Loading NuWatt Energy...
We use your location to provide localized solar offers and incentives.
We serve MA, NH, CT, RI, ME, VT, NJ, PA, and TX
Loading NuWatt Energy...
NuWatt designs, installs, and manages solar, battery, heat pump, and EV charger systems across 9 states. One company, one warranty, one point of contact.
Get a Free Quote
New England averages 8-12 power outages per year. A home battery keeps your heat pump, refrigerator, and WiFi running when the grid goes down. Here's how to size, choose, and pay for one.
Quick Answer
A 13.5 kWh battery (Tesla Powerwall 3) powers essential loads — heat pump, refrigerator, lights, WiFi — for 12-24 hours during an outage. Paired with solar panels, it can run indefinitely, recharging each day. Cost: $12,000-$16,000 installed. No federal tax credit in 2026 (Section 25D expired), but state programs like ConnectedSolutions (MA, RI, CT) earn $1,000-$1,500/year while you wait for outages.
New England's aging grid infrastructure, heavy tree cover, and severe weather create one of the least reliable power grids in the country. From nor'easters and ice storms to summer thunderstorms, outages are a fact of life.
| State | Outages/Year | Avg Duration | Worst Recent Event | Risk Level |
|---|---|---|---|---|
| Maine | 10-14 | 6.2 hrs | Dec 2024 ice storm (5 days) | High |
| New Hampshire | 10-14 | 5.8 hrs | Dec 2022 nor'easter (4 days) | High |
| Vermont | 8-12 | 5.5 hrs | Dec 2022 ice storm (3 days) | High |
| Massachusetts | 6-10 | 4.2 hrs | Oct 2021 nor'easter (3 days) | Medium |
| Connecticut | 6-10 | 4.8 hrs | Aug 2020 Tropical Storm Isaias (8 days) | Medium |
| Rhode Island | 6-8 | 3.8 hrs | Oct 2021 nor'easter (2 days) | Medium |
27+
Major nor'easters since 2015
4-8 hrs
Average outage duration in NE
5+ days
Worst-case outages (ice storms)
A single home battery excels at running essential loads. Understanding what draws how much power helps you choose the right battery size.
Heat pump (mini-split) (1,000-2,500W)
Keeps home warm in winter
Refrigerator/freezer (150-400W)
Prevents food spoilage
LED lights (10 bulbs) (100W total)
Whole-home lighting
WiFi router + modem (20-30W)
Internet for work/communication
Phone/laptop charging (50-100W)
Stay connected
Sump pump (500-1,000W)
Prevents basement flooding
Garage door opener (500W (brief))
Entry/exit during outage
Medical devices (CPAP, O2) (30-150W)
Life safety
Electric range/oven (3,000-5,000W)
A single cooking session can drain 20-40% of a battery
Clothes dryer (electric) (4,000-5,500W)
One of the highest draws in any home
Central AC (3-5 ton) (3,500-6,000W)
Running continuously will drain a battery in 2-4 hours
Electric water heater (4,000-5,500W)
Intermittent, but high draw when heating
Pool pump (1,500-2,500W)
Not critical during an outage
EV charger (Level 2) (7,200-9,600W)
Requires its own battery-scale power
Key insight: You can run these loads on a battery — just not simultaneously, and not for extended periods. The Powerwall 3's 11.5 kW output handles any single appliance. The issue is total energy (kWh), not instantaneous power.
Most New England homes need 3-5 kW of continuous power for essentials. Whole-home backup requires 11+ kW. Here's how to think about sizing.
Dedicated subpanel with critical circuits
3-5 kW continuous
One Powerwall 3 or Enphase IQ 10C = 12-24 hours
Entire electrical panel powered
8-15 kW continuous
Powerwall 3 (11.5 kW) or Franklin aPower2 (10 kW + expandable)
Select the appliances you want to keep running during an outage. The calculator shows your total power draw and how long each battery would last.
Total load
1.9 kW (1,900W)
Tesla Powerwall 3
13.5 kWh | 11.5 kW max
7.1 hours
Enphase IQ 5P
5 kWh | 3.84 kW max
2.6 hours
Enphase IQ 10C
10.08 kWh | 3.84 kW max
5.3 hours
Franklin aPower2
20 kWh | 10 kW max
10.5 hours
Four batteries dominate the New England residential market. Each has different strengths for outage backup.
| Battery | Capacity | Continuous Output | Peak Output | Installed Cost | Best For |
|---|---|---|---|---|---|
| Tesla Powerwall 3Top Pick | 13.5 kWh | 11.5 kW | 12.5 kW | $13,500-$15,000 | Whole-home backup, heat pump support |
| Enphase IQ Battery 5P | 5.0 kWh | 3.84 kW | 5.76 kW | $8,500-$9,500 | Essential loads, small homes, budget-friendly |
| Enphase IQ Battery 10C | 10.08 kWh | 3.84 kW | 5.76 kW | $12,000-$13,500 | Extended essential backup, Enphase ecosystems |
| Franklin aPower2 | 20.0 kWh | 10.0 kW | 15.0 kW | $15,000-$17,000 | Maximum capacity, multi-day outages |
See detailed reviews: Tesla Powerwall 3 | Enphase IQ 5P | Enphase IQ 10C | Franklin aPower2
A battery alone provides hours of backup. Add solar panels, and the battery recharges each day — enabling indefinite backup during multi-day outages.
Battery kicks in instantly (<20ms). Solar panels recharge the battery during daylight. Evening draws from stored energy.
Solar recharges the battery to ~80-100% each sunny day. Even cloudy New England winter days produce 30-50% of rated output — enough for essentials.
Your home keeps running. Heat pump maintains comfortable temperature. Food stays fresh. WiFi stays on. You continue working from home while the grid is repaired.
Real example: A 7 kW solar system paired with a 13.5 kWh Powerwall in Portland, ME produced an average of 15-20 kWh/day in January 2026 — more than enough to cover 10-15 kWh of essential loads and recharge the battery each day.
In Massachusetts, Rhode Island, and Connecticut, the ConnectedSolutions demand response program pays you to let your battery discharge during summer grid peaks. Your battery earns money when the power is ON, and protects you when it goes OFF.
The math: A $14,000 Powerwall 3 earning $1,300/year from ConnectedSolutions has a program-funded payback of ~10.8 years — within the 15-year battery warranty. Factor in outage protection value and TOU arbitrage, and the effective payback drops to 7-9 years.
Home battery prices have stabilized in 2026. There is no federal tax credit for homeowner-purchased batteries (Section 25D expired December 31, 2025). State incentives vary.
Section 25D: Expired
The residential clean energy tax credit expired December 31, 2025. Homeowners who purchase a battery with cash or a loan receive $0 in federal tax credit.
Exception: Batteries installed through a third-party-owned arrangement (solar lease/PPA) may still qualify under Section 48/48E — the leasing company claims the credit, which may lower your monthly payment.
A single 13.5 kWh battery (like the Tesla Powerwall 3) powers essential loads — refrigerator, heat pump, lights, WiFi, and phone charging — for 12-24 hours depending on usage. A larger 20 kWh battery (Franklin aPower2) can extend that further. Paired with solar panels, a battery recharges during daylight and can provide indefinite backup during multi-day outages.
Yes, but sizing matters. A mini-split heat pump draws 1-3 kW depending on mode. A single Powerwall (11.5 kW continuous output) can easily handle a mini-split plus other essentials. A central ducted heat pump draws 3-5 kW and may require a larger battery system. The Tesla Powerwall 3 at 11.5 kW continuous is the best option for whole-home heat pump backup.
No. A battery works independently as backup power — it charges from the grid during normal operation and discharges during an outage. However, without solar, the battery eventually depletes and cannot recharge until grid power returns. With solar panels, the battery recharges each day, enabling indefinite backup during extended outages.
No. The residential clean energy tax credit (Section 25D) expired December 31, 2025. Homeowners who purchase a battery with cash or a loan receive $0 in federal tax credit. However, state programs like ConnectedSolutions (MA, RI, CT) can offset $1,000-$1,500/year in revenue, and some states offer direct battery rebates.
A single-battery system costs $12,000-$16,000 installed, depending on the battery model and electrical work required. The Tesla Powerwall 3 typically costs $13,500-$15,000 installed. The Enphase IQ Battery 5P (smaller, 5 kWh) costs $8,500-$9,500. Multi-battery installations get per-unit discounts of $500-$1,000 per additional unit.
Essential backup powers a dedicated subpanel with your most critical circuits — typically refrigerator, heat pump, lights, WiFi router, and a few outlets. It uses 3-5 kW and one battery lasts longer. Whole-home backup powers your entire electrical panel, including high-draw appliances like electric ranges and dryers. It requires a battery with 11.5+ kW output (Powerwall 3) and drains faster.
Yes. In Massachusetts, Rhode Island, and Connecticut, the ConnectedSolutions demand response program pays $225-$275 per kW of battery capacity per summer season. A single Powerwall earns roughly $1,000-$1,500/year. The battery automatically discharges during grid peak events (you set a minimum reserve for backup). This revenue typically covers 7-12% of the battery cost annually.
Batteries are silent, require no fuel, start instantly (under 20 milliseconds), and need zero maintenance. Generators are cheaper upfront ($3,000-$8,000 for a whole-home Generac) but require fuel, regular maintenance, produce carbon monoxide, and take 10-30 seconds to start. Batteries are better for frequent short outages; generators may be better for rare multi-day outages without solar.
Get a custom battery sizing recommendation based on your home's loads, solar system, and outage history. Free assessment, no pressure.