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May 9, 2026Most residential solar in NJ is grid-tied. Off-grid makes sense in specific situations. Here’s how to think about it and what battery sizing looks like for each.
Grid-Tied Solar (The Standard)
Your panels connect to the utility grid. Excess power exports for net metering credits. You draw from the grid at night and on low-production days. Batteries are optional — added for backup power, not as a requirement. This is 95%+ of residential installs in NJ. The financial case for grid-tied solar here is strong: full retail net metering plus SuSI SREC income of $850–$935/year for a typical 10 kW system means payback around 7–8 years on a cash purchase.
Off-Grid Solar
No utility connection. Your panels and batteries must supply 100% of your power — including cloudy weeks in January when NJ solar production drops to 50–60% of summer levels while heating loads peak. Off-grid requires a significantly larger battery bank and usually a backup generator. Cost is substantially higher than grid-tied for the same usage level.
In New Jersey, true off-grid installs are rare because utility service is almost universally available. A standard grid hookup in NJ costs $2,000–$8,000. In most cases, paying for a grid connection and going grid-tied is considerably cheaper than buying the extra battery capacity needed for off-grid reliability. The exception is properties where the nearest utility line is very far away — rural parcels, lakefront properties with long driveways, or some Barnegat Bay island communities where line extension runs $30,000–$100,000+.
The Hybrid Approach — Grid-Tied With Battery Backup
This is where most NJ homeowners who want resilience end up: grid-tied solar with battery backup. The panels connect to both the grid (for net metering) and a battery (for outage backup). During normal operation, excess solar charges the battery first, then exports to the grid. During an outage, the battery powers your critical loads while the panels continue to recharge it during daylight hours. This approach keeps all the financial benefits of grid-tied solar while adding meaningful outage protection.
Battery Sizing for Grid-Tied Backup
For whole-home backup, size for 1–2 days of critical loads — refrigerator, lights, internet, some outlets. For a typical NJ home that’s 20–40 kWh of storage. Two Tesla Powerwall 3s or three Enphase IQ 5P batteries gives you roughly that range. Most outages in NJ last less than 24 hours. Post-storm extended outages (Sandy-level events) are the exception, not the rule.
For critical loads only — the most cost-effective approach — identify which circuits matter most during an outage and isolate them on a critical loads panel. Refrigerator, internet, a few lights, medical equipment if applicable. That load profile typically runs 5–10 kWh/day, meaning a single 10–14 kWh battery covers 24+ hours at a cost of $8,000–$12,000 installed. Whole-home backup runs $15,000–$25,000+ because you’re sizing for everything running at once.
Battery Sizing for Off-Grid
Off-grid battery sizing has to cover the worst-case scenario — a stretch of cloudy NJ winter days when your panels are producing at their lowest and your usage is at its highest. For a typical NJ home using 1,000 kWh in January, you need to cover 3–5 cloudy days of production gaps, which means 75–125 kWh of usable battery storage. That’s 5–10 Powerwall 3 units before you even price the panels — a battery cost of $60,000–$100,000+.
A generator is almost always part of a practical off-grid design in NJ. A 7 kW propane generator runs $5,000–$8,000 installed and handles the extended cloudy winter periods that batteries alone can’t economically cover. The realistic off-grid NJ design is: a solar array sized for your average load, a battery bank sized for 2–3 days of typical usage, and a generator for the edge cases. More practical than trying to battery-size for the absolute worst week of the year.
NJ Utility Reliability — Context That Matters
NJ utilities report average outage durations of 1–3 hours per customer per year in normal years. That number jumps sharply in storm years — Hurricane Sandy in 2012 caused multi-week outages in parts of coastal NJ, and significant nor’easters have caused 2–5 day outages in suburban areas. If you’ve had more than 2–3 outages longer than 12 hours in the past five years, the insurance value of battery backup is clear. If your history is occasional 2–4 hour blips, the math is softer.
The Practical Advice
For NJ homeowners: stay grid-tied. Add a 10–20 kWh battery if outage resilience matters to you. Off-grid is a significantly more complex and expensive system that’s rarely the right answer when utility connection is available. The hybrid grid-tied-plus-battery approach delivers most of the resilience benefit at a fraction of the cost of going fully off-grid.
What a Critical Loads Panel Actually Is
A critical loads panel is a sub-panel in your home that contains only the circuits that matter most during a power outage. Typically: one or two refrigerator circuits, some lighting, internet and networking equipment, and any medical equipment. During a grid outage, your battery powers this sub-panel exclusively — rather than trying to power your entire home. The result: a smaller battery covers a longer outage for the things that matter most.
The typical NJ critical loads setup — refrigerator, router, a few lights, and one general-purpose outlet — draws 500–800 watts average. A 10 kWh battery at that load covers 12–20 hours of outage backup. The same battery trying to power the whole house (3–5 kW average) covers 2–3 hours. Critical loads paneling multiplies your effective backup time by 5–10x for the same battery capacity. For most NJ homeowners, this is the right approach — not whole-home backup — unless you have specific whole-home resilience requirements.
Generator vs Battery — The Honest Comparison
A 7.5 kW propane standby generator installed in NJ costs $5,000–$8,000 and can power your whole home indefinitely as long as the propane tank is full. A solar-plus-battery system for 24 hours of whole-home backup costs $15,000–$25,000. On upfront cost alone, the generator wins. The case for battery storage: no fuel to maintain, no annual service cost, no noise, instant-on backup (generators have a 10–30 second switchover that interrupts electronics), and it charges itself from the solar panels during daytime hours even during an extended outage.
For NJ homeowners who already have solar, adding battery backup makes more sense than also adding a generator — the battery integrates with the system and is self-replenishing during daylight. For homeowners without solar who want backup-only, a standby generator is often the more cost-effective choice. Jon doesn’t push battery storage on every homeowner — the right answer depends on your specific situation and what you’re trying to accomplish.
The Right Questions to Ask About Battery Sizing
When an installer proposes battery storage for your NJ home, ask these specifically: What load am I sizing this battery for — critical loads only or whole home? How many hours of backup does this provide at that load? What is the cycle life of this battery and what does the warranty say about remaining capacity at end of warranty? And if I add more panels in the future, can this battery system scale up? Getting specific answers to these questions turns a battery proposal from a sales conversation into a technical decision you can evaluate. The right battery size for your NJ home depends entirely on what you’re trying to accomplish — and that question should come before the sizing answer, not after.
What “Whole Home Backup” Actually Means in Practice
Whole-home backup sounds comprehensive, but the practical reality during a grid outage is more nuanced. Most residential battery systems — even large ones — have a power limit (measured in kW) as well as a capacity limit (measured in kWh). A Tesla Powerwall 3 delivers 11.5 kW peak and 5 kW continuous. If your central air conditioner draws 4 kW and your electric stove draws 6 kW and your EV charger draws 7 kW — you can’t run all three simultaneously even with whole-home backup wiring. During an outage, you manage load the same way you would with a generator: prioritize, and don’t run everything at once. Understanding the power delivery limits of your battery system is as important as understanding the storage capacity.
Regardless of which configuration you end up with, the most important decision remains the installer you choose. A grid-tied system installed correctly by an experienced NJ contractor, with proper interconnection handling and SREC registration, will serve you better over 25 years than the most technically sophisticated off-grid design executed by someone who doesn’t know NJ’s utility requirements. Choose the configuration that fits your situation — and then choose the installer who can execute it correctly.
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Grid-Tied or Off-Grid — Let’s Figure Out What Your NJ Home Needs
For most NJ homeowners, grid-tied with backup battery is the right answer. Jon sizes battery systems based on your specific outage history, critical loads, and usage pattern. Book a free call to get a recommendation for your home.
