PV*SOL Expert 6.0 - Manual - Valentin Software

PV*SOL Expert 6.0 - Manual
Own Consumption - PV System
The PV system’s own consumption comes from the energy used by the inverter, when no
PV energy is being produced. During the day, the inverter draws on the grid for its stand-by
consumption. At night, if the inverter is not switched off completely, it also draws energy
for night consumption. Both dimensions are entered in the characteristics for the Inverter.
Net Present Value
The Net Present Value is calculated from the:
208
• Cash Value of all Annual Costs
• Cash Value of all Annual Lodgements and Savings
• Cash Value of Loan Payments
• Cash Value of Tax Payments
• One-off Payments
• Subsidies
• Self-Financing
Payback Period
The period required to get to the point when the net present value of the investment
first becomes positive.
Performance Ratio
The performance ratio is a measurement of the energy losses within the system that occur
in comparison with the system’s nominal output. The nominal output is calculated from
the irradiation onto the tilted PV surface multiplied by the module efficiency under
standard test conditions (25 C, 1000W/m²).
PV Array – Direct Energy Use
Direct energy use means the energy that flows direct (without being stored before use) to
the appliances. With alternating current appliances, however, the energy will have to be
converted to AC by the stand-alone system inverter, before it can be used to cover
electricity consumption.
PV Array – Energy Surplus
An energy surplus occurs if the solar energy available is not required by the appliances
and the battery is charged.
PV Array – Generated Energy
The generated energy is the energy exiting the PV generator. Losses through MPP tracking
are not accounted for. These dimensions also include any PV array surplus that may occur.