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...
Do not let winter storms leave you in the dark. Learn how to size a battery backup system, compare the top battery options, and understand how solar keeps your home powered even when the grid goes down.
13.5 kWh
Powerwall 3
60-85%
Winter Solar Output
$275/kW
ConnectedSolutions
12-24 hrs
Critical Load Runtime
A 13.5 kWh battery (Tesla Powerwall 3 or Franklin WH) powers critical loads — furnace blower, refrigerator, internet, lights — for 12-24 hours during a winter outage. Paired with solar, the battery recharges during daylight for potentially indefinite critical-load backup. Solar produces 60-70% of summer output in New England winters, 80%+ in Texas. In Massachusetts, ConnectedSolutions pays $225-$275/kW annually, making your battery earn $2,000-$3,500/year in demand response revenue. A SPAN smart panel manages load priority automatically during outages.
Winter power outages are not just inconvenient — they are dangerous. With more extreme weather events, aging grid infrastructure, and increased dependence on electricity for heating and remote work, backup power is no longer optional.
Even gas furnaces need electricity for the blower motor and thermostat. Without power, your heating system shuts down completely. In sub-freezing temperatures, pipes can freeze within 4-6 hours, causing thousands of dollars in damage.
Winter storms are becoming more intense. The 2024 New England ice storm left 500,000+ without power for up to 7 days. Texas Winter Storm Uri (2021) caused 4+ day outages and an estimated $195 billion in damage statewide.
30%+ of workers are now remote or hybrid. A winter outage means lost income, missed meetings, and potential job consequences. Battery backup keeps your internet, computer, and phone charged throughout an outage.
CPAP machines, oxygen concentrators, nebulizers, and electric wheelchair chargers all require power. For medically dependent households, battery backup is not a convenience — it is a safety necessity.
A refrigerator keeps food safe for about 4 hours without power (if the door stays closed). A freezer lasts 24-48 hours if full, less if half-full. Battery backup prevents hundreds of dollars in spoiled food per outage.
The US power grid averages 5.6 outage hours per customer per year — the worst among developed nations. Winter accounts for 35% of major outage events. The grid is not getting more reliable; your backup plan needs to.
Not all batteries are created equal for winter backup. Here is an honest comparison of the four leading home battery systems, with a focus on what matters most during outages.
Capacity
13.5 kWh
Output
11.5 kW continuous
Price
$8,500-$12,000
Warranty
10 years
Best for: Whole-home backup, high-power loads
Capacity
5 kWh per unit
Output
3.84 kW per unit
Price
$5,000-$7,000 per unit
Warranty
15 years
Best for: Modular scaling, Enphase solar systems
Capacity
13.6 kWh
Output
10 kW continuous
Price
$9,000-$13,000
Warranty
12 years
Best for: Whole-home backup, inverter-agnostic
Capacity
9-18 kWh (modular)
Output
9 kW continuous
Price
$10,000-$18,000
Warranty
10 years
Best for: Generator backup users transitioning to battery
A common misconception is that solar panels do not produce enough energy in winter to be useful. The reality is more nuanced and more encouraging than most people think.
Winter Output Is Real
Solar panels produce 60-70% of their summer output in New England winters and 80-85% in Texas. Cold temperatures actually improve panel efficiency — panels are rated at 25 degrees C, and winter temperatures mean higher conversion rates.
Battery Recharging During Outages
During a grid outage, solar panels continue producing and charging your battery (with a battery-compatible inverter). Even on cloudy winter days, a 10 kW system can produce 2-4 kW — enough to run critical loads and partially recharge the battery for overnight use.
Snow Management
Panels installed at 30+ degrees typically self-clear snow within 1-2 days. The dark surface absorbs heat and accelerates melt. Heavy snow may require manual clearing with a roof rake (never climb on a snowy roof).
Shorter Days, Higher Value
Winter days are shorter (9-10 hours vs 14-15 hours), but electricity rates are often higher in winter due to heating demand. Each kWh your solar produces in winter is worth more in dollar terms.
Percentage of summer peak output. Based on 30-year NREL data.
Setup: 10 kW solar + 13.5 kWh Powerwall 3 + SPAN panel
With solar recharging, critical-load backup can last indefinitely.
A SPAN smart panel or built-in battery management system automatically prioritizes your most important circuits during an outage. Here is the typical priority hierarchy:
Runtime estimates based on a single 13.5 kWh battery powering each load individually.
| Priority | Load | Power Draw | Runtime (13.5 kWh) |
|---|---|---|---|
| Critical | Heating System (gas furnace blower) | 400-600W | 8-12 hrs on 13.5 kWh |
| Critical | Refrigerator/Freezer | 100-200W | 24+ hrs on 13.5 kWh |
| Critical | Medical Equipment (CPAP, O2) | 50-150W | 24+ hrs on 13.5 kWh |
| Critical | Internet Router + Modem | 20-40W | 24+ hrs on 13.5 kWh |
| Important | LED Lighting (10 fixtures) | 100-150W | 12-18 hrs on 13.5 kWh |
| Important | Phone/Laptop Charging | 50-100W | 24+ hrs on 13.5 kWh |
| Important | Sump Pump | 500-1,000W | 4-8 hrs on 13.5 kWh |
| Optional | Electric Space Heater | 1,500W | 2-4 hrs on 13.5 kWh |
| Important | Heat Pump (mini-split) | 1,200-2,000W | 3-6 hrs on 13.5 kWh |
| Optional | Electric Oven/Range | 2,000-5,000W | 1-3 hrs on 13.5 kWh |
SPAN replaces your traditional breaker panel with a smart panel that monitors and controls every circuit individually. During an outage, SPAN automatically sheds non-essential loads to extend battery runtime. You can adjust priorities from your phone in real time.
Auto-Shedding
Non-essential circuits turn off automatically when battery drops below thresholds
Real-Time Monitoring
See exactly which circuits are drawing power and how much battery remains
Remote Control
Turn circuits on/off from your phone, even during an outage (via local WiFi)
In Massachusetts and Rhode Island, your battery can earn $2,000-$3,500 per year through utility demand response programs. The battery discharges during peak summer demand events (typically 10-20 events per summer, 2-3 hours each) and the utility pays you for the grid relief. This revenue offsets your winter backup investment.
| Utility | Summer Rate | Winter Rate | Est. Annual Revenue | Note |
|---|---|---|---|---|
| Eversource (MA) | $275/kW | $50/kW | ~$3,588 (for 2x Powerwall) | Highest payout in New England |
| National Grid (MA) | $225/kW | $50/kW | ~$3,025 (for 2x Powerwall) | Strong program, good participation rates |
| Rhode Island Energy | $225/kW | $50/kW | ~$3,025 (for 2x Powerwall) | Available statewide in RI |
Powerwall 3 Installed Cost
~$12,000
Annual ConnectedSolutions (Eversource)
~$3,588/yr
Payback Period
~3.3 years
After payback, your battery continues earning $3,000+/year while providing winter backup protection. Over a 10-year warranty period, total revenue could exceed $30,000 on a $12,000 investment.
Winter outage risk varies dramatically by region. Understanding your area's specific threats helps you size the right battery backup system.
Threats: Nor'easters, ice storms, heavy snow on lines
Avg outage: 6-18 hours
Worst case: 3-7 days (2024 ice storm)
Winter solar: 60-70% of summer output
Threats: Freeze events, ERCOT grid failures, ice
Avg outage: 12-72 hours
Worst case: 4+ days (Winter Storm Uri 2021)
Winter solar: 80-85% of summer output
Threats: Ice storms, coastal storms, nor'easters
Avg outage: 4-12 hours
Worst case: 2-5 days (major ice events)
Winter solar: 65-75% of summer output
Threats: Ice storms, polar vortex, heavy snow
Avg outage: 4-8 hours
Worst case: 2-4 days (polar vortex events)
Winter solar: 55-65% of summer output
The federal residential tax credit (Section 25D) expired December 31, 2025. Homeowners buying batteries with cash or a loan receive $0 in federal tax credits.
However, Section 48/48E allows third-party financing companies to claim 30%+ ITC on solar+battery systems where construction begins before July 4, 2026. This includes:
The 30% base credit can stack: +10% domestic content, +10% energy community, +10-20% low-income — up to 70% total. The financing company passes savings through as lower monthly payments for the homeowner.
10 kW Solar + Powerwall 3
$38,000
Installed cost (cash/loan price)
Section 48 ITC (30% base)
-$11,400
Claimed by TPO financing company
FEOC Domestic Content (+10%)
-$3,800
With Silfab FEOC-compliant panels
Net Cost to Financing Co.
$22,800
Passed through as lower buyer payments
Some solar companies lock you into one battery brand, one financing option, and one-size-fits-all system design. NuWatt takes a different approach: we help you choose the right equipment for your specific winter backup needs.
| Feature | NuWatt Energy | National Solar Co. |
|---|---|---|
| Equipment Choice | Tesla Powerwall 3, Enphase IQ 5P, Franklin WH, Generac — you choose what fits your home | Locked to one manufacturer (typically proprietary or rebranded) |
| Smart Panel Integration | SPAN smart panel for circuit-level load management and monitoring | Basic subpanel or no smart load management |
| Financing Options | Cash, loan, Section 48 TPO, Propel ($0 down in ME/TX) | Typically lease/PPA only, or inflated loan rates |
| System Design | Custom-sized to your winter load profile and critical circuits | One-size-fits-all, often oversized or undersized |
| Service & Warranty | Local crew, same-day service calls, direct communication | 1-800 number, ticket system, weeks for service |
| ConnectedSolutions | Enrolled at install, annual revenue from day one | Often not enrolled or customer must self-enroll |
Generators have been the traditional backup solution. Batteries are the modern alternative. Here is an honest look at when each makes sense.
Cost: $8,500-$12,000 installed
Annual maintenance: $0
Annual revenue (MA): $2,000-$3,500
Cost: $10,000-$20,000 installed
Annual maintenance: $300-$500
Annual revenue: $0
Everything you need to know about winter battery backup and solar.
A 13.5 kWh battery (like Tesla Powerwall 3) can power critical loads — furnace blower, refrigerator, internet, lights, and phone charging — for 12-24 hours depending on usage. If paired with solar, the battery recharges during daylight hours, potentially providing indefinite backup for essential loads. Running a heat pump or electric heater drains the battery much faster (3-6 hours). SPAN or built-in battery management prioritizes critical circuits automatically.
Yes, but at reduced capacity. Solar panels produce 60-70% of their summer output in New England winters and 80-85% in Texas. During a storm with heavy cloud cover, production drops to 10-30% of rated capacity. However, even reduced production extends battery runtime significantly. A 10 kW solar array producing at 20% capacity generates 2 kW — enough to keep critical loads running and slowly recharge the battery.
Most homeowners are best served by critical-load backup, which covers heating, refrigeration, internet, medical equipment, and essential lighting. Whole-home backup requires 2-3 batteries ($17,000-$36,000) and is typically only necessary if you have a home office, medical equipment, or electric heating as your sole heat source. A SPAN smart panel lets you dynamically manage which circuits get power, giving you flexibility without the cost of whole-home backup.
For most homeowners, yes. Batteries are silent, require zero maintenance, produce no carbon monoxide, start instantly during outages, and can earn revenue through demand response programs (ConnectedSolutions pays $225-$275/kW in MA). Generators require fuel storage, regular maintenance, manual start (unless auto-start), and produce exhaust. However, generators can run indefinitely with fuel and provide higher sustained power. Some homeowners pair a small generator with a battery for extended outages.
Natural gas generators have the advantage of unlimited fuel (connected to gas line) and high power output (20+ kW). However, they cost $10,000-$20,000 installed, require annual maintenance ($300-$500), produce noise and emissions, and generate zero revenue. A battery system costs $8,500-$12,000, earns $2,000-$3,500/year through ConnectedSolutions (in MA), requires zero maintenance, and provides instant silent backup. The battery typically pays for itself in 3-5 years through demand response revenue alone.
SPAN replaces your traditional electrical panel with a smart panel that monitors and controls every circuit individually. During a power outage, SPAN automatically prioritizes critical loads (heating, refrigeration, medical, internet) and can shed non-essential circuits (EV charger, pool pump, dryer) to extend battery runtime. You control priorities through the SPAN app and can adjust in real time. SPAN also provides detailed energy monitoring 24/7.
Yes. Battery retrofit is one of our most common installations. If you have a string inverter system, you will likely add a hybrid inverter (like the one built into Powerwall 3 or Franklin WH) or an AC-coupled battery. If you have Enphase microinverters, the Enphase IQ Battery 5P integrates seamlessly. NuWatt handles the permitting, electrical work, and utility interconnection for battery additions.
Yes. Under Section 48/48E, battery storage qualifies for the Investment Tax Credit when installed as part of a solar-plus-storage system. The third-party financing company (not the homeowner) claims the 30%+ ITC on projects beginning construction before July 4, 2026. This applies to both new solar+battery installations and battery additions to existing solar systems through TPO financing. The residential ITC (Section 25D) expired December 31, 2025 — homeowners buying with cash or a loan receive $0 in federal credits.
Get a custom battery backup assessment. We will analyze your critical loads, recommend the right battery size, and show you how ConnectedSolutions revenue can make your battery pay for itself.