Should I Get a Solar Battery Backup in New England? (Honest Pros and Cons)

Battery storage has become one of the most common topics in solar conversations on the South Shore. Homeowners want to know: is it worth it? Do I need it? Will it actually keep my lights on during a storm?

The honest answer is: it depends on what you're trying to accomplish. A battery is a significant additional investment — typically $10,000–$18,000 on top of your solar system — and whether it makes sense for you comes down to your priorities, your electricity usage, and whether you take advantage of programs like ConnectedSolutions.

I'm Dave Simmer, a NABCEP-trained solar designer based in Scituate. I've been having this exact conversation with South Shore homeowners for years. Here's the real breakdown.

What does a solar battery actually do?

A solar battery — the most common options in Massachusetts are the Tesla Powerwall and the Enphase IQ Battery (see Enphase vs. SolarEdge — which is right for your roof?) — stores electricity your solar panels produce during the day. Instead of sending all excess production to the grid immediately, the battery holds it so you can use it later: at night, during cloudy periods, or during a grid outage.

Without a battery, a grid-tied solar system will shut off automatically during a power outage. This is a safety feature — it prevents your panels from back-feeding electricity onto lines that utility workers may be servicing. With a battery, your system can island from the grid and continue powering selected loads in your home even when the grid is down.

The case for getting a battery in New England

Grid reliability and storm outages

If you've lived on the South Shore for more than a few years, you know that grid reliability here is not perfect. Nor'easters, summer thunderstorms, and the occasional ice storm take down power regularly — sometimes for hours, sometimes for days. For homeowners who've lost food in a freezer, lost heat in winter, or dealt with a sump pump failure during a storm, backup power has real practical value.

A battery sized to cover essential loads — refrigerator, some lighting, internet, medical equipment — can meaningfully reduce the impact of outages without requiring a generator and its associated fuel and maintenance costs.

ConnectedSolutions income

This is the factor that most changes the battery math in Massachusetts. ConnectedSolutions is a utility demand response program run by National Grid and Eversource that pays battery owners for allowing the grid to draw on their stored energy during summer peak demand periods. Learn about ConnectedSolutions: how much your battery pays.

This doesn't mean the battery pays for itself on ConnectedSolutions income alone — it doesn't, over a typical 10-year battery lifespan. But it meaningfully shortens the effective payback and makes the overall investment more defensible financially (read about solar battery backup during outages in Massachusetts).

Time-of-use rate management

As Massachusetts utilities move more customers onto time-of-use rate plans — where electricity costs more during peak hours — a battery allows you to avoid drawing expensive peak-hour power from the grid by using stored energy instead. This benefit is most valuable for homes that use significant electricity in the late afternoon and evening.

The case for not getting a battery — yet

Cost and payback

Adding a battery extends your payback period compared to solar alone. If your primary goal is the fastest financial return on your solar investment, a battery works against that goal — at least in the short term. The ConnectedSolutions income helps, but it doesn't fully close the gap for most homeowners.

Net metering already covers most of the "storage" need

Here's something that surprises many homeowners: net metering in Massachusetts already functions as a form of virtual storage. When your panels produce excess electricity during the day, you receive credits. When you draw from the grid at night, those credits offset the cost. You're effectively "storing" value in your utility account.

This means the day-to-night storage benefit of a physical battery is largely already covered by net metering — you're not losing money by sending electricity to the grid during the day without a battery. The battery's additional value is primarily backup power and, in Massachusetts, ConnectedSolutions income.

Battery technology is still evolving

Battery costs have been declining and performance has been improving year over year. Some homeowners reasonably choose to install solar now without a battery and add one later as technology and pricing continue to improve. Adding a battery to an existing solar system is technically straightforward in most cases.

Who should seriously consider a battery?

A battery tends to make the most sense for South Shore homeowners who:

• Have experienced recurring outages and want reliable backup power
• Have medical equipment, sump pumps, or other critical loads that need to stay on
• Are on or moving to a time-of-use rate plan
• Want to maximize energy independence and minimize grid dependence
• Are prepared to enroll in ConnectedSolutions to improve the financial return

Who can probably wait?

A battery is probably not urgent if:

• Your primary goal is the shortest solar payback period
• You have very few outage concerns
• You're on a flat-rate electricity plan with no peak pricing
• Budget is a significant constraint

The bottom line on batteries

In Massachusetts, batteries make more financial sense than in most states — largely because of ConnectedSolutions. But they're still an additional investment that needs to be evaluated against your specific goals, not just added to every system by default (unless you qualify for the Hingham HMLP rebate and Connected Homes program).

I always walk through the battery decision separately from the solar decision. They're related but distinct choices — and the right answer for your neighbor may not be the right answer for you.

Frequently Asked Questions