125A Automatic Transfer Switch for Solar & Whole Home Backup Power (24–48 Circuits)

This 125A Automatic Transfer Switch is a high-capacity, advanced solution designed for whole-home backup power systems, solar integration, and grid-tie inverter setups. Built for seamless performance, it automatically transfers power from the utility grid to your backup system during outages—keeping your home or business powered without interruption.

Engineered for modern energy systems, this transfer switch is ideal for solar generators, AC-coupled battery systems, and grid-tie inverters. Its parallel power path design allows solar production to continue even when the grid is down, maximizing energy efficiency and backup performance.

Instant Automatic Power Transfer

This system continuously monitors utility power and automatically switches to backup power the moment an outage is detected. There is no need for manual intervention, ensuring uninterrupted operation of critical systems.

125A High-Capacity Power Handling

Designed for larger residential and light commercial applications, this transfer switch features a 125-amp bus bar, providing the capacity needed to support whole-home backup systems and higher load demands.

Broad System Compatibility

Compatible with solar generators, battery backup systems, grid-tie inverters, and traditional gas or diesel generators. Supports 120V, 120/240V, and 120/208V electrical configurations and works seamlessly with AFCI and GFCI breakers.

Grid-Tie Inverter Integration with Parallel Power Path

This advanced transfer switch creates a parallel power path for grid-tie inverters, allowing them to continue producing power during outages. Energy can be safely routed through the transfer switch into an AC-coupled battery system, maximizing solar utilization even when the grid is unavailable.

Expandable Circuit Capacity

Includes 24 circuit spaces and supports expansion up to 48 circuits using tandem breakers. This flexibility allows the system to grow with your energy needs, making it ideal for scalable solar and backup installations.

Weather-Resistant NEMA 3R Enclosure

Built with a rugged NEMA 3R-rated enclosure, this transfer switch is protected against rain, dust, and harsh environmental conditions. Suitable for both indoor and outdoor installations.

Advanced Control System with Manual Override

A centralized control console allows for system monitoring, testing, and manual override. This provides full control over your backup system and ensures easy maintenance and troubleshooting.

Certified for Safety and Code Compliance

Meets UL 1008 and CAN/CSA C22.2 No. 178.1 standards and is manufactured in compliance with ISO/IEC Guide 17067, ensuring safe and reliable operation in residential and commercial environments.

Common Use Cases

• Whole-home backup power systems
• Solar generator and battery backup integration
• Grid-tie solar systems with battery storage
• Hurricane and emergency power preparedness
• Off-grid and hybrid energy systems
• Light commercial and small business backup power

Why Choose This 125A Automatic Transfer Switch

• High-capacity 125A design for whole-home use
• Supports solar, battery, and generator systems
• Grid-tie inverter compatible for continued solar production
• Expandable circuit capacity up to 48 circuits
• Durable NEMA 3R enclosure for indoor/outdoor use
• Fully certified for safety and compliance

Frequently Asked Questions

What is a 125A automatic transfer switch used for?
A 125A transfer switch is used for whole-home or large backup systems, allowing seamless switching between utility and backup power for higher electrical loads.

Can this work with solar and grid-tie systems?
Yes, this transfer switch is specifically designed to work with grid-tie inverters and solar battery systems, allowing solar energy production to continue during outages.

How many circuits can it support?
It includes 24 circuits and can be expanded up to 48 circuits using tandem breakers.

Is this suitable for outdoor installation?
Yes, the NEMA 3R enclosure is weather-resistant and designed for both indoor and outdoor use.

Does it require manual switching?
No, this is a fully automatic system that detects outages and switches power instantly.

Is it safe and code compliant?
Yes, it meets UL 1008 and CSA standards and complies with major electrical safety regulations.

Key Features :

• 125A whole-home power capacity

• Works with solar, battery, and generators

• Grid-tie inverter compatible

• Expandable up to 48 circuits

• NEMA 3R weather-resistant enclosure

• Fully automatic operation