Let's just crunch the numbers.
Panels - 10 - 100 w panel for a 100 w system. I see larger watt panels are the norm in the market today. and we were paying $3 a watt and selling around $5. I think today, now I see them more like $1.50 to $2 a watt so I would image they are around $3 a watt in the DR today. These are quality panels and not the amorphous materials which have a shorter lifespan. The one we use had a 10 year guarentee and I measured the output of panels 20 years after installation and were still producing electricity at the original rating.
$3000 for the panels
mounting stucture using materials from Aldom, Dominican aluminum in Santiago.
$500
Atleast 12 deep cycle batteries which - Trojan 225 amp hr at around $100 each in the DR
$1,200
Inverter size depends but probably looking at 4000-6000 watts depending on frig and washer sizes
$1,500 - $2,000 for high quality. There are people making inverters in the DR for probably half of that.
Connectors and wires
$300
This is DIY at about $6,500 to $7,000
Installation
$1,000- $1,500 for trained qualified electrictions.
Profit from. the company you are purchasing system.
The takes it up to atleast $10,000.
If I buy amorphous panels or prices have gone down further than I was aware of, a Dominican Inverter and go cheap on the batteries, not sure what the price would be.
The system would produce around 6000 watt hours a day with 1000 watts of panels with approximately 6 hrs a day of good sunlight. This varies somewhat during the winter and summer months and extended cloudy days can impact production but that is why you over design the system by having a bigger battery.
Battery bank will hold 2700 amp hrs (doing math in my head) and we liked to only use 50% on a daily basis and preferably less. Batteries last longer. You could design the system with 6 deep cycles and bring the cost down considerably but usage and storage capacity would be much lower.
Let's make sure where using the information to come to different conclusions.