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Weston, Massachusetts
With above-average energy consumption, this Weston household needed a system large enough to make a meaningful impact on their electricity costs. At rates from Eversource ($0.28/kWh) and National Grid ($0.32/kWh), even a partial offset translates to significant annual savings.
In Massachusetts, solar homeowners can benefit from programs like SMART 3.0 and ConnectedSolutions. Sales tax exempt. Property tax exempt (20 years).
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 17.2 kW system using 42 Q.CELLS Q.PEAK DUO ML-G11+ panels (410W each). Q.CELLS Q.PEAK DUO panels feature half-cut cell technology with excellent anti-degradation performance. Made by Hanwha, they carry a 25-year product warranty and are widely recognized for consistent real-world output.
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.
Equipment Reviews
Massachusetts SMART 3.0 provides $0.03/kWh for 20 years on residential systems up to 25 kW. ConnectedSolutions pays up to $275/kW for battery demand response.
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.
“NuWatt was upfront about the ITC expiring and helped us maximize SMART incentives instead. Our 17 kW system is producing more than projected. The whole process from design to PTO took about 10 weeks.”
Homeowner in Weston, MA
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