What Are the Requirements for High Energy Self-Sufficiency and Self-Consumption Quotas?
The first important requirement for effectively increasing the internal power supply and self-consumption is the right balance between annual PV generation and annual energy demand:
If the annual PV generation is considerably lower than the annual energy demand, a significant proportion of the PV energy can almost always be used on site. This also applies when the timing of the main energy demand and the main PV generation do not coincide exactly. The high self-consumption quota is then purchased with a low self-sufficiency quota.
If, however, the annual PV generation is much higher than the annual energy demand, only a small proportion of the PV energy can be used on site. Much of the generated PV energy must be fed into the utility grid. This results in a low self-consumption quota. The self-sufficiency quota, on the other hand, is higher.
A changed ratio of PV generation to electrical consumption, therefore, always increases either the self-sufficiency quota or the self-consumption quota. For this reason, the right balance between energy generation and energy consumption is indispensable.
A second important requirement for a high self-sufficiency quota and a high self-consumption quota is an appropriate load profile: The distribution schedule of the PV power is defined in quite narrow limits by the alignment of the PV array and the weather. For this reason, the load profile determines almost solely how well PV generation and energy demand match each other during the course of the day. Besides using electrical storage systems, effective matching of the load profile is the only way to simultaneously optimize both the self-sufficiency quota and the self-consumption quota.
Parameters for internal power supply and self-consumption
The internal power supply is specified by the self-sufficiency quota.
The self-consumption is specified by the self-consumption quota.