Remove the static icon, as the device_class already defines a icon in HA

[mnederlof]

Looks way better with different icons based on the device class.

[mnederlof]

If we want to be accurate for the DC current, we'd use mdi:current-dc, but there is nothing for DC voltage..

Just specify DC current like this in const.py (note the icon parameter):

    SensorEntityDescription(
        key="inverters_dc_current",
        name="DC Current",
        icon="mdi:current-dc",
        native_unit_of_measurement=UnitOfElectricCurrent.AMPERE,
        state_class=SensorStateClass.MEASUREMENT,
        device_class=SensorDeviceClass.CURRENT,
    ),