Going fully off-grid with solar in the South is more achievable than most people think — and more demanding than most solar salespeople will tell you. The Southern US has the sun resource to make it work, but the heat, humidity, and seasonal load spikes require a system designed for the real conditions of living here. This guide covers what an off-grid solar system actually requires in Georgia, Alabama, Tennessee, or the Carolinas, and which equipment is suited for the job.
Last updated: May 2026
Is Going Off-Grid Realistic in the South?
Yes — with the right system size. The Southern US averages 4.5–5.5 peak sun hours per day depending on location, which is genuinely good solar territory. The challenge is the summer cooling load: a typical Georgia home running central AC might draw 2,000–4,000 Wh per day just for cooling, on top of normal household loads.
An off-grid system in the South needs to be sized not for average daily use, but for the worst-case scenario: a cloudy week in July with the AC running hard. That usually means a larger array than you’d expect and substantial battery capacity.
What an Off-Grid Solar System Requires
A complete off-grid system has four main components:
- Solar array — typically 8–20 kW for a full-home off-grid setup in the South, depending on your loads
- Battery bank — aim for 2–4 days of storage at average usage, not minimum; in the South, that usually means 20–40 kWh of usable capacity
- Inverter/charger — converts DC power from panels/batteries to AC for home use; handles battery charging from solar and optional generator
- Backup generator — almost always necessary for Southern off-grid; a propane or diesel unit to cover extended cloudy stretches
For most Southern homeowners, a hybrid approach — grid-tied with battery backup — is more practical than full off-grid and costs significantly less to implement.
Sizing Your System for Southern Conditions
Start with your actual energy audit. Pull 12 months of utility bills and identify your peak month (usually July or August in the South). Size your solar array to cover that peak month’s usage, not the annual average.
Example for a 2,000 sq ft Georgia home:
- Average monthly use: ~1,400 kWh (July peak: ~1,900 kWh)
- Daily average in July: ~62 kWh
- Required array at 5 peak sun hours: 62 ÷ 5 × 1.25 (inefficiency factor) = ~15.5 kW
- Battery storage for 3 cloudy days: 62 × 3 = 186 kWh total; ~93 kWh usable (50% DoD for lead-acid) or 130–150 kWh for LFP batteries
That’s a large and expensive system. Most Southern homeowners going “off-grid” end up with a grid-tied-with-storage system that covers 80–90% of their usage and keeps the grid as a backstop for extreme events.
Best Equipment Options for Southern Off-Grid Systems
Inergy Apex — Best for Off-Grid Portability and Scalability
The Inergy Apex (use code PZSGK8326) is a well-regarded choice for off-grid cabins, secondary structures, and homeowners building toward full independence gradually. It’s designed around modularity — you can stack multiple Apex units to build capacity as your needs grow, without replacing the core inverter/charger.
The Apex handles both solar input and generator charging, which is critical for Southern off-grid setups where summer cloud cover or a stretch of rainy days will drain any battery bank. It’s lighter and more portable than whole-home battery systems, making it ideal for cabins, workshops, and off-grid tiny homes.
Zendure SolarFlow / AIO — Best for Grid-Tied + Storage
If you’re doing a hybrid setup rather than full off-grid, Zendure’s home battery systems are worth a look. Their AIO (all-in-one) units pair well with existing solar installations and support time-of-use optimization — storing solar energy and using it during peak grid pricing hours, which increasingly matters as Southern utilities move toward demand-based rate structures.
Permits, Codes, and Off-Grid Legal Considerations in the South
Full off-grid living is legal in most Southern states but subject to county-level building codes. Georgia, Tennessee, and North Carolina all allow off-grid solar systems, but require permits for electrical work above a certain threshold. Some rural counties have minimal inspection requirements; others will require a licensed electrician to sign off on the system design.
Check with your county building department before purchasing equipment. If you’re on well water and septic, the path to true off-grid is simpler than if you’re in a subdivision with HOA restrictions or utility easements.
The Generator Question
Every Southern off-grid system needs a backup generator. The question is what size and fuel type. For a home-scale system:
- Propane: cleaner burning, indefinite storage, works in cold weather — good for rural properties with existing propane tanks
- Diesel: more fuel-efficient at high loads, widely available — better for large systems or agricultural properties
- Natural gas: convenient if you have a gas line, but requires utility connection which undermines full off-grid
Size the generator to handle your full AC load plus battery charging simultaneously — usually 10–15 kW for a family home in the South.
Costs of Going Off-Grid in the South
A full off-grid solar system for a Southern home typically costs $40,000–$80,000 installed, depending on system size, battery capacity, and whether generator integration is included. That’s significantly more than a grid-tied system ($25,000–$40,000) for the same home.
The payback period for true off-grid is longer than grid-tied — you’re eliminating a utility bill rather than reducing it, but the upfront cost is much higher. The math works best when: you’re building new construction far from grid access, your property has prohibitively expensive grid connection costs, or energy independence is a priority over pure financial return.
For more on home battery options, see our guide on Best Power Station for Running a Window AC Unit.
Frequently Asked Questions
How much solar do I need to go off-grid in the South?
Most Southern homes need 12–20 kW of solar panels to go fully off-grid, plus 30–60 kWh of usable battery storage. The summer cooling load drives the numbers — size for July usage, not annual average. Most homeowners end up with a grid-tied-plus-storage hybrid that covers 80–90% of usage instead of true off-grid.
Is off-grid solar legal in Georgia and Tennessee?
Yes, off-grid solar is legal in both states. Electrical installations require permits and inspections in most counties. Some rural counties have minimal oversight; others require a licensed electrician sign-off. Check with your specific county building department before purchasing equipment.
Do I need a generator if I go off-grid in the South?
Almost certainly yes. Extended cloudy periods, particularly in winter, will drain any reasonably sized battery bank. A backup generator — propane or diesel — is the standard approach for Southern off-grid systems. Size it to handle your full load plus battery charging simultaneously.
What’s the difference between off-grid and grid-tied with battery backup?
Off-grid means you have no utility connection — your solar, battery, and generator are your only power sources. Grid-tied with battery backup keeps the utility connection as a backstop, while a battery handles outages and peak-hour coverage. For most Southern homeowners, grid-tied-plus-storage is more practical and costs $20,000–$40,000 less than equivalent off-grid capacity.
Bottom Line
Going off-grid in the South is real and achievable, but it requires a larger, more expensive system than most solar salespeople will quote you at first glance. Size for your July peak load, plan for a backup generator, and seriously consider whether a grid-tied-with-storage system accomplishes 90% of what you want at 60% of the cost. If true independence is the goal, the Inergy Apex and Zendure home batteries are solid building blocks for Southern conditions.