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System parameters turning red after performed simulation


sirihar
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Hi,

I have tried to do some simulations with the SolarEdge architecture and every time this happens: After defining the system parameteres everything ("orientation", "system" and so on) turns green and I can perform the simulation. But directly after the simulation is done, the "system" box turn red and it does not turn green again no matter what I do.

I have to start all over again with a new variant to be allowed to perform a new simulation... Bug?

And btw: should I use the "linear function" or "according to module strings" for a simulation with power optimizers? In case of module strings: what kind of fraction for electrical effect is realistic?

Siri

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Hi Siri,

I'm not sure about the System screen going red, but with regards to the shading calculation, I found that the following method best represents the SolarEdge performance under shading:

You should use 100% electrical effect, and partition the module strings in a way that will define each sub-module. A sub module is the row of cells in a module that are protected under a bypass diode. In 60 cell module you usually have 3 bypass diodes, and in 72 cell modules you will have between 3 and 6 diodes (consult the datasheet or look in the PVsyst module parameters).

So, this means that, for a 60 cell module for example, you will partition each module into three sub-modules, or 'strings'. See the image below for what it will look like:

 

196203320_PartitionIntoModuleStringsSolarEdge.JPG.2dfe40f8724d7576bf93fe26d29f03e9.JPG

 

What you will have, in effect, is many tiny 'strings', and this mimics the ability of the SolarEdge system to manage power even on a sub-module level. Using 'Linear' shading loss is a good approximation of the SolarEdge performance, but using the above method may produce more realistic results.

Note that for a traditional system, you need to partition the module strings in a size that correcponds to a whole string of modules, so you will get much larger 'rectangles' of course.

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