Gridly
Overview
Sigenergy is a Chinese company that entered the Australian market with the SigenStor - a vertically integrated system that combines the solar inverter, battery power conversion, EV charging interface, energy management, and battery hardware into one product. The integration model was the point of differentiation: buying a SigenStor means buying one system, not assembling compatible components from multiple manufacturers.
The SP is the single-phase version. Its headline specification - 8–12kW configurable continuous output - is genuinely unmatched in Australian single-phase residential storage. The closest competitor at 11.5kW is the Tesla Powerwall 3, which requires a Tesla inverter and costs $12,000 for 13.5kWh. The SP at $7,700 for 16kWh with 12kW output makes a strong case on specification-per-dollar.
The recall is the obvious starting point for any serious evaluation.
The recall: what happened and where things stand
On 19 November 2025, the ACCC issued a voluntary recall for SigenStor SP energy controllers installed in Australia. The root cause: the AC quick-connect plugs used in the energy controller required ferrules (wire end caps) and crimping to ensure secure electrical connections. When installers did not properly crimp and ferrule these connections - a training and specification issue - the plugs developed high resistance under sustained high-load operation, causing overheating, melted connectors, and at least one small fire.
This is a design risk that Sigenergy attributed to “installation practices.” The industry assessment from solar installers and commentators was more critical - a product should not rely on perfect installation for safety; the design should be tolerant of installation variance.
The interim mitigation was firmware that throttled maximum sustained output to below the level at which plug overheating occurred. The permanent fix was a redesigned energy controller with plug connections that don’t require ferrules or crimping.
For buyers evaluating the SP today:
- New-stock units incorporate the redesigned connections
- Already-installed units were being issued replacement controllers in Q1 2026
- The firmware throttle remains active until the controller replacement is installed on affected units
The recall was serious - a small fire is serious. The response - free replacement hardware plus 2-year warranty extension for affected customers - reflects appropriate accountability. Whether the recall disqualifies the SP as a purchase depends on how you weigh resolved versus ongoing risk.
12kW output: the real-world case
Most residential battery backup discussions assume “essential loads only” - refrigerator, lighting, internet, one split system. The SP’s 12kW continuous output changes that assumption.
At 12kW, a large Australian home can run simultaneously:
- Ducted reverse-cycle air conditioning: 3–5kW
- Electric oven: 2–3kW
- Hot water heat pump: 1.5–3kW
- All other household loads: 1–2kW
This is not load-shedding backup - it is the full home load maintained during a grid outage. The 12kW configurable ceiling is what justifies the SP’s market position against competitors with fixed 5–6kW ratings.
V2H: available now, not on a roadmap
Unlike FranklinWH (where V2H is on a roadmap) or most other batteries (which have no V2H capability), the Sigenergy 25kW bidirectional DC module provides genuine V2H in Australia today. The EV battery becomes a home battery that charges and discharges through the home’s energy management system.
At 25kW bidirectional, a compatible EV with a 70kWh battery can provide approximately 56kWh of usable storage (at 80% DoD) - more than double the home battery’s 16kWh. For households with a compatible V2H EV, the system becomes substantially larger than the hardware spec suggests.
Compatible EVs and confirmation of regulatory status in your state should be verified with your installer.
Who should buy the SigenStor SP
The SP is the right choice for single-phase households that want the highest continuous output available in Australian residential storage, are interested in V2H capability, and are comfortable with the post-recall status of the product. The recall was handled with appropriate remediation; post-design-change units resolve the root cause.
Buyers for whom the recall remains a concern despite the resolution should consider the Powerwall 3 (11.5kW output, Tesla ecosystem, $12,000) as the alternative in this output tier.
