"Stand-Alone" system with Multiple PV Orientations (or "Grid-Connected" System with extra storage losses)

[smsas]

Good day,

I am trying to simulate a "stand-alone" system with multiple PV orientations. Each PV module will be connected to its own MPPT, so mismatch is not a problem. However, I can't find a way to aggregate the generation of all PV modules in a "stand-alone" system to check that the generation, together with the storage, is enough to satisfy a given load ("user's needs").
This is why I've used a "Grid-Connected" system with multiple PV orientations, no grid injection, with a storage system and "self-consumption" defined. However, in this system, the battery usage has an additional (and very high) energy penalty: "Battery Out, Inverter loss". For example, when there's no generation at night, I've seen that the one-way efficiency is 74% (meaning 1.35Wh to satisfy 1Wh of load), which doesn't make sense for my system. 

So, the general question I ask is: how can I better simulate my stand-alone system with multiple PV module orientations?

If there's no clear way, the more specific questions would be:
1. Can I define the PV generation in a "Stand-Alone" system so that the software will take the aggregated PV generation as input and simulate the storage and consumption? 
2. Can I define the parameters of the "battery inverter" in a "Grid-Connected" system so that the handling of the batteries in this system is more accurate (to my system)?

Thank you very much for your help!
Sebastian

 

[Zahra]

Hello,

Have you found answer for this matter?

 

[Muhammed Sarikaya]

Dear Zahra,

For a stand-alone project, which is generally small and simple, we don’t represent the inverter, because the main focus is to understand how the PV modules, along with the batteries, will meet the users’ electricity needs.

This is why it’s not possible to define an inverter with specific parameters for each MPPT in such a project.

For your first question:
No, this is not possible in PVsyst. The software does not allow you to input pre-calculated PV production as an input. In a stand-alone system, you must define the PV fields, and PVsyst will calculate the production based on those components.

For your second question:
Could you tell me which parameter you would like to modify?

Regards,