If you’re running a solar system—especially a hybrid or off-grid setup—you’ll eventually need an automatic transfer switch (ATS) to manage the flow of electricity between your solar power, battery storage, and a secondary source like the grid or a generator.
The right ATS ensures uninterrupted power, switches between sources instantly, and protects your system from overloads or failure.
In this guide, we’ll break down the best automatic transfer switches for solar power systems, what features you actually need, and how to pick the right one for your home, RV, or off-grid setup.
What Is an Automatic Transfer Switch for Solar?
An ATS automatically switches the source of power to your home or system when your primary source fails or changes.
In solar systems, it’s often used to switch between solar+battery and a backup generator or grid connection. This eliminates the need to manually unplug or rewire when solar isn’t sufficient—making your power system safer and smarter.
Benefits of Using an ATS in a Solar Setup:
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No manual intervention during power changes
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Prevents downtime during outages or low solar production
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Protects appliances from power surges or supply interruptions
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Supports seamless hybrid energy use (solar + grid or generator)
1. Go Power! TS-30 Automatic Transfer Switch – Best for RV and Mobile Solar Systems
This compact ATS is perfect for solar setups in RVs, campervans, or tiny homes that need to switch between shore power and inverter/solar power.
Quick Verdict:
Reliable and easy to install—perfect for 120V systems in mobile setups.
Key Features:
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30-amp capacity (120V)
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Automatically switches between inverter and generator/grid
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Built-in delay to prevent short cycling
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Compact, lightweight design
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UL listed for safety
Why It’s Ideal for Solar:
Go Power! TS-30 is a popular choice among solar RV owners. It ensures that when your battery/inverter runs low, the system automatically switches to generator or grid power—no flipping switches or unplugging cords.
2. Progressive Dynamics PD52V Transfer Switch – Best for High-Power Loads
If you’re managing a more powerful setup, such as a full-size motorhome or an off-grid cabin with multiple circuits, the Progressive Dynamics PD52V offers robust switching and high amperage.
Quick Verdict:
Heavy-duty, UL-listed transfer switch with fast switching and high reliability.
Key Features:
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240V, 50-amp rating
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Transfers between generator, inverter, and grid
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Time delay for generator startup
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Compact and rugged aluminum casing
Why It Works Well for Solar Systems:
For large inverters (3000W and up) or backup generators, this transfer switch offers fast and clean switching with proper load isolation. Ideal for hybrid solar setups with occasional generator use.
3. Reliance Controls Pro/Tran 2 Series – Best for Home Solar Backup Systems
If you’re backing up your home solar system with a generator or want to legally and safely tie into a home panel, Reliance Controls has a code-compliant solution.
Quick Verdict:
The go-to solution for home solar + generator users needing clean switching and code compliance.
Key Features:
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Manual/automatic switch options
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Up to 10 circuits (expandable)
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Available in 30A and 50A models
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Indoor or outdoor NEMA-rated enclosures
Why It’s a Top Choice:
Though primarily manual, many models include automatic functionality with interlock kits. It’s code-compliant in the UK and US and integrates directly with home panels—ideal for grid-tied solar users who want to use backup generators without violating safety codes.
4. AIMS Power 30A Transfer Switch – Best Budget-Friendly Option
For those looking for a low-cost yet effective transfer switch, AIMS Power offers a simple unit that handles basic solar/inverter/generator switching needs.
Quick Verdict:
Affordable, compact, and perfect for DIY solar installs or small cabins.
Key Features:
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30A, 120V system
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Works with inverter and AC input sources
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20–30 millisecond switch delay
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Hardwire-ready for fixed installations
Why It’s Great:
You don’t need a fancy programmable unit for a basic solar setup. This switch provides the functionality needed to toggle between solar/battery and backup AC power—at a fraction of the price of larger systems.
5. Midnite Solar MNE250SMA-240 – Best for Off-Grid SMA and Hybrid Systems
If you’re using SMA Sunny Island or other high-end hybrid solar inverters, this Midnite Solar ATS is engineered specifically for those systems.
Quick Verdict:
Commercial-grade switch built to work with advanced off-grid and hybrid solar inverters.
Key Features:
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240V, 250A capacity
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Compatible with SMA, Outback, and other high-wattage systems
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UL 1008 compliant
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Enclosure rated for harsh environments
Why It’s Premium:
This is a serious solar switch for those running multi-inverter systems, large battery banks, and generators. If you’re powering an off-grid homestead, lodge, or business, this is your best bet for safe, high-load solar switching.
What to Look For in a Solar ATS (Automatic Transfer Switch)
Here’s a simple breakdown of what matters most:
| Feature | Why It’s Important |
|---|---|
| Amperage Rating | Must match or exceed your inverter or AC input load |
| Voltage Compatibility | Match your system (120V or 240V, single or split phase) |
| Number of Circuits | Needed for whole-house or multi-load systems |
| Switching Speed | Faster = less disruption (20–50ms is standard) |
| Installation Type | Wall-mount, panel-integrated, or plug-and-play |
| UL or CE Listing | Ensures safety and compliance for home and commercial use |
| Delay Functions | Prevents issues during generator startup or surges |
Use Case Examples
| Use Case | Recommended ATS |
|---|---|
| RV/Camper Solar + Inverter | Go Power! TS-30 |
| Off-Grid Cabin + Generator | AIMS Power or Progressive Dynamics PD52 |
| Home Solar + Generator Backup | Reliance Controls Pro/Tran 2 |
| High-Power Hybrid System | Midnite Solar MNE250SMA |
| Budget DIY Solar Setup | AIMS Power 30A |
Conclusion
An automatic transfer switch is essential for a seamless, safe solar system—especially if you’re relying on multiple power sources like batteries, inverters, and generators. It ensures you’re never left in the dark and that your loads are protected from sudden outages or supply fluctuations.
To recap the best ATS for solar:
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Go Power! TS-30 – Best for RVs and portable solar setups
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Progressive Dynamics PD52V – Best for large off-grid inverters
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Reliance Controls Pro/Tran 2 – Best for home solar and generator users
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AIMS Power 30A – Budget-friendly and functional
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Midnite Solar MNE250SMA – Best for high-end hybrid/off-grid systems
Ready to protect and automate your solar system? Choose an ATS that fits your power rating, application type, and solar configuration. Once installed, you’ll enjoy truly worry-free power—day or night.
Need help choosing the right ATS for your inverter or battery bank? Drop your system specs in the comments—we’ll help you match the perfect unit.