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Bar Harbor, Maine
This coastal Maine home faces a double challenge: high electricity costs with rates from CMP ($0.27/kWh) and Versant ($0.32/kWh), and vulnerability to nor’easters and storm-driven power outages. The homeowner needed a system that would both offset daily electricity usage and provide reliable backup power during extended outages.
In Maine, solar homeowners can benefit from programs like 1:1 net billing and Efficiency Maine rebates. Sales tax exempt (5.5%). Property tax exempt (100%, statewide).
Important: The federal residential solar tax credit (Section 25D) expired on December 31, 2025. All savings calculations for this project reflect $0 federal tax credit for homeowner-purchased systems.
We designed a 6.9 kW system using 16 REC Alpha Pure-R 430W panels (431W each). REC Alpha panels offer industry-leading efficiency and one of the strongest warranties in the market (25-year product and performance). Their heterojunction cell technology delivers excellent performance in low-light and high-temperature conditions.
The Enphase IQ8+ microinverters convert DC to AC at each individual panel, maximizing production even when some panels are shaded. Enphase’s panel-level monitoring lets the homeowner track performance of every single panel through the Enphase app. The IQ8 series also supports Sunlight Backup — limited daytime power during grid outages even without a battery.
For energy storage, we installed Enphase IQ Battery 5P. Each IQ Battery 5P provides 5 kWh of usable capacity with a 15-year warranty. The modular design means the homeowner can add more units in the future if their needs grow. The battery integrates seamlessly with the Enphase microinverter ecosystem for unified monitoring.
Equipment Reviews
Maine offers 1:1 retail net billing for rooftop solar. Efficiency Maine provides $1,000-$3,000 per heat pump unit for income-eligible households.
Federal Tax Credit Status: The residential solar tax credit (Section 25D) expired December 31, 2025. Homeowner-purchased systems receive $0 federal tax credit. All savings estimates above are calculated without any federal credit. Third-party owned systems (leases/PPAs) may still benefit from the commercial ITC (Section 48/48E) claimed by the financing company.
“Heating with oil at $3.80+ per gallon, adding solar and a battery was the smartest investment we've made. NuWatt designed a system that works even with our limited winter sun hours.”
Homeowner in Bar Harbor, ME
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