PV*SOL Expert 6.0 - Manual - Valentin Software

10.1.2.6 Back-up generator
(stand-alone) System > Technical data > Option System with back-up generator > Back-up generator
If you plan a system with a Back-up generator, a corresponding tab appears.
The following data on the system are displayed in summary:
PV output, gross area, active solar surface
-> Requirement:
On the System page, the option System with back-up generator is selected.
-> How to proceed:
1. Enter the Power rating.
2. Enter the Minimum power output of the intended back-up generator.
A back-up generator which should always meet consumption in an emergency must be able
to supply the maximum power of the appliances (corrected with the battery charger
efficiency). The generator modulates between the minimum and maximum power output.
With a single-stage generator, the minimum power output is the same as the power rating.
3. Enter the Fuel consumption. This is required to calculate pollutant emissions and
for the Economic efficiency calculation.
4. The Maximum power of the appliances and the Total battery capacity are
displayed.
Battery charger
5. Enter the Efficiency of the AC/DC conversion.
6. Enter the Switch on threshold (related to the nominal battery capacity), which may
not be lower than the battery's discharge threshold (see page Charge controller).
7. Enter the Switch off threshold (related to the nominal battery capacity) for the
battery charging.
8. Enter the Switching on times for battery charging.
The back-up generator always ensures security of supply for the appliance and
adherence to the lower battery discharge threshold. Once the back-up generator
has turned on due to the battery reaching the lower discharge threshold, it only
switches off on reaching the switch off threshold. A condition for this, however, is
that the time switch is activated.
! As meeting the requirements of the appliances takes priority, the battery also
charges when the generator is supplying too much energy to meet the load on
account of its minimal power output.
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