The Complete Guide to Integrating ACS with Solar PV and Inverter Systems

Alt-text: Wide rooftop solar panel installation at sunset, symbolizing solar energy integration

When adding solar PV and inverters to your power setup, an automatic changeover switch for solar system makes life much safer and easier. It seamlessly shifts between grid and solar power—or solar and inverter—without manual intervention, protecting your equipment and simplifying installation.

TOSUNlux solar PV ATS units provide essential safety features, precise control, and durable construction. With options for single-phase and three-phase applications, they serve as the reliable core of any integrated power system.

EP Changeover Switch

Reliable and compact, TOSUNlux EP Changeover Switch enables smooth power source transition, ideal for backup systems and industrial panels.

View Product

Why You Need an Automatic Changeover Switch

Connecting solar or inverter output directly into your main panel isn’t safe. Without proper isolation, you risk backfeeding the grid, damaging equipment, or endangering utility workers. 

A proper ac dc automatic changeover switch ensures only one power source is active at a time, making transitions safe and compliant.

electrical supply wholesaler

Discover a full range of electrical products from a trusted electrical supply wholesaler. TOSUNlux offers circuit breakers, contactors, switches, and more for global markets.

View Product

How It Works with Solar and Inverters

A changeover switch monitors two sources—for example, solar inverter and main grid. When solar power is sufficient, it directs energy from the inverter to your loads. 

As panels lose output (like at dusk), the switch detects the drop and flips to grid power within milliseconds. If you have batteries connected, it can switch between solar/battery and grid based on your settings.

This automation takes the guesswork out of hybrid systems and prevents damage or interruption during switchover.

Single-Phase vs. 3-Phase Usage

In single-phase systems (typical for homes), you only need to switch one live and neutral line. For higher-power solar setups in offices or light industry, a 3 phase automatic changeover switch directs energy across three live lines simultaneously, ensuring balanced load and safe transitions.

For example, TOSUNlux offers solar-ready ATS units in both configurations—complete with LEDs, phase detection, and secure DIN rail or panel installation.

Choosing the Right Model

When sizing and selecting a solar changeover switch, consider:

• Phases needed: Single-phase (up to ~230 V) or three-phase (380–480 V).
• Current rating: Match or exceed the inverter’s output amperage.
• Switching speed & delay: You don’t need UPS-level speed, just a clean transition.
• AC vs. DC switching: For PV panel isolation, you need a dedicated DC voltage surge protector; your ATS handles the AC side.

Source: The Surge Protection Device

TOSUNlux’s combo-ready ATS units include AC changeover plus optional DC protection modules for end-to-end integration.

Typical Installation Flow

Here’s how a basic solar + inverter + ATS setup comes together, step-by-step:

Install your solar PV and inverter system

Begin by mounting the panels, wiring the inverter, and confirming the output specifications. Make sure everything complies with your local grid code.

Place the automatic changeover switch for the inverter

The ATS should sit between your inverter’s AC output and the main distribution board. It acts as the gatekeeper, deciding when to use solar or grid power.

Configure the timing and priority settings

Many modern ATS units allow you to program delays—like how long to wait before switching over when solar drops off. TOSUNlux models include digital displays to make this easy.

Add surge and overvoltage protection (if needed)

Especially if you’re in an area with unstable voltage or lightning risk, it’s smart to pair your setup with a DC voltage surge protector for the PV side and AC protection for the load side.

Run full transition tests

After everything’s connected, simulate a solar drop (cover a panel or disconnect the inverter briefly) and verify the ATS switches to grid power smoothly. Then test the return.

Benefits of TOSUNlux Solar ATS Units

TOSUNlux doesn’t just build generic switches. Our automatic changeover switch for solar systems is purpose-built for real-world solar and inverter setups—whether residential or industrial. Here’s what sets them apart:

• Tailored for solar
  Each unit is clearly labeled and optimized to handle switching between solar inverters, batteries, and the grid. You know exactly what’s going where.
• Single-phase and 3-phase options
  Whether you’re powering a home or running a commercial facility, TOSUNlux has a unit that matches your voltage and load needs—without overcomplicating the install.
• Built for durability
  Expect industrial-grade materials, reliable switching mechanisms, and solid terminal connections designed to withstand daily cycling and heat buildup.
• Easy to maintain and expand
  Modular design means you can upgrade or replace components without starting from scratch. Plus, the front panels and wiring points are easy to access and service.

With TOSUNlux, you’re not just buying a switch—you’re getting a long-term piece of your energy strategy that can grow with your setup.

Check out our website or contact us today for a quote!