When I size batteries for systems in Liberia, I always double the quantity of the batteries for days of autonomy. My last system was 48 volts. two sets of 8/6 volts batteries hookup in series and tie together in parallel for higher amps. I also used two XW MPPT.
The information on the type of panel materials are very knowledgeable for me. Thanks.
It is best to have a single string of batteries if you can get the right equipment, but there are many good systems with 2 strings of batteries. It all has to do with what equipment is available and for what price.
Also, be sure to take into consideration that you will only have about half of the energy in a battery that is usable if you are going to have a 50% depth of discharge and you will also have to take into consideration the losses associated with converting electrical to chemical and then back to electrical energy with batteries.
Glad to see students with international experience in this class!! Anyone else that likes to travel, this is a great industry to find jobs abroad.