1.2KW : 250 000/= (generate 140 units, for a house of 220 usage)
1.8KW : 340 000/= (generate 210 units, for a house of 300 usage)
2.4KW : 440 000/= (generate 280 units, for a house of 370 usage)
3.0KW : 550 000/= (generate 350 units, for a house of 430 usage)
4.8KW : 850 000/=...