If the PV surplus is above 4.14 kW, the Wattpilot switches from 1‑phase charging
to 3‑phase charging and regulates the charging power in 0.69 kWincrements.
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.wat-
tpilot app (see Cost optimisation on page 49).
Priorities in the system between battery, Ohmpilot and Wattpilot
The priority of the Wattpilot can be influenced via the "PV battery limit value"
and "Ohmpilot limit value" settings in the Fronius Solar.wattpilot app (see
chapter Cost optimisation on page 49). 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 user interface of the in-
verter 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, the
"Ohmpilot limit value" must be set 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 temperature 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 tem-
perature 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 tem-
perature limit value
reached, then 2
-
System with inverter, Wattpilot and Ohmpilot
24
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