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Belmont, Massachusetts
This Belmont homeowner wanted more than just lower electricity bills. With rates from Eversource ($0.28/kWh) and National Grid ($0.32/kWh), the economics of solar were compelling — but the real driver was energy independence and backup power. After experiencing grid outages, having reliable backup became a priority.
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 18 kW system using 41 Silfab Elite SIL-440-BG panels (439W each). Silfab Elite panels are manufactured in North America (Washington state and Ontario) and qualify as FEOC-compliant domestic content. They offer excellent efficiency, a 30-year warranty, and strong performance in varying weather conditions.
The Enphase IQ8M 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 3× 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
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.
“Triple battery setup gives us real energy independence. ConnectedSolutions payments are a nice bonus on top of the SMART income. NuWatt made the whole enrollment process simple.”
Homeowner in Belmont, MA
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