EC POWER XRGI 20G-TO, Manual

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Version 1.0 - 2012 Manual XrGi 20G-To
3.5.4. Heat-controlled, power-controlled operation
This operating mode is guided by the property’s heat and electricity requirements, the electrical load profile for the past week
and the electricity tariff.
The XRGI system uses the load profiles saved to try to cover both heat and electricity demand optimally. High-tariff periods
take priority. If the data saved and heat requirement indicate that a surplus will be produced, this surplus will be fed in during
high-tariff periods if possible. If the data saved indicate that heat production will fall short of demand, the storage tank is (partly)
loaded and electricity is fed into the grid during low-tariff periods as an exception.
Heat-controlled, power-controlled operation should be used in particular if:
Electricity demand fluctuates and the Power Unit output regularly falls below maximum
Heat requirements are at times (e.g. in summer) lower than the heat production of the Power Unit and
Electricity costs are high.
This operating strategy is forward-looking. It works like a virtual power station, but does not produce electricity in response
to external control commands from control centres. Instead, it is based on the tariff structure, which is increasingly governed
by the power requirements of the economically less viable peak load power stations. At the same time, the property's heat
requirements are covered by the XRGI system as optimally as possible.
Comparison: demand and production in heat-controlled, power-controlled mode (example):
1. Minimum production when
tariffs are low: if heat
demand is high, electricity
is fed into the grid. Storage
tank is kept empty for high
tariffs.
2. Electricity is produced du-
ring high-tariff periods to
meet metered demand as
long as the produced heat
can be stored in the storage
tank. If heat demand incre-
ases, electricity is fed into
the grid.
3. as 1.
Fig. 3.25.
Controlled feed-in without putting own requirements at risk
Consumption 343 kWh production 288 kWh