Kospel EKCO.M3, Руководство по сборке и эксплуатации

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PL-090B_f. 29
Cooperation with PV installation
Photovoltaic systems are usually equipped with software controlling the external load
in order to increase the degree of energy self-consumption within the internal (home)
network. High self-consumption means consuming as much energy as possible produced
by PV system. Depending on the performance of the inverter, the external power control
can be carried out on the basis of the power generated or the excess power generated.
Control on the basis of excess power generated is the optimal solution, as the energy
that would be returned to the operator’s grid will be consumed within the internal network.
However, this requires a complex inverter measuring system. In case of power-based
control, the level of energy consumption within the internal grid is unknown, therefore
energy from the operator’s grid may be selected.
Inverter’s cooperation with the boiler means modifying the operating algorithm of the
device in order to convert the excess energy produced into a controlled increase in the
temperature in the building or an increase in the temperature of domestic hot water in
the DHW cylinder.
How to connect the inverter to the boiler is shown in the diagram below:
EKCO.M3
F N
PV inverter
• •
The relay output of the PV inverter for external load management must be connected to
the boiler’s FN entry. If the inverter has a voltage output, use an appropriate intermediate
relay. In order to activate the boiler’s PV functions, it is necessary to:
1. Set the FN entry to PV mode: [Configuration >Entry FN: PV].
2. Set the working mode to Standard or Buffer: [Configuration > Working mode:
Standard/Buffer],
3. Turn off cascade mode: [Configuration > Cascade: No].
4. Set the power limit for PV function: [Configuration > Boiler rated power > PV limit].
The set value indicates the maximum boiler power to be switched on in PV mode.
In the inverter, set the power at which the relay will be shorted and the power at which the
relay will be open. Depending on the degree of sophistication of the management function,
other parameters may be available, i.e. minimum relay switching time. A prerequisite for
switching the boiler to PV mode is the short circuit of the FN entry by the inverter (after
meeting the power production criteria). In this case, limited power heating (PV power
limit) occurs if:
- the temperature of DHW will reach the set point resulting from the schedule or
manual setting,
- the room temperature reaches the set value resulting from the schedule or manual
setting.