* set no of pv modules for MS800 GEN3PLUS inverters
* fix unit test
* increase test coverage
* change the PV module handling
- in default we set the number of modules now to
two. So with the first data from the inverter
we only register two modules. After we determine
the inverter module, the number can increase to
four and more PV modules will be registered.
With the default value of 4, we register always
4 modules and can't reduce the number of areas
when we detect that the inverter only supoorts
two PV modules
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