What the Growatt SYN 100 XH 30 is

Growatt SYN 100 XH 30 is an automatic transfer box for larger three-phase Growatt battery-ready systems. Its role is to move the installation from normal on-grid operation into backup operation when the grid fails, allowing critical loads to remain energised from the wider solar-and-battery system. Growatt officially lists the product as an automatic transfer box and identifies MOD XH and MID XH compatibility on the product page.

For the kind of sites that use MID-XH equipment, backup is often more than a convenience feature. These projects can include larger homes, farm buildings, workshops, offices or mixed-use sites where an outage is a genuine operational problem. That is why a more capable backup interface matters. The SYN 100 XH 30 exists for those larger three-phase backup requirements.

Who it suits

The SYN 100 XH 30 suits larger three-phase residential and commercial-style sites using Growatt MID-XH battery-ready systems, and it is also officially listed by Growatt with MOD XH compatibility. It is particularly relevant where the project needs a more capable backup path than the smaller SYN 50 XH 30 can provide and where selected critical loads need continuity during outages.

It also suits sites where phase behaviour and system control matter. Growatt’s published feature list includes 100% three-phase imbalance output, which is valuable on real installations where backup circuits are rarely distributed evenly.

Key features and practical benefits

• Automatic transfer box for Growatt MOD XH and MID XH platforms.
• Backup power up to 40kW.
• On and off grid mode switch time in 0.5 seconds.
• 100% three-phase imbalance output.
• Integrated breaker for easier installation.
• RS485 communication.
• Manual control bypass switch.
• IP65 protection rating.
• Natural convection cooling.
• Wall-mounted installation.
• Published datasheet dimensions 365 x 486 x 120mm.
• Published datasheet weight 12kg.

The first major benefit is capacity. At up to 40kW backup capability, the SYN 100 XH 30 sits in a different class from smaller residential backup accessories. The second benefit is control. Manual bypass, RS485 communication and integrated breaker all help position the product as a serious part of the system architecture rather than a simple switching accessory.

The third advantage is its ability to work with real three-phase loads. Growatt’s 100% three-phase imbalance output claim matters because actual critical-load groups are often uneven. A backup interface designed with that reality in mind is much more useful than one built around idealised perfectly balanced loads.

Technical details that matter in practice

Growatt’s official SYN 100-XH-30 product page states backup power up to 40kW, on/off grid mode switch time in 0.5 seconds, 100% three-phase imbalance output and integrated breaker. The official datasheet adds RS485 communication, manual control bypass switch, natural convection cooling, noise below 30dB, operating temperature from -40°C to 60°C, IP65 protection, wall mounting, 12kg weight and 365 x 486 x 120mm dimensions.

Those details matter because they show the SYN 100 XH 30 is built for serious three-phase backup applications rather than light residential duty alone. The capacity, bypass facility and environmental rating all help the product fit properly into larger technical designs where continuity really matters.

How it fits into the wider Growatt system

Growatt’s wider configuration material places SYN 100-XH-30in the MID 11-30KTL3-XH path, alongside APX HV battery configurations. The official product centre also lists MID XH and MOD XH compatibility. That makes the SYN 100 XH 30 particularly relevant where the system is already part of the larger Growatt battery-ready ecosystem rather than a simple stand-alone inverter install.

For the owner or specifier, that means the backup box can be considered as part of a broader energy-resilience strategy. It does not just help keep a few domestic circuits alive. It can become part of a more serious three-phase design intended to protect operational continuity across a larger site.

Installation considerations

Because the SYN 100 XH 30 sits on larger and more capable systems, installation planning matters. The backup box should be specified around actual critical-load requirements, the inverter and battery combination installed, and the site’s three-phase load behaviour. The official datasheet’s manual bypass switch is useful from a service perspective, while RS485 communication supports better integration into the wider Growatt logic.

IP65 protection and wall-mounted design also support practical installation flexibility. For plant rooms, service spaces and suitable sheltered outdoor positions, those traits help make the product easier to specify cleanly as part of a professional three-phase storage-backed system.

Why this variant may be the right choice

The SYN 100 XH 30 is the right Growatt choice when the project is too substantial for the smaller SYN 50 XH 30 and needs the larger backup path associated with MID-XH-class systems. Compared with the smaller backup box, it provides much greater backup capacity and a more appropriate fit for larger three-phase sites. Compared with leaving the system without an official backup interface, it gives a much clearer route to controlled outage resilience within the Growatt ecosystem.

That makes it especially valuable on larger homes, farms, commercial units and technical sites where maintaining power to selected loads during an interruption is a core part of the system brief.

FAQ

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