2026 Massachusetts Solar ROI & Electric Rate Breakdown by County (14 Counties)
MA Net Metering (100% credit for systems ≤10kW AC) + SMART Program + ConnectedSolutions Battery Payouts ($275/kW/summer). Mass. Gen. Laws ch. 59 § 5(45) provides a 100% 20-Year Property Tax Exemption + 100% Sales Tax Exemption + $1,000 MA State Solar Tax Credit.
| County | Primary Electric Utility | Avg Rate ($/kWh) | Peak Sun Hours | Est. Yr-1 Savings | Cash Payback | County Teardown |
|---|---|---|---|---|---|---|
| Middlesex County | Eversource / National Grid MA | $0.34/kWh | 4.4 hrs/day | $4,042/yr | 7.4 yrs | View Math → |
| Worcester County | National Grid MA | $0.34/kWh | 4.4 hrs/day | $3,960/yr | 7.5 yrs | View Math → |
| Essex County | National Grid MA / Peabody & Danvers Municipal | $0.33/kWh | 4.4 hrs/day | $3,924/yr | 7.6 yrs | View Math → |
| Suffolk County | Eversource (Boston) | $0.35/kWh | 4.4 hrs/day | $4,113/yr | 7.2 yrs | View Math → |
| Norfolk County | Eversource / National Grid MA | $0.34/kWh | 4.4 hrs/day | $4,066/yr | 7.3 yrs | View Math → |
| Bristol County | Eversource / National Grid MA / Taunton MLP | $0.34/kWh | 4.5 hrs/day | $4,086/yr | 7.3 yrs | View Math → |
| Plymouth County | Eversource / National Grid MA | $0.34/kWh | 4.5 hrs/day | $4,134/yr | 7.2 yrs | View Math → |
| Hampden County | Eversource / Chicopee & Holyoke Municipal | $0.33/kWh | 4.4 hrs/day | $3,853/yr | 7.7 yrs | View Math → |
| Barnstable County (Cape Cod) | Eversource (Cape Light Compact) | $0.35/kWh | 4.5 hrs/day | $4,255/yr | 7 yrs | View Math → |
| Hampshire County | National Grid MA / Eversource | $0.34/kWh | 4.4 hrs/day | $3,972/yr | 7.5 yrs | View Math → |
| Berkshire County | Eversource / National Grid MA | $0.33/kWh | 4.3 hrs/day | $3,858/yr | 7.7 yrs | View Math → |
| Franklin County | Eversource / National Grid MA | $0.33/kWh | 4.3 hrs/day | $3,858/yr | 7.7 yrs | View Math → |
| Dukes County (Marthas Vineyard) | Eversource | $0.36/kWh | 4.5 hrs/day | $4,304/yr | 6.9 yrs | View Math → |
| Nantucket County | National Grid MA | $0.35/kWh | 4.5 hrs/day | $4,292/yr | 6.9 yrs | View Math → |
Recommended Home Battery & Hybrid Inverter Kits for Massachusetts
Turnkey solar salespeople routinely charge $3.60–$4.80/W by bundling 30% loan dealer fees and $12,000+ battery margins. Buying Tier-1 UL9540 hardware directly—either DIY or hiring a local licensed electrician ($1,500–$2,500)—cuts total cost by 50–65%.
EG4 18kPV Inverter + 14.3kWh PowerPro WallMount
The gold-standard UL9540 all-in-one hybrid system. Pair an 18kW PV input hybrid inverter (200A pass-through) with an indoor/outdoor IP65 14.3kWh LiFePO4 WallMount battery—saving $12,000+ vs turnkey quotes.
- 18kW PV Input / 12kW Continuous AC Output (200A Pass-Through)
- 14.3kWh LiFePO4 (8,000+ cycles @ 80% DoD)
- UL9540 & UL1741-SB Certified for Permit Approval
EcoFlow Delta Pro Ultra (6kWh–30kWh Modular)
Skip the $30,000 contractor quote and 6-month utility interconnection wait. Delivers 7.2kW–21.6kW continuous 120V/240V split-phase output and 5.6kW Solar Input right out of the box—expandable up to 90kWh.
- 7,200W–21,600W 120V/240V Split-Phase Output
- 6.1kWh LFP Stackable Battery (scales to 30kWh–90kWh)
- 5,600W Solar Input — Zero Roof Permit Required for Portable PV
Renogy 48V Off-Grid & Hybrid LFP Solar Kit
Complete modular 48V architecture combining high-efficiency N-type bifacial panels, a 48V 3,500W–5,000W MPPT inverter-charger, and smart modular LiFePO4 storage at ~$1.15/W hardware cost.
- 48V High-Efficiency Bus (75% lower copper wire loss)
- Modular 48V 50Ah / 100Ah Smart LiFePO4 Battery Bank
- Complete Plug-and-Play MPPT All-in-One Controller
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