What might be happening that produces losses of about 20% when using Simplified Model of a Small Scale Micro-Grid example?

Dear Mathlab collaborators,

I hope you can help me to comprehend in this example of Simulink, when using Simplified Model of a Small Scale Micro-Grid I get losses of about 20 %, and I have reasured my loaded data for the model, any of you could help me to understand what is happening that produces the losses?

I think this part of the model is introducing an issue, because the solar PV is in DC and have to be transformed into AC, but why the "Load Data" is being transformed too? because they are connected to the same point. I hope you can understand my hurdle to be able to point at any workarounds.

Yours faithfully