If I use about 1,500 kWh a month, what size solar system should I get to offset my usage?

1 kW System Production kWh/yr: 1,350
kWh Monthly Electric Consumption: 1,500

 1,500 * 12 (no. of months in a yr) =  18,000
 18,000/1,350  13.33
 Total kW needed  13.33

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