Residential PV Solar system size Calculation


Manual System Sizing Tool
Using the amount monthly kWhs from your utility bill, and the amount of sun hours your location receives, you can find the size of your system, in DC watts, needed to cover 100% of your usage.

Sun Hours
Monthly Usage
< 3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
50kWh
0.7kw
0.6kw
0.5kw
0.5kw
0.4kw
0.4kw
0.3kw
0. kw
100kWh
1.4kw
1.2kw
1.0kw
0.9kw
0.8kw
0.8kw
0.7kw
0.6kw
150kWh
2.0kw
1.7kw
1.5kw
1.4kw
1.2kw
1.2kw
1.0kw
0.9kw
200kWh
2.7kw
2.3 kw
2.0kw
1.8kw
1.6kw
1.6kw
1.4kw
1.2kw
250kWh
3.4kw
2.9kw
2.5kw
2.3kw
2.0kw
2.0kw
1.7kw
1.6kw
300kWh
4.1kw
3.5kw
3.0kw
2.7kw
2.4kw
2.4kw
2.0kw
1.9kw
350kWh
4.7kw
4.1kw
3.5kw
3.2kw
2.8kw
2.8kw
2.4kw
2.2kw
400kWh
5.4kw
4.6kw
4.1kw
3.6kw
3.2kw
3.2kw
2.7kw
2.5kw
450kWh
6.1kw
5.2kw
4.6kw
4.1kw
3.6kw
3.6kw
3.0kw
2.8kw
500kWh
6.8kw
5.8kw
5.1kw
4.5kw
4.1kw
4.1kw
3.4kw
3.1kw
550kWh
7.4kw
6.4kw
5.6kw
5.0kw
4.5kw
4.5kw
3.7kw
3.4kw
600kWh
8.1kw
6.9kw
6.1kw
5.4kw
4.9kw
4.9kw
4.1kw
3.7kw
650kWh
8.8kw
7.5kw
6.6kw
5.9kw
5.3kw
5.3kw
4.4kw
4.1kw
700kWh
9.5kw
8.1kw
7.1kw
6.3kw
5.7kw
5.7kw
4.7kw
4.4kw
750kWh
10.1kw
8.7kw
7.6kw
6.8kw
6.1kw
6.1kw
5.1kw
4.7kw
800kWh
10.8kw
9.3kw
8.1kw
7.2kw
6.5kw
6.5kw
5.4kw
5.0kw
850kWh
11.5kw
9.8kw
8.6kw
7.7kw
6.9kw
6.9kw
5.7kw
5.3kw
900kWh
12.2kw
10.4kw
9.1kw
8.1kw
7.3kw
7.3kw
6.1kw
5.6kw
950kWh
12.8kw
11.0kw
9.6kw
8.6kw
7.7kw
7.7kw
6.4kw
5.9kw
1000kWh
13.5kw
11.6kw
10.1kw
9.0kw
8.1kw
8.1kw
6.8kw
6.2kw
1050kWh
14.2kw
12.2kw
10.6kw
9.5kw
8.5kw
8.5kw
7.1kw
6.5kw
1100kWh
14.9kw
12.7kw
11.1kw
9.9kw
8.9kw
8.9kw
7.4kw
6.9kw
1150kWh
15.5kw
13.3kw
11.6kw
10.4kw
9.3kw
9.3kw
7.8kw
7.2kw
1200kWh
16.2kw
13.9kw
12.2kw
10.8kw
9.7kw
9.7kw
8.1kw
7.5kw
1250kWh
16.9kw
14.5kw
12.7kw
11.3kw
10.1kw
10.1kw
8.4kw
7.8kw
1300kWh
17.6kw
15.0kw
13.2kw
11.7kw
10.5kw
10.5kw
8.8kw
8.1kw
1350kWh
18.2kw
15.6kw
13.7kw
12.2kw
10.9 kw
10.9kw
9.1kw
8.4kw
1400kWh
18.9kw
16.2kw
14.2kw
12.6kw
11.3kw
11.3kw
9.5kw
8.7kw
1450kWh
19.6kw
16.8kw
14. kw
13.1kw
11.7kw
11.7kw
9.8kw
9.0kw
1500kWh
20.3kw
17.4kw
15.2kw
13.5kw
12.2kw
12.2kw
10.1kw
9.3kw
1550kWh
20.9kw
17.9kw
15.7kw
14.0kw
12.6kw
12.6kw
10.5kw
9.7kw


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