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Self-consumption
The power generated by the fuel cell module is used in
the same building or exported to the grid. If the power
consumption is higher than the generated power, the
total generated power is used in the building. This
makes sense if the feed-in remuneration is lower than
the power supply price. Activate the energy manager
to optimise self-consumption.
Energy manager
The energy manager optimises the fuel cell start times
using the power consumption and heat demand within
the building.
The following data are used for heat demand:
Time program for room heating
Set room temperature
Time program for DHW heating
Set DHW temperature
The energy manager calculates the expected fuel cell
module runtimes using the heat demand. The fuel cell
module only switches on if the expected runtime is at
least 2 hours.
A power consumption profile is used for the power
consumption:
For systems with an energy meter, the power con-
sumption profile is calculated from the consumption
data of the last 72 hours.
For systems without an energy meter, a standard
profile is used.
The start times are determined by the other factors in
the control strategies. You can choose 2 control strat-
egies:
Economical operation:
The fuel cell module start times are selected to mini-
mise energy costs in the following 24 hours.
Ecological operation:
The fuel cell module start times are selected to mini-
mise CO2 emissions in the following 24 hours.
For economical operation, the following factors are
taken into account:
Heat demand of the building
Power consumption profile
Feed-in remuneration
Power supply price
Thermal energy generated
Gas consumption
Gas price
Your contractor can adjust the prices if required.
For ecological operation, the following factors are
taken into account:
Heat demand of the building
Power consumption profile
Thermal energy generated
Gas consumption
CO2 emissions of the gas
CO2 emissions of the power exported to the grid
CO2 emissions of the energy drawn from the grid
Note
If the energy manager is switched off, the fuel cell start
time is determined only using the heat demand. The
heat demand within the building must be high enough
to achieve a runtime of at least 2 hours.
Example
You have selected economical operation.
The calculated heat demand produces an expected
runtime of 4 hours. The calculated power consumption
profile can be seen in Figure 5.
Based on the energy costs calculated from the other
factors, the next start time is calculated using the low-
est energy costs over the runtime, in this case 09:00.
Appendix
Terminology (cont.)
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