Hi Maya,
The Yield variable expects only to see a quantity of energy available per year. If you wish to provide LEAP with kWh/m2/year, then you would also need to multiply this by the total area. For the sake of transparency, you may do this directly in LEAP's expressions:
(energy per area, per year) * (area available)
You might find it useful to store the area in a separate
user-defined variable, which you can refer to in your multiplication calculation.
Hope this helps,
Taylor