DO NOT MERGE tests for pv panel

[MaaJoo13]

Summary of the discussion

DO NOT MERGE

tests for pv_panel facade, results can be found in examples/scripts/test_pv.xlsx

Two options are valid:

• Link pv_panel capacity to the source capacity with a Constraint, so pv_panel capacity will be in m²
• this is only problematic if the power output of the modules installed on 1m² is higher than 1kW (not likely, but maybe possible...please test for a location close to the equator where panels have small tilt and are close to each other as well as high irradiation values)

• keep pv_capacity openly expandable and it will automatically be the maximum power output of the pv_panel within the provided time series
• this maximum power output is usually lower than the real peak capacity
• the real peak capacity can be accessed from the facade, please look at the PR#51 from feature/pv

Please note that all bad configurations from test_pv_noload_1 (cut off/scaled down profiles) should be applicable to test_pv_noload_8 with the final pv-panel-8 facade. I just didnt test all of them.
Volatile (evtl. with excess to be safe) or dispatchable with profile can both be used as a source.
They can both be fixed or optimized up to capacity_potential.

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