PlugIn Solar Guru
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Plug-in solar savings calculator

Your panel size, your sun and your price per kWh decide the answer. Every starting value below is an example to change, not a measurement of any kit.

Add up the nameplate watts of every panel in the kit. 360 W is the most a shared 15 A circuit can safely add, by Bright Saver's math.
Example value. Use a yearly average for your location; winter is lower.
Planning assumption covering angle, shade, heat and inverter losses. A railing that faces east or west is lower.
Power your home is not using at that moment flows out to the grid, and may earn nothing. A fridge and router running all day soak up a small kit.
Divide your bill's total by the kWh it charged for, delivery included.
Leave blank to skip the payback estimate.