Can I start small and add capacity later?

Yes — the modular design is built around this. Confirm with your installer at the time of the original install that there is physical space and inverter headroom for additional modules later, since retrofitting can be more expensive than planning for it upfront.

What chemistry is this, and why does it matter?

It uses lithium iron phosphate (LFP), which we cover in detail in our LFP vs NMC battery chemistry comparison — in short, it favours long cycle life and thermal stability over the higher energy density of NMC chemistry.

Research-based pick — not personally tested

Sold in Australia

BYD Battery-Box Premium HVS

A stackable, modular LFP home battery from BYD, sold across Australia and Europe and CEC-approved for Australian installs. The modular design lets an installer size the system to 5.12, 7.68, 10.24 or 12.8kWh of usable capacity using the same 2.56kWh building block.

Specs

modular: true
chemistry: LFP (lithium iron phosphate)
warranty years: 10
module capacity kwh: 2.56
round trip efficiency pct: 96
usable capacity kwh options: 5.12,7.68,10.24,12.8

Pros

LFP chemistry, the same family we recommend for stationary home storage in our chemistry guide
Genuinely modular, so capacity can be expanded later by adding modules
10-year product warranty and CEC-approved for Australian installs

Cons

Higher-capacity configurations get physically large and need real wall space
Exact AU pricing is installer-quoted, not a fixed retail figure
Voltage range varies by configuration, so compatible inverters must be confirmed at design stage

Common questions

Can I start small and add capacity later?: Yes — the modular design is built around this. Confirm with your installer at the time of the original install that there is physical space and inverter headroom for additional modules later, since retrofitting can be more expensive than planning for it upfront.
What chemistry is this, and why does it matter?: It uses lithium iron phosphate (LFP), which we cover in detail in our LFP vs NMC battery chemistry comparison — in short, it favours long cycle life and thermal stability over the higher energy density of NMC chemistry.