Exactly right - solar is only a charger device to recharge the batteries. It's the battery output that then provides power to the Inverter.
2- Cost of electricity, yes even in DR, cost of energy is not as high as cost per watt of solar panels. Example.
You have a 3.6 KW inverter, That's the maximum continuous capacity, not necessarily what you consume. For the example I will bring that down to 1.2KW that's 28.8KW day or 864 KW month on the light bill or ~$7,732.00 pesos month.
yes but that 3.6 KW / 3600 watts is a maximum output rating of the inverter while being used; NOT the amount of battery power the inverter consumes; the inverter will provide that constant level of wattage until the battery charge is depleted. It's now that cost comes into play - the cost of power to recharge the battery. Either recharge via AC voltage (via the inverter when AC power is available) or some DC method ( wind generator or solar cells ). I definitely agree on financials - the cost of the solar panels are very expensive but a one time outlay - vs the continuous outlay for AC power. but i thought your example kinds of misleads a bit - your example is if you are recharging those batteries 24 hours a day / 7 days a week.
In the DR you have about 4.5 hours of efficient solar radiation for the panels to convert to energy. That's 28.8KW/4.5 = 6.4KW per hour you need to produce. A big solar panel will output about 180 - 190 watts and cost is about $700.00 - $800.00 plus shipping plus tax. Then 6,400 / 180 = 35.5. You will need 36 solar panels and have no need to use EdeEste, EdeSur or EdeNorte. But you will need $25,200 American Dollars or 882,000 pesos, plus shipping and import taxes.
3- The graph and number represent the maximum power under maximum temperature. The Breakdown voltage, the open voltage etc.
4- Unless you have a big, apartment you don't have the space to put it. The solar panels must point to the south.
5- Think about the following, If you are not Dominican ask any of your friends back home if they know what an inverter is. Ask them if the know what's the peak power of their homes, etc. Dominican know how to make inverters, batteries because it's a way to survive the long ending crisis they have. Yes you will find dumb Dominicans that will burn the inverter but you will also find that in any part of the world. The DR is the place to promote Inverters World Wide, They have more inverters per each head ( Per Capita ) than any place in the world, that's a fact.