Quick answer
Grid-Tied Solar is a solar system connected to the utility grid through your home’s electrical panel and meter, so the house uses solar power first, draws from the grid when solar falls short, and can send surplus back to the utility.
Most home systems in the US are built this way. The trade-off is that a grid-tied inverter must shut down when the grid goes down, so without a battery the panels do not power the house in an outage.
Quick facts
The key facts about grid-tied solar, with sources:
- Connected to
- The utility grid, through your main panel and a bidirectional meter
- Battery
- None (adding one makes it a hybrid system)
- How common
- Most US PV systems have been grid-connected since 2004 6
- Before it can switch on
- Utility interconnection approval and permission to operate
Key takeaways
- Grid-tied solar is wired to the utility grid. It is the most common home setup.
- Your home uses solar first, then the grid. Extra solar flows out to the grid.
- It shuts off in a blackout by design, to protect line workers.
- Your savings depend mostly on how your utility credits exported power.
- You need utility approval before you can switch it on.
- Add a battery if you want backup. That makes it a hybrid system.
What "grid-tied" means
A grid-tied system runs side by side with the power grid. Your solar and the utility both feed the same wires in your home. You do not flip a switch between them. The inverter matches its output to the grid’s rhythm, and power flows where it is needed.
The EIA says most US PV systems have been tied to the grid since 2004. Before that, solar was mostly used where there were no power lines. Other names for the same thing are grid-connected, on-grid and utility-interactive.
How a grid-tied system runs on a normal day
- Panels produce DC electricity; the inverter converts it to AC synchronized with the grid’s voltage and frequency.
- Your home’s loads use that solar power first.
- When the panels make more than the house needs, the surplus flows out through the meter to the grid.
- At night or under heavy cloud, the house draws from the grid as before.
- The utility bills or credits the difference under its export rule: net metering, net billing or a buyback rate.
How that credit is valued varies by utility, and it decides most of a grid-tied system’s savings. Our net metering vs net billing guide explains the three.
Why grid-tied solar shuts off in a power outage
When the grid fails, crews go out to repair lines they expect to be dead. A solar inverter that kept pushing power onto those lines would create an "island": a stretch of grid energized by your roof with no utility control over it. That is a shock hazard to line workers and can damage equipment.
So grid-tied inverters are built to detect the loss of the grid and stop.
IEEE 1547, the US standard for connecting distributed energy resources, requires that the system detect an unintentional island and stop energizing the grid within two seconds of it forming.
Inverters are tested and listed to UL 1741 to prove they do it.
Georgia Power, for example, requires inverter spec sheets to show the UL 1741 SB and IEEE 1547-2018 listing. Its summary states that when grid power is lost the inverter "must cease-to-energize".
The DOE adds a nuance: modern home inverters are meant to ride through brief, small voltage or frequency blips, and disconnect only when the disruption is long or large. A flicker may not trip your system; a real outage will.
Ways to keep power when the grid is down
| Option | What it adds | What it powers |
|---|---|---|
| Battery with backup gateway (a hybrid system) | Battery, an automatic transfer device, often a critical-loads subpanel | Backed-up circuits, recharged by solar during the day |
| Inverter with a daytime backup outlet | A dedicated outlet some inverters provide during outages | A few small loads, only while the sun is up |
| Standby generator | A generator and transfer switch, separate from the solar | Whatever the generator is sized for; solar stays off |
Grid-tied inverter setups
| Setup | How it works | Trade-off |
|---|---|---|
| String inverter | One inverter for a string of panels | Lower cost; shade on one panel affects the string |
| Microinverters | A small inverter on each panel | Shade on one panel does not drag others down; tends to cost more |
| Power optimizers | A device per panel feeding one inverter | A middle path |
Grid-tied vs hybrid vs off-grid
| Grid-tied | Hybrid | Off-grid | |
|---|---|---|---|
| Utility connection | Yes | Yes | No |
| Battery | No | Yes | Yes, sized for days |
| Works in an outage | No | Yes, backed-up circuits | Always on its own |
| Export credits | Yes, where the utility credits exports | Yes | None |
| Equipment | Fewest parts | Adds battery and backup controls | Larger battery, often a generator |
| Glossary | This page | Hybrid system types | Off-grid vs grid-tied |
Example: one sunny day on a Duke Energy Carolinas Solar Choice bill in SC
This example uses Duke Energy Carolinas’ South Carolina Rider RSC, which nets usage within each time-of-use period monthly and credits net excess at $0.0419/kWh 10. The kWh figures are made up to show the logic.
| Moment | What happens | Effect on the bill |
|---|---|---|
| Noon, panels make 6 kW, home uses 2 kW | 4 kW flows out through the meter | Exported kWh are recorded |
| Evening, panels make 0 kW, home uses 3 kW | All 3 kW comes from the grid | Imported kWh are recorded |
| End of month, same period | Exports offset imports in the same time-of-use period | You pay for net imports only |
| If exports beat imports | The leftover is net excess | Credited at $0.0419 per kWh 10 |
Other utilities net hourly, monthly or yearly, and pay different rates. Check your own tariff before trusting any savings estimate.
Where grid-tied solar is used
Almost every rooftop system on a home with utility power is grid-tied. It also covers most commercial rooftops and solar carports.
On paperwork you will see it as "interconnection" or "parallel operation". Your utility’s application, the permit drawings and the meter tag all mark the system as grid-connected.
Benefits and limits of grid-tied solar
Benefits
- Fewest parts, so usually the lowest upfront cost.
- The grid acts like a backstop at night and on cloudy days.
- Extra power can earn credits where your utility pays for exports.
- No battery to replace.
Limits
- No power in a blackout without a battery.
- Savings depend on utility rules that can change for new customers.
- You still pay fixed monthly charges.
- Needs utility approval and a meter change.
Limits you will meet
Utility rules set the ceiling. Many cap system size, often by kW or by your past use. Many pay less for exported power than they charge for grid power. Some keep a minimum bill.
Rules can change. A program open today may close to new customers. Our guide to what happens if net metering ends covers this. Ask whether your rate is locked for a term.
What drives the cost of grid-tied solar
Grid-tied systems skip the battery, which is the biggest single add-on. The main cost drivers are system size, panel and inverter type, roof work, any main panel upgrade, permits and labor. See our cost per watt guide.
For lifespan, plan on replacing the inverter at least once over the life of the array, as the DOE expects. Panels last much longer.
The federal 25D homeowner credit ended for property placed in service after 31 December 2025, per the IRS. Any quote that still promises it is out of date.
How a grid-tied system gets connected
Your installer handles most of this. A licensed electrician does the wiring.
- The installer designs the system and sizes it to your use and the utility cap.
- The installer files the utility interconnection application with the inverter spec sheets.
- The city or county issues building and electrical permits.
- Crews install the system, but it stays off.
- A local inspector checks the work.
- The utility swaps or programs the meter.
- The utility gives permission to operate (PTO). Only then do you switch on.
Living with a grid-tied system
Check the app and your bill each month. The bill shows imports and exports; the app shows production. If production is fine but credits look wrong, call the utility. If production drops, call the installer.
After a blackout, the inverter should restart by itself once the grid has been stable for a short time. If it does not, check the app, then call your installer. Read our guide to your first bill after solar.
Warning signs and when to call a pro
Call your installer or a licensed electrician if:
- The inverter stays off long after grid power returns.
- The solar breaker keeps tripping.
- The bill shows no exports on sunny months.
- The app shows grid-error codes again and again.
- Lights flicker or dim when the sun comes out.
- You switched on before the utility gave permission to operate. Switch off and call the installer.
Safety rule
Never use a homemade link or "backfeed" plug to power your home from solar or a generator in a blackout. It can energize lines and kill a line worker. Backup must be installed by a licensed electrician.
Standards and rules for grid-tied solar
Interconnection standard. IEEE 1547-2018 sets how distributed energy resources connect to the grid, including anti-islanding. Utilities write it into their rules.
Inverter listing. Inverters are tested to UL 1741. Georgia Power, for example, requires UL 1741 SB listing.
Electrical code. The NEC covers PV in Article 690 and grid connection in Article 705, which the 2023 edition largely rewrote, per IAEI.
Export rules. Each state regulator approves its utilities’ export credits. Municipal utilities and co-ops often set their own.
Misconceptions
- Myth Solar panels will power my home in a blackout.
- Reality A grid-tied system without a battery shuts off by design.
- Myth Grid-tied means I never pay a bill.
- Reality Most utilities keep a fixed charge, and night use may exceed your credits.
- Myth The utility must pay retail for every kWh I export.
- Reality Export pay varies by utility. Many pay less than retail.
- Myth I can switch on as soon as the panels are up.
- Reality You must wait for inspection and permission to operate.
Grid connection rules in SC, GA and VA
In South Carolina, Act 62 of 2019 requires that behind-the-meter self-use be allowed without penalty, and customers who applied before 1 June 2021 keep legacy net metering until 31 May 2029 9.
Santee Cooper credits exports at $0.0415/kWh under rider DG-25, netted hourly 11.
Georgia Power offers two residential paths: Energy Offset Only, where the system may not export and is not paid for any power that reaches the grid, and RNR, which credits exports for systems of 10 kW or less 3.
In Virginia, the SCC approved Dominion’s NEM 2.0, which credits annual net excess at $0.05829/kWh for new non-low-income interconnections from about 1 May 2027 12.
Is grid-tied solar enough for you?
A grid-tied system without a battery fits best when:
- Outages are rare and short where you live.
- Your utility gives fair credit for exports.
- You want the lowest upfront cost.
- You may add a battery later; ask for a battery-ready design.
Related guides
Questions about grid-tied solar
Does grid-tied solar work during a power outage?
No, not on its own. The inverter must detect the outage and stop within seconds so it cannot energize lines crews are repairing. A battery with a backup gateway lets solar keep running your backed-up circuits. A few inverters offer a small daytime-only outlet.
What is anti-islanding?
It is the inverter function that detects the grid has gone down and stops sending power to it. IEEE 1547 requires it, with a two-second limit to stop after an island forms. Inverters are tested for it under UL 1741.
Can I add a battery to an existing grid-tied system?
Usually, yes, with an AC-coupled battery or a hybrid inverter, and a new utility application. See our page on adding a battery to an existing system. Your installer checks the main panel and inverter first.
Do I still pay an electric bill with grid-tied solar?
Usually a smaller one. Most utilities keep a fixed monthly charge, and you still pay for grid power used at night beyond what your export credits cover. Some utilities also have a minimum bill for solar customers.
Is grid-tied the same as on-grid?
Yes. Grid-tied, grid-connected, on-grid and utility-interactive all mean a solar system wired to operate in parallel with the utility grid. They all shut down in a blackout unless a battery and backup controls are added.
Why does my grid-tied inverter turn off when the power flickers?
It may not. The DOE says home inverters are meant to ride through small, brief blips. If the disturbance is long or large, they disconnect for safety. Once the grid is stable again, the inverter usually reconnects on its own.
Is grid-tied or off-grid solar better?
For most homes with utility power, grid-tied is simpler and cheaper, because the grid covers nights and cloudy days. Off-grid makes sense where power lines are far away. It needs large batteries and often a generator.
How long does it take to connect a grid-tied system?
It depends on your utility and local permit office. The steps are design, permits, utility application, install, inspection and permission to operate. Delays usually come from paperwork, not the install day.
What happens to extra solar power on a grid-tied system?
It flows out through your meter to the grid, where neighbors use it. Your utility records it and credits you under its export rule. The rate and timing vary a lot by utility.
Sources
- IEEE, Standard 1547-2018 for Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces, retrieved .
- Carter Machinery / Caterpillar white paper, IEEE 1547 Unintentional Islanding Protection (quotes IEEE 1547 §4.4.1), retrieved .
- Georgia Power, Behind-the-Meter Interconnection Summary for Residential Customers (rev. 15 Aug 2025), retrieved .
- US DOE Solar Energy Technologies Office, Solar Integration: Inverters and Grid Services Basics, retrieved .
- US DOE Solar Energy Technologies Office, Solar Photovoltaic System Design Basics, retrieved .
- US EIA, Solar explained: Photovoltaics and electricity, retrieved .
- IAEI Magazine, John Wiles, 2023 National Electrical Code and Photovoltaic Power Systems (23 Mar 2023), retrieved .
- IRS, Residential Clean Energy Credit (§25D), retrieved .
- South Carolina Code Title 58 Ch. 40 (Act 62 of 2019, customer-generators), retrieved .
- Duke Energy Carolinas (SC), Rider RSC Residential Solar Choice, retrieved .
- Santee Cooper, Distributed Generation Rider DG-25, retrieved .
- Virginia SCC, Order on Clarification, Case PUR-2025-00079 (20 May 2026), retrieved .
Expert review
Written by the HyreSolar Research team. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.
How the numbers were checked: The islanding requirement is from IEEE 1547 as quoted in the cited white paper and as applied in Georgia Power’s residential interconnection summary. Ride-through behavior and inverter types are from the DOE.
SC tariff figures come from sc-local/facts.js (retrieved 5 Oct 2026); Virginia from the verified SCC order row. The bill example uses made-up kWh to show the netting logic.
Suggest a correction. We fix errors and say what changed.