General
Intended use The Fronius Ohmpilot is an addition to the Fronius product portfolio in the field
of energy management. The device controls the heating of hot water using sur-
plus energy from a photovoltaic system. Any other use is considered improper.
System compon-
ents required
-
GEN24 inverter
-
Fronius Primo / Symo GEN24
-
Fronius SnapINverter
-
Fronius Symo / Galvo / Eco or Primo (from Fronius Datamanager 2.0
software version 3.8.1-x onwards) or Fronius Symo Hybrid (from Fronius
Hybridmanager software version V1.8.1.x onwards)
-
Fronius Smart Meter
-
Fronius Ohmpilot
-
Resistive load (e.g. boiler with heating element)
Integrating the
Fronius Smart
Meter
To operate the Ohmpilot, a Fronius Smart Meter is required to measure the sur-
plus energy. On the user interface of the inverter, it is necessary to set whether
the Fronius Smart Meter is installed at the feed-in point or in the consumption
branch.
Description of
the device
The Ohmpilot uses pulse width modulation to regulate the surplus power from
the photovoltaic system for one phase. With one phase, it is possible to control a
heating element with a continuously variable output of up to 3 kW for example.
The Ohmpilot has two additional outputs for switching further phases. This
means that heating elements with an output of 300 W to 9 kW can be controlled.
For a heating element with 9 kW output, the surplus power of 0 - 3 kW is con-
trolled in phase 1. If more power is available, the Ohmpilot switches to phase 2.
Phase 1 can therefore be continuously adjusted between 3 and 6 kW. If the avail-
able power is > 6 kW, the Ohmpilot adds phase 3. Phase 1 is again continuously
adjusted between 6 and 9 kW
Power range Phase 1 Phase 2 Phase 3
0 - 3 kW 0 - 3 kW continu-
ously variable
- -
3 - 6 kW 0 - 3 kW continu-
ously variable
3 kW fixed -
6 - 9 kW 0 - 3 kW continu-
ously variable
3 kW fixed 3 kW fixed
Other resistive loads such as infra-red heaters and towel dryers can also be con-
trolled.
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