Just make sure it is at least 5 KW for every house you plan to connect to it. And make sure the person who installs it is licensed or you could have a problem with the Municipal later!
In my case the whole installation including 3 posts to get the electricity to my lot cost about $3000.
When installing electricity in your home make sure the breaker box is hidden, Ecuadorians will often but the box right in the middle of their living room! Ouch.
Make sure the light switches are just 100-110 cm off the ground so kids can reach them, often in Ecuador if not told the workers will install the sockets too high.
Also, make sure the voltage is 110 for normal sockets and 220 for the oven and AC installations.
Often electricians in Ecuador plan to make most their money on the cables they steal from you! So be very careful with this!
Additionally, most electricians in Ecuador charge per point, or per socket installation. We paid $8-12 per point (or socket).
Often electricians will tell you you need more expensive cable than you really do so they can steal it, careful!
For sockets 12 cable will suffice, for AC or oven 10 cable is ideal.