about $20,000 if you want to have 2000 度电/month http://www.wholesalesolar.com/ SolarEdge ET Grid-tie Solar System 2,450 watts 2,450/2,213 Not Included** up to 331.95 kWh 10 1 SE3000A -US 1059620 $2.00 $4,902 SolarEdge ET Grid-tie Solar System 3,675 watts 3,675/3,319.5 Not Included** up to 497.93 kWh 15 1 SE3800A-US 1059621 $1.79 $6,562 SolarEdge ET Grid-tie Solar System 4,900 watts 4,900/4,426 Not Included** up to 663.90 kWh 20 1 SE5000A -US 1059622 $1.74 $8,505 SolarEdge ET Grid-tie Solar System 5,880 watts 5,880/5,311.2 Not Included** up to 796.68 kWh 24 1 SE6000A-US 1059623 $1.71 $9,924 SolarEdge ET Grid-tie Solar System 7,350 watts 7,350/6,639 Not Included** up to 995.85 kWh 30 1 SE3000A -US & 1 SE5000A-US 1059662 $1.66 $12,237 SolarEdge ET Grid-tie Solar System 9,800 watts 9,800/8,852 Not Included** up to 1,327.80 kWh 40 2 SE5000A-US 1059624 $1.60 $15,660 SolarEdge ET Grid-tie Solar System 12,250 watts 12,250/11,065 Not Included** up to 1,659.75 kWh 50 2 SE6000A-US 1059625 $1.54 $18,900 SolarEdge ET Grid-tie Solar System 14,700 watts 14,700/13,278 Not Included** up to 1,991.70 kWh 60 3 SE5000A-US 1059626 $1.60 $23,490 SolarEdge ET Grid-tie Solar System 19,600 watts 19,600/17,704 Not Included** up to 2,655.60 kWh 80 3 SE6000A-US 1059627 $1.58 $31,540