Explanation of Used Terms
|
Term |
Explanation |
|---|---|
Self-sufficiency quota | Current ratio of internal power supply to total consumption The loads can cover their energy demand from the PV system, from the utility grid, and from any available batteries. |
Battery discharging | Power that is currently being drawn from the battery. Battery discharging takes place when the energy demand of the loads exceeds the current power of the PV system. |
Battery charging | Power that is being currently charged from your system into the battery |
Battery cycle | In a battery cycle, the battery is discharged once from 100% of the nominal capacity to a depth of discharge specified by the manufacturer and than recharged up to 100% of the nominal capacity. |
Direct consumption | Power that the loads draw directly from the PV system Flexible loads are switched on at the time when their energy demand is completely covered by the PV system. |
|
Self-consumption |
Generated PV power is consumed at the site where it is generated. Self-consumption is made up of direct consumption and battery charging. |
Self-consumption quota | Current ratio of self-consumption to PV power |
Internal power supply | Supply of loads with PV energy generated on site Internal power supply is made up of direct consumption and battery discharging. |
|
Intermediate storage |
Battery charging and discharging as a measure of energy management The intermediate storage enables the consumption of PV energy independent of the time of generation, e.g. in the evening or during bad weather. This means that time-controlled electrical appliances can also be operated with PV energy. |
Energy management | The total of all measures for optimizing the consumption of the energy made available by a PV system. The objective of energy management is either the highest possible self-sufficiency quota or the highest possible self-consumption quota. |
Energy Management System | System for optimizing energy flows automatically and intelligently, for increasing self-consumption or improving internal power supply |
Battery-backup function | Capacity of an energy management system to also function as a battery-backup system (in the context of these planning guidelines) |
Grid supply | Electric power that is currently being drawn from the utility grid |
Purchased electricity meter | Energy meter for recording purchased electricity |
Grid feed-in | Electric power that is currently being fed into the utility grid |
Feed-in meter | Energy meter for recording the grid feed-in |
PV Generation | Electric power that is currently being provided by the PV system |
PV production meter | Energy meter for recording the PV generation |
|
Cycle stability |
Characteristic for the service life of a battery The cycle stability indicates how many times a battery can be discharged and charged before the available battery capacity falls below a specific value (see the battery manufacturer's specifications). |