Grid-tied vs off-grid solar: Which is right for you?
The choice between grid-tied vs off-grid solar comes down to whether you can connect to the utility grid, and whether you want to. Where the grid is available, a grid-tied system is the cheaper and simpler choice: it needs no batteries, and the grid covers nights and cloudy days. An off-grid system buys full independence from the utility, but you pay for it with a large battery bank, an array sized for winter and usually a backup generator. A hybrid system sits in between. It stays connected to the grid and adds batteries, so it can keep the power on during an outage.
This comparison sets the three side by side, explains how each one works, compares what drives their cost, and ends with which to choose for a suburban home, a rural property, a cabin or an outage-prone area.
At a glance
| Grid-tied | Off-grid | Hybrid | |
|---|---|---|---|
| Batteries | None | Required, and large | Yes, usually sized for backup |
| Power during an outage | No, it shuts off | Yes | Yes, for chosen circuits |
| Relative up-front cost | Lowest | Highest | In between |
| Net metering or export credits | Yes, where your utility offers them | No | Yes, where your utility offers them |
| Permits and interconnection | Permit, inspection and utility approval | Often a permit and inspection, no utility approval | Permit, inspection and utility approval |
| Upkeep | Very little | Batteries, generator and watching your use | Some battery monitoring |
| Best for | Cutting a power bill where the grid is reliable | Cabins and remote land with no grid nearby | Homes that want backup power and grid savings |
How a grid-tied system works
A grid-tied system connects your solar panels to your home’s electrical panel and, through it, to the utility grid. A grid-tie inverter (or a microinverter on each panel) converts the panels’ DC power into AC that matches the grid. During the day, your home uses solar power first. Any surplus flows out to the grid, and at night or in cloudy weather you draw from the grid as usual.
What happens to that surplus depends on your utility. Under net metering, exported power earns credits on your bill, often at or near the retail rate. Many utilities now credit exports at a lower rate than they charge for power, which makes it worth using more of your solar power at home. Check your utility’s current rules before you size the system.
The catch is outages. Most grid-tied systems shut down within seconds when the grid fails, even in full sun. This is called anti-islanding: it stops your panels from feeding power into lines that utility crews are repairing. Without batteries, a grid-tied system gives you no backup power. A few inverter models can supply a little power in daylight during an outage, but only with extra equipment, and only while the sun is out.
How an off-grid system works
An off-grid system has no connection to the utility at all. The panels charge a battery bank through a charge controller, and an inverter turns the batteries’ DC power into AC for your outlets and appliances. Everything you use has to come from the sun, the batteries or a generator.
That changes how you size it. With no grid to fall back on, you design for the worst week of the year, not an average day: short winter days, a run of cloudy weather and your heaviest loads. Off-grid arrays are larger than grid-tied ones for the same daily use, and the battery bank has to cover several days with little sun. Our guide to planning an off-grid solar system walks through winter sizing, battery autonomy and backup power step by step.
Hybrid systems
A hybrid system is a grid-tied system with batteries. It stays connected to the grid, and it also stores solar power for the evening and for outages. There are two common ways to build one:
- A hybrid inverter handles the panels, the batteries and the grid connection in one unit.
- An AC-coupled battery adds a battery with its own inverter to an existing grid-tied system. It’s the usual way to add backup to a system that’s already installed.
During an outage, a hybrid system disconnects from the grid and runs your home, or a set of chosen circuits, from the batteries and panels. Most hybrid systems back up a critical-loads panel with the fridge, lights, internet and a well pump rather than the whole house, since central air conditioning and electric heating would drain the batteries quickly. You keep the grid as a backup, so the battery bank can be far smaller than an off-grid one.
Cost compared
Each type has different cost drivers, so it’s worth comparing them by what you’d be buying rather than by a single price:
- Grid-tied costs the least up front. You pay for panels, inverters, mounting, wiring, the permit and the interconnection, with no batteries or charge controller. You keep paying the utility for what you draw, along with any fixed monthly connection fee.
- Off-grid costs the most up front. On top of the panels, you need a battery bank big enough for several days, a charge controller, an off-grid inverter and usually a generator. The array is also larger, because it’s sized for winter. You have no power bill, but batteries and the generator need upkeep and eventual replacement.
- Hybrid sits between the two. It costs what a grid-tied system does plus the batteries and a hybrid or battery inverter. Battery storage is usually the largest added cost.
For a remote property, compare the off-grid total with what the utility would charge to run a line to you. That line extension can cost more than a solar system, which is often what tips the decision toward off grid. Our solar panel cost calculator shows how to estimate a system’s cost step by step, from size and price per watt to incentives and payback.
Which should you choose?
Match the system to where you live and what you need from it:
- A suburban home with reliable grid power: grid-tied. It gives the biggest bill savings for the money, especially if your utility offers net metering.
- A home in an outage-prone area: hybrid. You keep grid savings and get backup power for essential circuits during storms and planned shutoffs.
- A rural property where a grid hookup would be costly: compare the line extension quote with the cost of an off-grid system. If the line is expensive, off grid often wins.
- A cabin, shed or RV: off grid. These loads are small, a grid connection is usually impractical, and you can start small and expand.
- Anyone who wants independence from the utility: off grid, as long as you’re ready to manage your use, maintain batteries and run a generator through long cloudy spells.
If you plan to build it yourself, our guide to planning and building a DIY solar system covers each part, the wiring and the permits.
Frequently asked questions
Can a grid-tied system work during a power outage?
Not on its own. Grid-tied systems without batteries shut off when the grid goes down, so that they can’t send power into lines that crews are working on. To keep power during an outage, you need batteries and an inverter that can disconnect from the grid, which makes it a hybrid system.
Can I switch from grid-tied to off-grid later?
Yes, but it means more than unplugging from the grid. A grid-tie inverter can’t run without the grid, so you’d need batteries, an inverter that can run off grid, and usually more panels to cover winter. Adding batteries to make a hybrid system is a smaller step, and it gives you backup power while keeping the grid connection.
Is off-grid solar cheaper than grid-tied?
Usually not up front. An off-grid system needs a large battery bank, a bigger array and often a generator, so it costs more than a grid-tied system for the same use. It can come out cheaper where connecting to the grid would mean paying for a long utility line.
Do I need a permit for an off-grid solar system?
Often, yes. Many areas require a permit and an inspection for any solar system attached to or wired into a building, even with no utility connection. Off-grid systems skip the utility’s interconnection approval, but check with your local building department before you buy parts.