Thanks for your explanation, my mains AC voltage is 230v 50Hz.
About system voltage, they say there is a thumb rule that for every 1000watt we have to switch to a higher volt system.
0-1000w - 12v
1000 - 2000w - 24v
2000- 4000w - 48v
I saw this on google, just confirming it here again. And they say higher volt system is more efficient and uses thin cables and less to no voltage drop, i have no idea what that means but it looks something i would like to be aware of.
Yes,
There are practical aspects to consider with power systems, but the power of the system is constant. Thus taking a 3,600 watt solar installation at different voltages the currents would be:
(1) 12V system, current = 3,600 Watts/12V = 300 Amps
(2) 24V system, current = 3,600 Watts/24V = 150 Amps
(3) 36V system, current = 3,600 Watts/36V = 100 Amps
(4) 48V system, current = 3,600 Watts/48V = 75 Amps
(5) 60V system, current = 3,600 Watts/60V = 60 Amps
(6) 72V system, current = 3,600 Watts/72V = 50 Amps
(7) 84V system, current = 3,600 Watts/84V = 42.86 Amps
(8) 96V system, current = 3,600 Watts/96V = 37.5 Amps
As you can see, the 12V system would be fraught with problems due to the high current involved: can you imagine how thick the cables to carry the current would be. Also controlling that much current would be very difficult, inefficient, and expensive. One of the main problems is the voltage drops caused by cable resistance and contact resistance due to such a high current.
On the other hand, the current of the 96V solar system would be quite manageable.
Incidentally, this principle of reducing the current and increasing the voltage to increase efficiency, is why national grids operate at such unbelievably high voltages of up to 400,000 Volts in the UK for example.
spec
PS: as you still have not told us where you are, note that in the UK, a comma in a number is a separator not a decimal point, as is the case in some countries.