Choose your SA Subsidy Home Battery System

Suntrix is pleased to offer you a choice of products from leading battery brands. The SA Government Battery Scheme provides a 9 week priority period for products manufactured or assembled in South Australia. The Sonnen and Alpha-ESS batteries are included in the 9 week priority period.

The table below provides information to help you determine the best battery storage solution to meet the unique requirements of your home so you can get the most out of your battery.  Our battery prices start from just over $9,000 so you will have out-of-pocket expenses to cover after your subsidy has been applied; however, as part of the scheme, the Government is offering low-cost finance to cover the gap.

Recommended PV size It’s important to have the right size solar system on your roof so you can achieve year-round performance from your battery.  We’ve provided some recommendations based on a typical home’s solar and battery requirements.
Minimum PV size This is the minimum size solar system recommended for each battery.  Your battery should typically perform well in summer but would provide minimal battery storage in winter. You may choose to upgrade your solar system as part of the battery installation to get better results year-round.
Back-up capacity All the batteries provide backup during a blackout but some will power more devices than others. Eg. the Alpha-ESS and Tesla can power 5kW in total which could include your LED lighting, televisions and washing machine
Back-up switching time When a blackout occurs, some batteries take longer than others to switch over and restore power to your home. Eg. the Alpha-ESS acts as an Uninterrupted Power Supply (UPS) whereas your home may lose power momentarily with the other batteries
Back-up capability Some batteries can only charge from your solar system whilst there is grid-power to your house (ie. not during a blackout)
Rated inverter power This shows how fast your battery can charge and discharge. Eg. the Alpha-ESS and Tesla batteries will charge faster than the Sonnen battery
Smart weather forecasting Some batteries have technology to forecast severe weather events and automatically increase the amount of energy stored in the battery, so you will have more power available if a blackout occurs due to the weather event.
Warranty Batteries have product and performance warranties and they can differ amongst battery suppliers.  Some performance warranties are based on a time period and others are determined by cycles (a Sonnen cycle is a full charge and discharge of the battery).
IP protection According to the CEC guidelines for the installation of battery energy storage systems, any equipment exposed to an outdoor environment must be at least IP 54. Hence the Sonnen battery must be installed indoors (eg. a garage)


Battery cell technology Lithium Iron Phosphate (LiFePO4/LFP)
Lithium Iron Phosphate (LiFePO4/LFP)
nickel manganese cobalt (NMC)
Model Eco 8.2/6 Eco 8.2/8 Eco 8.2/10  Smile 5/5.7 Smile 5/11.4 Smile  5/17.1 Powerwall 2
Usable battery capacity (kWh) 6 8 10  5.5 11 17.5 13.5
Recommended PV size 3.6 4.8 6 3.3 6.6 9.9 8.1
Minimum PV size 1.8 2.4 3 1.65 3.3 4.95 4.05
Rated inverter power (kW) 2.5 2.5 2.5 5 5 5 5
Weight (kg) 137 162 187 125 190 255 125
Dimensions (h/w/d) 137/64/22 137/64/22 137/64/22 120/60/25 180/60/25 180/120/25 115/75.5/15.5
Smart weather forecasting Yes Yes Yes No – manual reserve adjustment Yes
Back-up capacity Yes – single phase. Low power devices only Yes – single phase. 5kW max load Yes – single phase. 5kW max load
Back-up switching time Almost uninterrupted power supply Uninterrupted power supply Almost uninterrupted power supply
Back-up capability Cannot charge from solar system during blackout Can charge from solar system during blackout (provided solar is connected to internal inverter) Can charge from solar system during blackout (provided external inverters are single phase)
Electricity supply 1/2/3 phase compatible 1/2/3 phase compatible 1/2/3 phase compatible

IP protection
IP21 (Indoor) IP65 (Outdoors & Indoors) IP65 (Outdoors & Indoors)

Product Warranty
10 years 5 years 10 years
Performance Warranty  10 years or 10,000 cycles (whichever comes first) 10 years to 80% capacity 10 years to 70% capacity

Subsidy* available (all households)
$3000 $4000 $5000 $2850 $5700 $6000 $6000

* The subsidy is calculated on the kilowatt hour capacity of the battery purchased – $600 per kilowatt hour (kWh) for energy concession holders and $500 per kilowatt hour (kWh) for all other households. While the subsidy will vary depending on the size of the battery, it is capped for everyone at a maximum of $6,000 per battery installed.