Imagine your home suddenly goes dark during a storm, but your solar panels are sitting idle on your roof. It is a frustrating experience to have clean energy available while you are stuck without power. This disconnect happens because your solar system needs a bridge to safely switch between the grid and your backup power. That bridge is called an Automatic Transfer Switch (ATS).
Choosing the right ATS for a solar setup is not always easy. Many homeowners feel overwhelmed by technical jargon, different amperage ratings, and complex wiring requirements. Picking the wrong device can lead to safety risks or system failures, leaving you worried about your investment. You need a solution that works seamlessly without constant manual adjustments.
This guide cuts through the confusion to help you understand how an Automatic Transfer Switch keeps your home running smoothly. We will break down the essential features you should look for and explain how to match the right switch to your specific energy needs. By the end of this post, you will feel confident in selecting the perfect unit for your home.
Ready to take control of your backup power system? Let’s dive into the details and find the best switch for your solar setup.
Top Automatic Transfer Switch For Solar Recommendations
No. 1
MOES Dual Power Controller 50A 5500 Watt Automatic Transfer Switch for Off Grid Solar Wind System ATS DC 12V 24V 48V AC 110V 220V.
- 【Beneficial to Solar or Wind System】: On cloudy or windless days when your battery gets low, it will automatically switch to grid power, protect your battery.
- 【Works like an opposite direction UPS】: The ATS controller will switch to grid power when batteries votagle are lower than cut off point,it will switch back to battery power when the batteries votagle are higher than recovery point.
- 【Auto distinguish】: DC 12/24/48V,AC 100-120V 60HZ / 220-240V 50HZ auto distinguish.User can define the Cut-Off and Recovery Voltages.Recovery voltage must be higher than Cut-off voltage. Battery type: Suitable for Sealed,Gel,Lead-acid,Lithium battery and so on. as long as the voltage of your battery are within the voltage ranges in the followings.9-17V at 12V system;18-30V at 24V system; 30-60V at 48V system.
- 【Big Power】: 5.5kw(110V) or 11KW(220v),Fast Transfer time:Inverter transfer to public power ≤10ms,public power transfer to inverter ≤16ms.
- 【LCD display】: Battery real-time voltage;working status of public power,inverter and battery.⭐Note: The controller needs to connect the battery, powered by the battery and get battery power data.
No. 2
Renogy 30Amp Transfer Switch for Solar Inverters, Home Generators, Shore Power, ATS, Automatic Transfer Switch for RV, Travel Trailer, Camping Van, 120VAC
- 【Seamless Power Switching for Uninterrupted Supply】Automatically switches to backup power when the main source fails, and back again once it's restored—no manual action needed, ensuring continuous power flow. Widely used in shore power, solar inverters, and generators.
- 【Versatile Compatibility Across Applications】Fully compatible with Renogy 1000W, 2000W, 3000W pure sine wave inverters and other brands' battery inverters. Ideal for RVs, camping vans, off-grid systems, and backup home power setups.
- 【Built Tough for Harsh Environments】Constructed with high-quality, heat-resistant, and corrosion-proof ABS materials, built to withstand challenging conditions and deliver long-lasting performance.
- 【Easy Installation】 Mounts securely to walls or floors using built-in screw holes. Designed for dry, well-ventilated locations. For outdoor use, installation in a waterproof enclosure is required to protect against moisture.
- 【Built-In Time Delay】 Features a 20–30 second delay when switching to generator power, helping to stabilize voltage during startup and protect connected equipment from power surges or frequent switching.
No. 3
100Amp AC110V Automatic/Manual Transfer Switch 2P 50/60Hz, 2POLE 100A Mini ATS Solar Auto Dual Power Switch for Home Generator, Din Rail Mounted Cn Automatic Changeover Fast Transfe for Rv, Lv Power
- Functions and Features: 100a 2p dual power auto transfer switch W2R is a PC-level infrequent switching switch, mainly used for automatic or manual conversion of two power supplies, and can test whether the common power supply or backup power supply is normal. When the common power supply A is abnormal, the backup power supply B is quickly switched and put into use within 0.05 seconds to ensure the continuity, reliability and safety of power supply. When the common power supply returns to normal, it automatically switches from the backup power supply to the common power supply. Both power supply A and power supply B can be connected to the mains/generator/photovoltaic, with four wiring.
- Automatic Mode: ac 110v automatic transfer switch use the automatic mode, the left switch must be in the Auto, and the red handle on the right should point to Source A. When the normal power source A is working normally, A (red light) is always on; when the normal power source A is abnormal, A (green light) goes out and switches to the automatic power source B within 0.05 seconds, and B (green light) is on. When the normal power source A returns to normal, it will automatically switch from the backup power source B to the normal power source A.
- Manual Mode: automatic transfer switch use manual mode to make sure the left switch is in Manual. If you choose power source A, operate the red switch handle on the right to point to Sonrce A, and LED indicator A (red light) will be on. If you choose power source B, manually operate the red switch handle on the right to point the switch to Source B, and LED indicator B (red light) will be on.
- 110V Over-Voltage and Under-Voltage Protection: automatic transfer switch 110v designed for home track installation, dedicated to PZ30 distribution box. This series of automatic transfer switches is suitable for 50/60Hz dual power grid. The working current is 100A. 110V/50Hz Undervoltage value: 85V, Recovery value: 95V; Overvoltage value: 145V, Recovery value: 130V (± 5V). Please select the 2p 100a transfer switch dual power automatic changeover switch 110v with the corresponding specifications according to the actual working voltage you need
- Wide Application: This 2P dual power ATS ensures a stable power supply, it is used in situations where power outages cannot be sustained,which is very suitable for high-demand equipment; used in hospitals, low-temperature cold storage, data centers and emergency systems, it can automatically and quickly switch to the backup power supply during the power outage of the main power supply to ensure safe and reliable power supply. Suitable for indoor and outdoor generators
No. 4
Aeliussine 63A Automatic Transfer Switch 110V 2P ATS with LCD Display, Real-Time Voltage Current Monitoring for Generator Solar Utility Power
- 【Smart Dual-Power Auto Switching】Automatically switches to backup power (generator/solar/inverter) during outages or voltage instability within 3 seconds, ensuring continuous equipment operation. Returns to main power automatically once stable with no manual intervention required, ideal for residential, commercial, and industrial applications.
- 【Triple LCD Real-Time Monitoring】Equipped with 3 independent LCD displays: left screen shows L1 power voltage, right screen shows L2 power voltage, center screen shows output current. Instantly monitor dual-input and load status during critical power switching moments for complete situational awareness.
- 【Fully Adjustable Protection】63A overcurrent protection with customizable voltage thresholds (under-voltage 80-220V, over-voltage 110-300V) precisely matches your equipment needs. Adjustable startup delay (1-600s, default 5s) and recovery delay (1-600s, default 30s) prevent frequent switching damage and extend equipment lifespan.
- 【DIN Rail Quick Installation】Compact design with standard 35mm DIN rail mounting, completed in minutes. Rugged engineering design saves space, suitable for distribution boxes and control cabinets. Easily operated by professional electricians and DIY enthusiasts alike with clear terminal markings.
- 【Industrial-Grade Reliability & Wide Compatibility】Manufactured with industrial-grade components rated for -10°C to 50°C operating temperatures with IP20 protection and CE/RoHS compliance. Seamlessly integrates with portable generators, solar inverter systems, backup battery systems, UPS units, and standard utility power for comprehensive power management.
No. 5
MOES Smart Automatic Transfer Switch for Off Grid Solar Wind System, Dual Power Controller 80A 8Kw Provides Automatic Power Switching Between Inverter and AC 110V, 220V, APP Remote Control with Hub
- 【Energy Saving and Battery Protection】Provides automatic power switching between DC input sources (inverter）and AC input sources (public power) . Allows you to take full advantage of solar & wind energy and protects your battery. Added the function of manual sources switching, BMS and MOES app Bluetooth control. To achieve scene linkage and remote control outside the Bluetooth range you need to add a MOES Bluetooth hub (in the package).
- 【Solar & Wind to Grid Switch】On cloudy or windless days when your battery voltage is lower than cut off point, it will automatically switch to grid power to protect your battery, it will automatically switch back to inverter power when the battery voltage is higher than recovery point, working like an opposite direction UPS.
- 【Uninterrupted Power Switching】Not only provides fast automatic switching, but also manual and app switching. The fast switching will not affect your load usage and power outages, allowing you to continue working or gaming, and stay connected to your network. Switching interval time : Inverter switching to public power ≤10ms, public switching to inverter ≤16ms.
- 【Battery Management System】Timely access to the current voltage of grid, battery and inverter, specially the current, power and electricity consumption of the load, performing as the advanced power system for better power supply.
- 【Safer Circuit】Added the design of surge protection to prevent surge damage to the inverter.
No. 6
100Amp 110V AC Dual Power Automatic Transfer Switch, ATS 2P Manual Changeover Electrical Switch, Solar Back Up Power Auto Selector Overvoltage, Undervoltage 50/60Hz CE Certified
- FUNCTIONS AND FEATURES: The ATS automatic transfer switch is a PC-class, low-frequency transfer switch designed for automatic or manual switching between two power sources. automatic transfer switch 100A can detect the functioning of either the primary or backup power source. transfer switch switches power sources (either mains or inverter) within 0.05 seconds, ensuring uninterruptible power supply. If the primary power source experiences an abnormality, the backup source immediately takes over, ensuring continuity, reliability, and safety. When the primary power source returns to normal, 100Amp ats transfer switch 110V automatically switches back to the primary source
- AUTOMATIC MODE: the Automatic Transfer Switch (ATS) is activated and begins continuous power monitoring. It prioritizes the primary power source (L1). In the event of a failure or irregularity with L1, the ATS will automatically and seamlessly transfer the electrical load to the backup power source (L2).Once the primary power source L1 is restored and stabilized, the ATS will then automatically transfer the load back from L2 to L1, ensuring a return to normal operation.
- Manual Mode: For manual operation, first confirm the switch is in "Manual" mode. When power is L1 off, just flip the switch to the "L2" position. The connection is made automatically, making the process simple and convenient.
- 110V OVER AND UNDER-VOLTAGE PROTECTION: 2Pole dual power automatic transfer switch 110v designed for home track installation, dedicated to PZ30 distribution box. dual power automatic transfer switches is suitable for 50/60Hz dual power grid. auto dual power transfer switch working current is between 6A-100A. 110V/50Hz Undervoltage value: 85V, Recovery value: 95V; Overvoltage value: 145V, Recovery value: 130V (± 5V)
- MULTI-SCENARIO APPLICATION：This dual-power automatic transfer switch (ATS) ensures a stable power supply and is suitable for use in situations where power outages are unacceptable. ac 110v automatic transfer switch is suitable for home power protection, small shops/convenience stores, medical equipment power supply, data centers and emergency systems, uninterrupted production line operation, photovoltaic microgrids, and indoor Rv, Lv, Cn Public/Backup Power and outdoor
No. 7
100A Automatic Transfer Switch,220V Generator Transfer Switch,Millisecond Level Dual Power Automatic Transfer Switch, with Metal Distribution Box (2P 110V PV)
- VISUAL DISTRIBUTION BOX SHELL: This transfer switch comes with a distribution box shell, which is made of high-quality steel material, a visual transparent flip cover, C45 guide rails, and wiring terminals, making it safe and durable. Under the protection of the anti touch shell of the power supply, the ATS conversion switch can be clearly viewed or operated, providing safety assurance for personnel and equipment, making your use safer and more reassuring.
- WIDELY APPLICABLE: This dual power transfer switch ensures stable power supply and is suitable for power systems and equipment that require stable power input and dual power supply protection; ATS is an excellent equipment used in homes, hospitals, low-temperature cold storage, data centers, and emergency systems. It can quickly switch to the backup power supply within 0.05ms in the event of a main power outage to ensure safe and reliable power supply.
- QUALITY ASSURANCE: The generator transfer switch is made of high-quality materials with guaranteed quality. The product offers a 30 day no reason return and a 3-year warranty to ensure you have a worry free shopping experience. If you have any questions about installation or use, or encounter any problems during use, our customer service team is always available to assist.
No. 8
100Amp AC110V Automatic/Manual Transfer Switch 3P 50/60Hz, 3POLE 100A Mini ATS Solar Auto Dual Power Switch W2R for Home Generator, Din Rail Mount Cn Automatic Changeover Fast Transfe for,Rv,Lv Power
- Functions and Features: 100a 3p dual power auto transfer switch W2R is a PC-level infrequent switching switch, mainly used for automatic or manual conversion of two power supplies, and can test whether the common power supply or backup power supply is normal. When the common power supply A is abnormal, the backup power supply B is quickly switched and put into use within 0.05 seconds to ensure the continuity, reliability and safety of power supply. When the common power supply returns to normal, it automatically switches from the backup power supply to the common power supply. Both power supply A and power supply B can be connected to the mains/generator/photovoltaic, with four wiring
- Automatic Mode: ac 110v automatic transfer switch use the automatic mode, the left switch must be in the Auto, and the red handle on the right should point to Source A. When the normal power source A is working normally, A (red light) is always on; when the normal power source A is abnormal, A (green light) goes out and switches to the automatic power source B within 0.05 seconds, and B (green light) is on. When the normal power source A returns to normal, it will automatically switch from the backup power source B to the normal power source A.
- Manual Mode: automatic transfer switch use manual mode to make sure the left switch is in Manual. If you choose power source A, operate the red switch handle on the right to point to Sonrce A, and LED indicator A (red light) will be on. If you choose power source B, manually operate the red switch handle on the right to point the switch to Source B, and LED indicator B (red light) will be on.
- 110V Over-Voltage and Under-Voltage Protection: automatic transfer switch 110v designed for home track installation, dedicated to PZ30 distribution box. This series of automatic transfer switches is suitable for 50/60Hz dual power grid. The working current is 100A. 110V/50Hz Undervoltage value: 85V, Recovery value: 95V; Overvoltage value: 145V, Recovery value: 130V (± 5V). Please select the product with the corresponding specifications according to the actual working voltage you need
- Wide Application: This 3p dual power ATS ensures a stable power supply, it is used in situations where power outages cannot be sustained,which is very suitable for high-demand equipment; used in hospitals, low-temperature cold storage, data centers and emergency systems, it can automatically and quickly switch to the backup power supply during the power outage of the main power supply to ensure safe and reliable power supply. Suitable for indoor and outdoor generators
The Ultimate Buying Guide: Choosing an Automatic Transfer Switch for Solar
An Automatic Transfer Switch (ATS) is a vital bridge between your solar power system and the utility grid. It acts like a smart gatekeeper. When your solar batteries run low or the grid goes down, the ATS keeps your lights on without you lifting a finger. Choosing the right one ensures your home stays powered safely and efficiently.
Key Features to Look For
When shopping for an ATS, prioritize these features:
- Switching Speed: Look for a fast transfer time. A speed under 20 milliseconds keeps your sensitive electronics, like computers, running without a glitch.
- Amperage Rating: Match the switch to your home’s electrical panel. Common ratings are 30A, 50A, or 100A.
- Dual Power Input: Ensure the device can handle both solar/battery inputs and utility grid inputs simultaneously.
- Safety Certifications: Always check for UL or ETL listings. These certifications prove the device meets strict safety standards.
Important Materials
The quality of an ATS depends on its build. Look for a heavy-duty metal enclosure. Metal protects the internal parts from dust, moisture, and accidental damage. The internal contacts should be made of high-grade copper or silver alloys. These materials conduct electricity well and prevent overheating. Avoid switches with flimsy plastic casings if you plan to install them in a garage or utility shed.
Factors That Affect Quality
Several factors determine if an ATS will last for years or fail quickly.
- Cooling Design: High-quality switches have vents or heat sinks to manage temperature. Overheating is the primary cause of switch failure.
- Manual Override: A good switch includes a manual handle. This allows you to switch power sources by hand if the automatic system fails.
- Surge Protection: Integrated surge protection prevents lightning strikes or grid spikes from frying your expensive solar equipment.
User Experience and Use Cases
Most users install an ATS to create a seamless backup system. For example, if you live in an area with frequent blackouts, an ATS allows your solar battery to take over instantly. You won’t even notice the power went out.
For those living off-grid, an ATS can manage a backup generator. When your solar batteries drop below a certain percentage, the switch signals the generator to start. Once the batteries are charged, the switch returns the load to the solar system. This automation saves fuel and extends the life of your battery bank.
Frequently Asked Questions
Q: Do I need a professional to install an ATS?
A: Yes. Working with high-voltage electricity is dangerous. Always hire a licensed electrician to ensure the installation meets local building codes.
Q: Can any ATS work with a solar system?
A: Not necessarily. You must buy an ATS specifically designed for solar and battery storage systems to ensure compatibility with your inverter.
Q: What happens if the ATS fails?
A: If a high-quality ATS fails, it typically defaults to the grid. This prevents your home from losing power completely.
Q: Does an ATS consume power?
A: Yes, but very little. Most units use a tiny amount of electricity to keep the internal monitoring sensors active.
Q: Can I use an ATS with a portable solar generator?
A: Some portable units have built-in transfer switches. However, most standalone ATS units are designed for permanent home battery systems.
Q: Is the transfer time noticeable?
A: With a modern ATS, the transfer happens in milliseconds. Most appliances will not even flicker.
Q: How do I know which amperage I need?
A: Check your main electrical panel. Your electrician will calculate your total load to ensure the switch can handle your home’s energy demands.
Q: Do I need to maintain an ATS?
A: Minimal maintenance is required. Simply keep the area clean and have an electrician perform a visual inspection once a year.
Q: Can an ATS protect my solar panels?
A: The ATS protects your home’s circuits, not the panels themselves. You still need proper fuses and breakers for your solar array.
Q: Does an ATS work with net metering?
A: Yes, an ATS is designed to work alongside net metering by prioritizing your stored solar power while remaining connected to the grid.