Solar battery storage

BYD Battery Box

A high-voltage modular battery system from the world’s largest battery manufacturer. Pairs natively with the Fronius Gen24 inverter for a clean, efficient DC-coupled storage solution. No inverter replacement needed if you already have a Fronius Gen24 in place.

5.1 to 22.1 kWh

Per stack

2.56kWh

Per module

IP55

Dust and water rated

96%

Round-trip efficiency

What the BYD Battery Box includes

A proven battery paired with Australia's most trusted inverter

The BYD Battery Box is a battery-only system, which means it works alongside a compatible hybrid inverter rather than including one of its own. Paired with the Fronius Gen24, it creates a DC-coupled system that charges directly from your solar panels before any energy conversion losses occur. If you already have a Fronius Gen24 installed, adding BYD storage is the most straightforward and cost-effective retrofit path available.

High-voltage LFP battery modules

Cobalt-free lithium iron phosphate modules in 2.56kWh increments, stackable from 5.1kWh up to 22.1kWh per tower. Multiple towers can be connected in parallel for larger capacity installations.

DC-coupled efficiency

As a DC-coupled system, the BYD Battery Box charges directly from your solar panels before conversion to AC. This reduces energy losses compared to AC-coupled systems and maximises the amount of solar generation you actually store.

Fronius Gen24 native integration

The Fronius Gen24 hybrid inverter manages all charging, discharging and energy management for the BYD battery. The combination is one of the most established and field-proven solar and battery pairings available in Australia.

Modular and expandable

Start with the capacity you need now and add modules later as your energy requirements grow. There is no need to replace existing hardware when expanding — new modules simply add to the existing stack.

Plug-and-play module design

BYD’s patented internal plug architecture eliminates inter-module wiring during installation. Modules connect directly to each other within the tower, simplifying installation and future expansion.

Safety and durability

Built to the highest safety standards

Cobalt-free LFP chemistry

Lithium iron phosphate is the safest and most thermally stable lithium chemistry available for home storage. BYD’s cobalt-free formulation removes one of the key materials associated with thermal runaway risk in older battery chemistries.

VDE 2510-50 certified

The BYD Battery Box meets the VDE 2510-50 safety standard, one of the most stringent battery safety certifications available. BYD has earned multiple international safety and quality awards across the HVS and HVM range.

High-voltage series design

High-voltage DC architecture delivers efficient charge and discharge performance with lower current draw compared to low-voltage systems. Lower current means less heat generation and longer component life.

IP55 rated

Rated IP55 for protection against dust and water jets. Suitable for installation in garages, utility rooms and sheltered outdoor locations common in North Queensland homes.

10-year warranty

BYD provides a 10-year product and performance warranty across the HVS and HVM range, guaranteeing at least 60% usable energy retention over the warranty period.

96% round-trip efficiency

For every 100kWh of solar energy you store in the battery, you get 96kWh back out. This is among the highest round-trip efficiency ratings available for residential battery storage.

Who the BYD Battery Box suits

The natural battery choice for Fronius Gen24 owners

The BYD Battery Box is not the right fit for every situation. It requires a compatible hybrid inverter and does not include one of its own. But for Fronius Gen24 owners, it is the cleanest and most cost-effective way to add storage to an existing system without touching the inverter. For new installations, a Fronius Gen24 and BYD combination is a well-established and field-proven pairing that we are confident in recommending.

Best for: existing Fronius Gen24 owners

If you already have a Fronius Gen24 hybrid inverter, the BYD Battery Box is the most straightforward storage addition available. No inverter replacement, no additional equipment. The Gen24 manages the battery natively.

Best for: new solar and battery installs

For homeowners starting fresh, a Fronius Gen24 paired with BYD storage is a proven combination. The Fronius inverter handles all energy management, and the BYD battery can be expanded in future as your needs grow.

Best for: homeowners wanting to start smaller and expand

The BYD modular architecture is one of the most flexible available. You can start with a smaller capacity at a lower upfront cost and add modules later, making it a good fit for households that want to grow their storage over time.

Federal rebate

Cheaper Home Batteries Program

The BYD Battery Box is eligible for the federal Cheaper Home Batteries Program, which provides an upfront discount on the installed cost. The rebate applies to both new solar and battery installs and to retrofits on existing solar systems that do not yet have storage.

The exact rebate value depends on battery size and adjusts periodically. We apply it directly to every quote so you can see your actual cost upfront.

Specifications

Technical specifications

System type

Battery only (requires inverter)

Recommended inverter

Fronius Gen24

Battery chemistry

Cobalt-free LFP

Module size

2.56kWh per module

HVS capacity

5.1kWh to 12.8kWh per stack

HVM capacity

8.3kWh to 22.1kWh per stack

Coupling type

DC coupled

Round-trip efficiency

96%

EV charging

IP rating

IP55

Warranty

10 years

Retrofit compatible

Yes, no inverter change with Fronius Gen24