Solar System Sizing Tool — Portland, ME
Use our interactive tool to determine the right solar system size for your home in Portland. Adjust your monthly electricity bill and home size to see a personalized recommendation based on local solar conditions.
Size Your Solar System
$
Local rate: 22.8¢/kWh
ft
Peak sun hours: 4.1h/day
5.6
System Size (kW)
14
Panels Needed
252
Roof Space (sq ft)
$15,837
Est. Cost
8,316
Annual kWh
100%
Energy Offset
Energy Offset100% of your usage covered by solar
0%50%100%
How We Calculate Your System Size
Your recommended solar system size is based on several factors specific to Portland, ME:
- Electricity usage: Your monthly bill is converted to annual kWh consumption using the local rate of 22.8¢/kWh.
- Solar irradiance: Portland receives an average of 4.1 peak sun hours per day, which determines how much energy each panel produces.
- Panel specifications: We use 400W panels, each requiring approximately 18 sq ft of roof space, which is standard for modern residential installations.
- Roof space: The total roof area needed depends on the number of panels. The average home in Portland is 1,600 sq ft.
Solar at a Glance: Portland, ME
22.8¢
Avg Rate / kWh
4.1h
Peak Sun Hours / Day
5.6 kW
Avg Recommended Size
14
Avg Panels Needed
$15,837
Est. Cost (before incentives)
Central Maine Power
Utility Provider
Other Cities in Maine
Related Resources
Ready to Go Solar in Portland, ME?
Get a Custom Solar Design for Portland
Our experts will assess your roof, energy needs, and local conditions to design the perfect system for your Portland home.
Get Your Free Quote