Gridly
Overview
Three-phase residential power supply is less common in Australia than single-phase - most suburban homes built before 2010 have single-phase connections. But three-phase supply is standard in:
- Newer housing developments (many developers install three-phase as standard in estates from ~2015 onward)
- Larger rural and lifestyle properties
- Homes with commercial-grade equipment: large solar arrays, 3-phase HVAC, workshops
- Properties that have specifically upgraded to support high-draw installations
For these homes, single-phase batteries - even the SP at 12kW - impose an artificial ceiling. A three-phase battery system can distribute loads across all three phases, utilise three-phase grid connection for faster solar charging, and provide genuinely unconstrained backup capability.
The SigenStor TP is, as of 2026, the only residential battery in Australia that delivers high three-phase output - up to 25kW - in a product certified and available through the Australian installer market.
Why three-phase matters for storage
Single-phase batteries connected to a three-phase home create phase imbalance. The battery only offsets loads on the phase it’s connected to; loads on the other two phases are not offset and draw from the grid regardless of battery state. This wastes a significant portion of the battery’s value in a three-phase home.
The SigenStor TP connects to all three phases simultaneously. Solar generation, battery charging, and backup output are all distributed across the three-phase system. The result:
- Solar self-consumption improves because generation can offset loads on any phase
- Battery cycling is more efficient because the system draws and supplies across the full electrical system
- Backup capability covers all three phases, not just one
For three-phase homes, a three-phase battery system is materially more effective than a single-phase battery of equivalent rating.
The SP recall and TP status
The November 2025 ACCC voluntary recall applied exclusively to SigenStor SP (single-phase) energy controllers. The TP hardware was not affected and was not subject to recall.
This matters for buyers evaluating the Sigenergy brand post-recall. The SP recall created negative press for Sigenergy broadly - but from a hardware perspective, the TP’s issue history is clean. Buyers specifically interested in three-phase storage can evaluate the TP without the recall concern that applies to the SP.
25kW output: who actually needs it
For most three-phase homes, 10kW three-phase is the practical operating point. A large Australian home at full load - ducted AC, multiple appliances, EV charging - rarely sustains more than 10–15kW continuously. The 25kW maximum is relevant for:
- Small farms and rural properties with three-phase irrigation pumps, workshop equipment, or commercial refrigeration
- Large homes with multiple EV chargers running simultaneously
- Properties running three-phase industrial equipment that requires high instantaneous power
The configurable output (10, 15, or 25kW) means you set it to what your property actually needs rather than over-specifying unnecessarily. The additional power capability is a ceiling that can be raised if requirements grow, not a fixed spec you’re paying for regardless of use.
Comparison with three-phase alternatives
The honest comparison is limited because there is no direct Australian residential competitor at this output in the three-phase segment. The closest alternatives for three-phase homes:
| Sigenergy TP 16kWh | Two Powerwall 3 units (~27kWh) | Fronius Reserva 15 (per phase) | |
|---|---|---|---|
| Three-phase output | 10–25kW native | 23kW (split) | Requires 3 inverters |
| Supply price | ~$9,200 | ~$24,000 | Complex multi-system |
| V2H | Yes (module) | No | No |
| 5-in-1 integration | Yes | No | No |
The Sigenergy TP is substantially more cost-effective for three-phase capability than stacking multiple single-phase systems. The main alternative - two Powerwall 3 units - costs more than twice as much for comparable output without V2H capability.
Who should buy the SigenStor TP
The TP is for three-phase Australian households that want the highest available battery output without stacking multiple expensive single-phase systems. The $9,200 supply price represents genuine value for three-phase capability that alternatives cannot match at any comparable price.
It requires three-phase supply - if you have single-phase, the SP is the appropriate product. It requires Sigenergy ecosystem commitment - if inverter flexibility matters, look elsewhere. For buyers with three-phase supply who want capable whole-home backup with V2H potential, the TP is the strongest available option in the Australian market as of 2026.
