NOTE!
The minimum charging power of electric vehicles is usually 1.38 kW.
In the case of smaller photovoltaic systems, it may make sense to set the start-up power
level below 1.38‑kW so that sufficient energy is charged. The electricity that is not
covered by the photovoltaic system, however, is drawn from the grid. This results in a
power mix of self-consumption and grid supply.
▶
A start-up power level below 1.38 kW results in a power mix.
Charging with PV surplus can be activated and adjusted in the Fronius Solar.wattpilot
app (see Cost optimisation).
Priorities in the system between battery, Ohmpilot and Wattpilot
The priority of the Wattpilot can be influenced via the "PV battery limit value" and "Ohm-
pilot limit value" settings in the Fronius Solar.wattpilot app (see chapter Cost optimisa-
tion). Depending on the level of the selected limit values, it is possible to define under
which conditions the charging of the electric vehicle starts. The temperature limit value of
the Ohmpilot can only be used if a temperature sensor is connected to the Ohmpilot. To
set the Wattpilot priority, the energy management priority settings on the website for the
inverter must also be taken into account.
NOTE!
If no temperature sensor is connected to the Fronius Ohmpilot, a temperature of 0 °C is
assumed. If the Wattpilot is to be prioritised over the Ohmpilot, set the "Ohmpilot limit
value" to 0 °C. In the event of a sensor break, the Ohmpilot is supplied with power before
the Wattpilot.
Example: Charging the electric vehicle first
The electric vehicle must always be charged with PV surplus before the battery and the
Ohmpilot. In the Solar.wattpilot app, the limit value for the battery is set to 0% and the
limit value for the Ohmpilot is set to 0 degrees. The electric vehicle is immediately
charged with PV surplus, regardless of the state of charge of the battery or the temperat-
ure of the Ohmpilot.
- System with inverter, Wattpilot, battery and Ohmpilot
Priority in the inverter Wattpilot Battery** Ohmpilot
Battery** > Ohmpilot Priority 3 until SOC*
and temperature limit
value reached, then 1
Priority 1 until SOC*,
then 2
Priority 2 until temper-
ature limit value
reached, then 3
Ohmpilot > Battery** Priority 3 until SOC*
and temperature limit
value reached, then 1
Priority 2 until SOC*,
then 3
Priority 1 until temper-
ature limit value
reached, then 2
- System with inverter, Wattpilot and Ohmpilot
Priority in the inverter Wattpilot Ohmpilot
Ohmpilot Priority 2 until temper-
ature limit value
reached, then 1
Priority 1 until temper-
ature limit value
reached, then 2
- System with inverter, Wattpilot and battery
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