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Solar panels make direct current (DC) electricity. Your home runs on alternating current (AC). The solar inverter sits between the two and converts one into the other, so it is what turns sunlight-generated power into electricity you can use. These are solar inverters explained in plain terms; the rest of this guide covers what a solar inverter is, how solar inverters work, which types exist, what they cost in 2026, how long they last, and what the new FCC rules mean if you are buying one now.
Key takeaways
- A solar inverter converts DC electricity from solar panels or a battery into AC electricity, the type used by household appliances and the grid.
- The main types are string inverters, microinverters (with power optimizers as a related add-on), and battery or hybrid inverters. Large projects use central inverters.
- The U.S. Department of Energy puts the typical lifetime of PV power electronics, including inverters, at about 10 years, against 20 to 30 years for solar panels. Warranties can run longer: up to 25 years for Enphase microinverters, and 12 years (extendable to 20 or 25) for SolarEdge inverters.
- Since July 28, 2026, new models of foreign-produced, grid-connected inverters with remote-communication features cannot get new FCC authorization. Models that were already authorized can still be sold, installed and used, and an Aug 20 notice narrowed the rule.
- The federal 25D homeowner tax credit does not apply to solar or battery systems whose installation was completed after December 31, 2025.
What Is a Solar Inverter?
90-95%
average efficiency of grid-tie inverters
A solar inverter (also called a PV or photovoltaic inverter) is the device that turns the electricity your solar panels produce into electricity your home can use.
Panels produce direct current, DC. Your lights, outlets, air conditioner and appliances, and the power grid itself, run on alternating current, AC. The inverter sits between the two and converts one into the other.
Conversion is its main job, but not the only one. A modern inverter also squeezes as much power as possible out of the panels, reports how the system is performing, keeps the system in step with the grid, and shuts it down safely when something goes wrong.
Without an inverter, panels can only charge a battery through a charge controller or run DC-only equipment. That is why almost every home solar system has at least one.
Take my energy: What is net metering and how it worksHow Does a Solar Inverter Work?
At its core, a solar inverter works by switching electricity back and forth very fast. Here is what happens, step by step, in a typical grid-connected home system.
- DC comes in.Panels send DC power to the inverter. The voltage changes all day with sunlight and temperature.
- The inverter finds the best operating point.Maximum power point tracking (MPPT) adjusts the electrical load on the panels so they deliver as much power as the conditions allow at that moment. A string inverter does this per input; a microinverter does it per panel.
- Electronic switches flip the current. Inside, power transistors (commonly IGBTs) are arranged in pairs. Closing one diagonal pair sends current one way, and closing the other pair sends it the other way. Flipping 120 times a second produces 60 Hz AC.
- The output is shaped into a sine wave. Switching alone gives a square wave. Pulse width modulation (PWM) pulses the switches within each half-cycle, and the more segments there are, the closer the output gets to a smooth sine wave. Depending on the design, the inverter uses a transformer to raise the voltage, or it is transformerless, which has no isolation between the DC and AC sides and relies on ground-fault monitoring instead.
- The output is matched to the grid. A grid-tied inverter synchronizes with the grid's sine wave, which runs at 60 Hz in North America. If the grid fails, the inverter shuts down quickly. In the US this is a National Electrical Code requirement meant to protect line workers.
- Data goes out.Most modern inverters report production, faults and sometimes consumption through an app or web platform.
How efficient is the conversion?
Manufacturer datasheets list a peak figure and a CEC-weighted figure. The CEC figure averages efficiency across several load levels, so it reflects real operation better than the peak number. For popular residential models, the CEC-weighted figure is about 97% for Enphase IQ8-series microinverters and 99% for SolarEdge Home Wave string inverters (3 to 7.6 kW). Some energy is always lost as heat, which is one reason inverters should be installed somewhere with airflow and shade.
What Does a Solar Inverter Do?
Beyond converting DC to AC, a solar inverter handles six other jobs.
Getting the Most Power Out of the Panels
Panel output changes with sunlight, temperature and shade. The inverter uses maximum power point tracking (MPPT) to keep adjusting its load so the array always delivers as much power as it can.
Monitoring
The inverter reports how the system is performing. With microinverters or optimizers, you can also see how each individual panel is doing.
Connecting to the Grid
When your panels produce more than the home uses, the inverter sends the surplus to the grid. That is what makes net metering or net billing possible. Export rules differ a lot by state and utility, so check yours. Our guide explains what net metering is and how it works.
Protecting the System and the People Near It
Inverters detect electrical arcs and shut the system down before they cause damage. In the US, rooftop systems also need rapid shutdown, so firefighters are not exposed to high-voltage DC on the roof. That requirement comes from NEC section 690.12, and it is a big reason module-level electronics are popular.
Anti-Islanding
During a grid outage, a grid-tied inverter must stop sending power to the lines, so utility workers are not endangered by a home feeding them. IEEE 1547-2018 sets a default time of two seconds to stop energizing an unintended island, and a utility can agree to a different time.
Supporting the Grid
Newer "smart" inverters follow IEEE 1547-2018. It requires them to ride through brief voltage and frequency dips and to adjust their output in response to grid voltage and frequency. UL 1741 Supplement SB certification verifies compliance, and each utility decides which of these functions are switched on in its territory.
Do Solar Panels Work During a Power Outage?
A standard grid-tied solar inverter shuts down during a blackout because of anti-islanding rules, even when the sun is shining. To keep power on during an outage you need a battery-based system with a hybrid or battery inverter, plus the isolation hardware your installer specifies so the home can disconnect from the grid. See our comparison of AC vs DC-coupled solar battery systems.
Types of Solar Inverters
Different types of inverters under the SunThere are several types of PV inverters. Which one fits depends on your roof, budget, shading, and whether you plan to add batteries or go off-grid.
String Inverters: The Standard Centralized Option
String solar inverters are the traditional choice for grid-connected systems. A group of panels is wired in series, and one inverter handles the whole string. A 2019 IHS Markit breakdown by type put string inverters at about 62% of global shipments, central inverters at about 37% and microinverters under 2%. String inverters are also relatively inexpensive and proven.
The main drawback is shading. If one panel in a string is shaded or damaged, it can pull down the output of the rest of the string. Many modern string inverters have more than one MPPT input, which lets you split a roof into separate strings, so this problem is smaller than it used to be. One example is the Fronius Primo GEN24, a residential string inverter with dual MPPT inputs, built-in monitoring and an optional battery connection.
Power optimizers reduce the shading problem. They are installed at the panels, condition the DC output panel by panel, and send it to a central inverter, which still does the conversion to AC. They cost less than a full microinverter system but add more electronics on the roof.
Central inverters are a larger version of the same idea. Strings go to a combiner box and then to one big inverter. They are used in commercial and utility-scale systems.
Microinverters: Panel-Level Conversion at a Higher Cost
Plug and play: Quick start with AC solar panelsA microinverter is mounted at each panel and converts DC to AC right there. Each panel has its own MPPT, so a shaded panel does not hold back the others. Microinverters suit roofs with several orientations, chimneys or trees, and they give per-panel monitoring. They also simplify compliance with rapid shutdown rules, because there is no high-voltage DC run across the roof.
The trade-off is cost. You buy one unit per panel, so at the $160 to $235 per microinverter, the microinverters for a 20-panel system come to roughly $3,200 to $4,700, compared with a single string inverter (plus optimizers, if the model needs them). In the US residential market, Enphase, the leading microinverter maker, held 47% of inverter sales in 2024, and Enphase and SolarEdge (string inverters with optimizers) together have led since 2019 with a combined share above 80%. Some manufacturers also sell "AC panels" with a microinverter pre-installed.
Battery, Hybrid and Off-Grid Inverters
If your system includes batteries, you need an inverter that can manage them. A battery inverter converts DC from the battery to AC. A hybrid inverter handles the panels and the battery in one unit and can supply backup power during an outage. Some multi-mode models can work both on-grid and off-grid.
For off-grid and mobile systems you will also see the pure sine wave versus modified sine wave choice. A pure sine wave inverter produces a smooth, low-distortion output like utility power. Some equipment, including computers with active power-factor-correction supplies, variable-speed tools, audio and video gear, and appliances with microprocessor control, does not run well on modified sine wave power. A grid-tied inverter has to synchronize with the grid's sine wave, so this choice mainly applies to off-grid, RV and backup inverters. If you are choosing an inverter for solar panels in an off-grid setup, a pure sine wave model is the safer pick.
How to Choose an Inverter for Solar Panels
AC vs DC-coupled solar battery systems: Pros and consInverter size is measured in watts (or kilowatts). The AC output rating should be matched to the size of your solar array, but the match does not have to be one to one.
Designers use the DC/AC ratio, which compares the array's DC rating to the inverter's AC rating. A ratio of about 1.2 is a common starting point: NREL's PVWatts calculator uses 1.2 as its default DC-to-AC ratio. Panels rarely produce their full rated power, because of heat, dirt, angle and haze, so a slightly smaller inverter can handle almost everything the array produces. For example, a 6 kW array at a 1.2 ratio pairs with an inverter of about 5 kW. Manufacturers publish their own limits for maximum DC input, so check the datasheet.
Before you buy:
- Check the inverter's maximum DC input and any ratio limits in the datasheet. Installing outside the manufacturer's limits can complicate a warranty claim.
- Confirm the inverter is compatible with your panels' voltage and current.
- Decide whether you want a battery now or later. A hybrid-ready inverter can save a swap.
- Check that the model complies with your utility's interconnection requirements.
- If you are buying in late 2026, check the model's FCC authorization status (see below).
Solar Inverter Cost in 2026
Solar inverter price and cost depend on type, size, brand and features. These are typical US price ranges for the equipment alone.
Typical US equipment prices as of October 2026; installation is not included. Prices change often and vary by brand and region.
A system built with microinverters costs more than one with a single string inverter, but it can recover some of that through higher production on shaded roofs. Total installed price depends on your roof, installer and location. To compare offers, get quotes from solar professionals.
Solar inverter installation and maintenance tipsHow Long Does a Solar Inverter Last?
Lifespan depends on type, build quality, operating environment and maintenance. As a guide:
- String inverters: the U.S. Department of Energy says power electronics typically last about 10 years, against 20 to 30 years for the panels. SolarEdge, for example, gives its inverters a 12-year limited warranty, extendable to 20 or 25 years, and its power optimizers a 25-year warranty.
- Microinverters: built to last as long as the panels. Enphase, for example, backs its IQ8 microinverters with a limited warranty of up to 25 years.
- Hybrid inverters: the inverter portion wears like other power electronics, and warranty terms vary by manufacturer, so check the datasheet and warranty document for the model you choose.
Power electronics typically wear out sooner than the panels, because they are complex electronics working outdoors through heat, cold and humidity. Where you can, install it in a garage or another sheltered, ventilated place away from rain, snow and direct sun. Outdoor-rated models should still be checked for their enclosure and temperature ratings. Regular inspection and monitoring catch problems early.
Not sure what is covered? Read the warranty documents carefully. Terms can differ by country and by whether the warranty covers parts only or also labor.
Solar Inverter Rules and Incentives in 2026
Three developments matter if you are shopping for an inverter now.
- FCC restrictions. Since July 28, 2026, new models of foreign-produced grid-connected inverters cannot get FCC equipment authorization. Models already authorized can still be sold and used.
- No 25D tax credit. The 30% federal credit for homeowners does not apply to systems whose installation was completed after December 31, 2025. Leased and power-purchase systems fall under the business credit (Section 48E), which ends for solar placed in service after 2027 unless construction began by July 4, 2026.
- A softer market. Wood Mackenzie expects the global inverter market to shrink over the next two years, so expect more promotions but also more product churn. Check warranty support before you buy.
Frequently Asked Questions
Related reading:
Find the one inverter that fits your system
We offer string inverters and microinverters for all kinds of solar installations.
Andrei has been a news editor and freelance writer for a number of medias before joining the A1 SolarStore. Climate change and its impact on people's lives have always been among his interests and it partially explains his degree in Philosophy and Ethics.
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