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Grid (< P
)
MAX
PV surpluses
PV
Fig. 13. Work priorities in "PeakLoad".
When the installation's consumption is lower than the
previously-defined
are first supplied from the solar panel power and the shortfall
comes from the grid, while the battery is charged from the
grid surpluses (these surpluses are the grid power that is
missing until the
panel surpluses, if there are any.
Scenario 2:
Consumption of the installation higher than
2.
but solar panel power higher than the consumption peak.
Fig. 14. "PeakLoad2" function diagram
Grid (= P
)
MAX
PV surpluses
PV
Fig. 15. Work priorities in "PeakLoad2".
In this case, the installation's consumption is higher than
P
, resulting in an over-peak consumption, but this over-
MAX
peak is settled with the solar panel power. Their surpluses are
directed to the battery charge.
Scenario
2.1: Consumption of the installation higher than
3.
P
and over-peak consumption higher than solar panel
MAX
power.
Fig. 16. "PeakLoad2.1" function diagram
66
Prioritisation
Battery charge
Supplying the loads
1
2
2
-
-
1
P
parameter, the consumption loads
MAX
P
value is reached) and from the solar
MAX
Prioritisation
Battery charge
Supplying the loads
-
2
1
-
-
1
Grid (= P
)
MAX
Battery
PV
Fig. 17. Work priorities in "PeakLoad2.1".
When the consumption power is higher than
the over-peak consumption is unattainable with the solar
panel power, the battery power is used to supply the missing
consumption.
To better illustrate all the scenarios described in the "Peak-
load" operation, the following graph has been created that
simulates the energy flows in a photovoltaic installation with
P
,
battery for one day:
MAX
Power (kW)
Consumption
PV generation
Battery
SOC
30%
Scenario 1
Fig. 18. Simulation of energy flows per day.
Red shows the installation's consumption, green the power
generated from solar panels, yellow the battery's state of
charge and blue the battery power (negative power indicates
that the battery is charging and positive power indicates that
it is discharging). The red line indicates the established power
limit contracted from the grid
scenarios described above can be seen clearly.
Questions
1
What is the
maximum
generation power?
2
Is there
a prioritisation
between load and
Back-up Load?
Prioritisation
Battery charge
Supplying the loads
-
2
-
3
-
1
P
MAX
Scenario 1
Scenario 2 Scenario 2.1
(P
). In Fig. 18, the three
MAX
Answers
The maximum generation power is PAC.
No, the two loads are joined as if they were just
one, even though the Back-up Load has a limit,
as mentioned in FAQ2.
and also
100%
Pmax
Time (h)
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