably, so I won't go into that here.
P.O.A. irradiance is not produced or provided by PVOutput, although they have a rough "insolation" function that attempts to show what clear sky output on that day might look like for the location and array orientation entered by the user. I was never successful in figuring out what particular model they use, but it clearly didn't handle temperature correctly when I last looked into it.
PVoutput allows some basic function writing using the uploaded data, as in the C to F conversion described a few posts ago. It doesn't really support the more complicated equations necessary to combine time, location, array orientation, ambient temperature, and wind speed to implement models like those used in PVWatts or SAM, or the extensions to those models like what you have worked on that are even more tuned to your system.
When I get my weather station active again, I would like to use the CEC model that I translated in python over the winter to see how it compares to my actual conditions and live output. I would still rely on the NOCT model of cell temperature, at least at first, until I can start experimenting with small footprint sensors that could mount directly to the panels. I would be able to upload the model output to the extended values in PVOutput, along with any intermediate calculations (like P.O.A. irradiance) that are useful to see.
Probably not the answer you were looking for, but I hope that providing some extra context for those unfamiliar with the terms you were asking about is ok.CS6P-260P/SE3000 - http://tiny.cc/ed5ozxComment
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PVoutput can be linked to a Wunderground site and pull the data available. Usually, that is ambient temperature at that station and irradiance measured by a horizonal sensor, if the station is equipped for that.
If cell temperature (or at least the backsheet surface temperature of a PV panel) is measured by a device that has the ability to communicate it at some intraday interval, it can be sent directly to PVoutput. You are aware of the complications involved in getting that measurement accurately and reliably, so I won't go into that here.
P.O.A. irradiance is not produced or provided by PVOutput, although they have a rough "insolation" function that attempts to show what clear sky output on that day might look like for the location and array orientation entered by the user. I was never successful in figuring out what particular model they use, but it clearly didn't handle temperature correctly when I last looked into it.
PVoutput allows some basic function writing using the uploaded data, as in the C to F conversion described a few posts ago. It doesn't really support the more complicated equations necessary to combine time, location, array orientation, ambient temperature, and wind speed to implement models like those used in PVWatts or SAM, or the extensions to those models like what you have worked on that are even more tuned to your system.
When I get my weather station active again, I would like to use the CEC model that I translated in python over the winter to see how it compares to my actual conditions and live output. I would still rely on the NOCT model of cell temperature, at least at first, until I can start experimenting with small footprint sensors that could mount directly to the panels. I would be able to upload the model output to the extended values in PVOutput, along with any intermediate calculations (like P.O.A. irradiance) that are useful to see.
Probably not the answer you were looking for, but I hope that providing some extra context for those unfamiliar with the terms you were asking about is ok.
I appreciate the response.Comment
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If cell temperature (or at least the backsheet surface temperature of a PV panel) is measured by a device that has the ability to communicate it at some intraday interval, it can be sent directly to PVoutput. You are aware of the complications involved in getting that measurement accurately and reliably, so I won't go into that here.https://pvoutput.org/list.jsp?userid=59404Comment
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There are no commercial systems I am aware of that attempt to measure or report panel temperature. Only home-brew instrumentation for those with the time and money to burn. Solaredge will tell you inverter temperature.CS6P-260P/SE3000 - http://tiny.cc/ed5ozxComment
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Also, keep in mind that panel temps., average or otherwise, are not ambient temps.. and the GHI (Global Horizontal Irradiance (or insolation)), needs to be converted to P.O.A. (Plane of Array) irradiance or insolation if information on efficiencies or efficiency comparisons or other parametric information is sought.
Last edited by J.P.M.; 07-05-2017, 03:59 PM.Comment
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