Efficiency slider for solar PV appears to be outdated

[mabijkerk]

Background
The efficiency slider for solar PV has the following comment in its input:

# This updates the efficiency of solar PV. This affects the output conversion,
# output capacity per panel, and, for energy_power and energy_hydrogen, number of units
# For solar PV farms and solar H2 farms the user sets the installed capacity.
# Since installed capacity is given by the user, a higher efficiency means
# a lower number of units installed. This is achieved reducing the installed NoU.
# For solar panels in households and buildings the user sets the percentage of roof surface covered.
# The installed number of units remain the same.

Issue
The statement "For solar panels in households and buildings the user sets the percentage of roof surface covered." however is outdated, since we no longer set capacity based on roof surface. Looking at the input itself, the number of units is adjusted for most technologies, but not for households_solar_pv_solar_radiation or buildings_solar_pv_solar_radiation.

This may mean that the efficiency is no longer properly updated for households and buildings solar PV.

Solution
We should check this input statement and potentially rewrite it to include households and buildings. We still have the attribute roof surface though, because we show this in a chart. Should this be updated as well in this input?