Sungrow, Sigenergy and iStore: what a mid-range system gets you

A mid-range solar and battery system is where most homes find the best balance of features and cost. Sungrow, Sigenergy and iStore each give you a hybrid inverter that runs a battery, an app to watch it, and a 10-year warranty on the main parts. Where they differ is in how the pieces fit together and how much room you have to grow.

Sungrow

Who they are. Sungrow is a Chinese company whose history goes back to 1997 in Hefei. It opened its first Australian office, in Sydney, in 2012.

How it works. Sungrow's home hybrid inverters, such as the SH RS single phase series, connect the panels, the battery and the home in one box on the wall. The matching SBR battery is a stack of modules, with models running from about 6.4 kWh up to 25.6 kWh, so a system can be sized to the household.

Warranty. Sungrow's Australian inverter warranty is 10 years from installation, capped at 11 years from the manufacture date. Its high voltage battery warranty is a 10-year product warranty. The battery's capacity guarantee comes with an energy throughput limit, so read the battery document for the exact model.

Monitoring. The iSolarCloud app shows production, use, battery level and grid flows.

What stands out. The longest track record of the three in Australia, and a wide spread of inverter and battery sizes.

Sigenergy

Who they are. Sigenergy is a much younger company, founded in Shanghai in 2022 and listed on the Hong Kong stock exchange in 2026. Its founder is a former Huawei solar executive, and the company puts a lot of weight on software.

How it works. The SigenStor is an all-in-one stack. An energy controller (the hybrid inverter) sits at the base and battery modules stack on top. The battery modules now come in four sizes (BAT 5.0, 6.0, 8.0 and 10.0), so the stack can grow over time. Sigenergy also sells DC car charging as a module that fits the same system.

Warranty. Sigenergy's Australian and New Zealand warranty lists 10 years for both the battery and the energy controller. The battery guarantee is at least 70% of usable energy for ten years, or a set amount of energy delivered, whichever comes first. Other parts, such as the EV charging module, have shorter terms.

Monitoring. The mySigen app, which runs the whole stack, including the battery and any car charging module.

What stands out. A tidy, modular stack that is easy to expand. The trade-off is a much shorter track record than Sungrow.

iStore

Who they are. iStore is an Australian-owned brand based in Western Australia. Like most inverters and batteries sold here, its products are made in China.

How it works. iStore offers single and three phase hybrid inverters and a modular battery built from 5 kWh packs. The battery works with a compatible hybrid inverter, so the inverter and battery are chosen together.

Warranty. iStore's Australian warranty lists 120 months (10 years) on its inverters. The battery warranty is 10 years, with an energy throughput limit per 5 kWh pack, and it requires the battery to stay connected to iStore's monitoring platform.

Monitoring. iStore's own monitoring platform and app.

What stands out. An Australian company to deal with and a neat, matched system. The catch is less flexibility in mixing brands later.

How they compare at a glance

• Inverter warranty: 10 years for all three under their Australian terms.
• Battery warranty: 10 years for all three, each with a capacity guarantee and an energy throughput limit.
• Expanding later: Sigenergy's stack is the most modular. Sungrow and iStore both use modular batteries too.
• Track record: Sungrow has the longest history in Australia. Sigenergy is the newest.
• Who stands behind them: Sungrow and Sigenergy are Chinese companies that publish warranty terms written for Australian buyers. iStore is Australian-owned, with its products made in China.

What a mid-range system gives up

Compared with a premium system, the main difference is the length of the warranty: 10 years here, against up to 15 years on our Premium tier. Compared with our Essential tier, the Balanced tier adds remote fault monitoring, so a problem is picked up early rather than when the power bill arrives.

A battery is also cheaper to add than it was. Under the federal Cheaper Home Batteries Program, eligible installs between 1 May and 31 December 2026 earn 6.8 STCs per usable kWh, falling to 5.7 from 1 January 2027.

Our Balanced tier

Central Solar's Balanced tier uses Sungrow, Sigenergy or iStore inverters with all-black panels, a 25-year panel warranty and remote fault monitoring. Every system is checked by an independent licensed Electrical Inspector. If you are weighing up a battery as well, see our home batteries page.