seems like it's around 0.5-1% of total capacity 😔, but still poggers 
edit from real source https://en.granma.cu/mundo/2025-11-13/chinas-cooperation-with-cuba-in-the-energy-sector-remains-strong-and-steady
The official launch of Mártires de Barbados II was led by the First Secretary of the Party's Central Committee and President of the Republic, Miguel DÃaz-Canel Bermúdez, and it is now connected to the SEN, as are its 5 MW counterparts built in several provinces, with a combined generation capacity of 35 MW. Following the completion of this phase, the second stage, already underway, is expected to be completed by next April and will include 13 5 MW PSFV and two 10 MW PSFV, with a total power of 85 MW and batteries to store 20% of the generation produced.
that would put maximal capacity at 3% which is mega pog 
probably at utilization rates of 1-1.5%, depending on batteries and transmission
i think in case of houses it's fairly reasonable to just bolt them on real tight on tilted roof (where wind either can tear the whole structure off or it can't and panels don't really matter), or make them foldable for flat roofs (which is what cuba has), but idk what is done in this case