Payback Guide

Solar + Battery Payback in Massachusetts

Massachusetts has three overlapping incentives for solar + battery: the 30% federal ITC, the SMART production incentive, and the ConnectedSolutions demand-response payment. Combined, they can cut system cost by 50–60%.

Medium confidenceLast checked: April 20254 official sources

Quick answer: A typical 8 kW solar + battery system in Massachusetts costs $38,000–$46,000 installed. After the 30% federal ITC (~$12,000) and 3 years of ConnectedSolutions payments (~$4,500–$10,500), net cost drops to $18,000–$27,000 with a simple payback of 8–14 years. Solar-only payback is shorter at 7–12 years.

Payback scenarios

8 kW solar + 13 kWh battery (Powerwall)

System cost

$38,000–$46,000

Federal ITC (30%)

$11,400–$13,800

ConnectedSolutions/yr

$1,500–$3,500/yr

Net cost (after 3 yrs)

$18,000–$27,000

Simple payback

8–14 years

Best for homes with high electricity usage, time-of-use rates, or frequent outages.

8 kW solar only (no battery)

System cost

$22,000–$32,000

Federal ITC (30%)

$6,600–$9,600

ConnectedSolutions/yr

N/A

Net cost (after 3 yrs)

$15,000–$23,000

Simple payback

7–12 years

Simpler installation, shorter payback. Better if backup power is not a priority.

Battery only (no solar)

System cost

$12,000–$18,000

Federal ITC (30%)

$3,600–$5,400

ConnectedSolutions/yr

$1,500–$3,500/yr

Net cost (after 3 yrs)

$2,000–$9,000

Simple payback

5–10 years

Qualifies for 30% ITC as standalone (post-2023). ConnectedSolutions payments accelerate payback significantly.

What moves the numbers most

SMART incentive rate

The SMART program rate varies by utility and fills up in tranches. If you're in an active tranche, it adds meaningful value. If capacity is exhausted at your utility, the payback calculation shifts.

Net metering vs net billing

Most MA utilities now use net billing (lower rate than retail for excess export). The higher your self-consumption ratio (using power you generate), the better your payback — batteries help here.

ConnectedSolutions enrollment

ConnectedSolutions payments are not guaranteed every year — the utility determines payment rates annually. Model conservatively; actual payments have ranged from $1,200 to $4,000+ per year.

Battery adds backup value beyond ROI

Payback calculations don't capture backup value. If you have medical equipment, a well pump, or simply want outage protection, battery adds non-financial value that matters to the decision.

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