Truly modular — start from 5.1 kWh
Begin with a single 5.1 kWh PowerOcean battery and expand at any time up to 45.9 kWh on one inverter, for a flexible upfront investment that grows with you.
Solar Battery·EcoFlow
EcoFlow PowerOcean Three-phase — Modular Home Solar Battery
The EcoFlow PowerOcean Three-phase is a high-voltage, modular home solar battery system built around EcoFlow’s PowerOcean LFP battery and a three-phase hybrid inverter. Each battery pack has its own built-in DC-DC converter, so packs can be added and work together seamlessly — letting you start small and expand whenever you like.
It is designed for three-phase Australian homes that want a flexible upfront investment and room to grow. You can begin with a single 5.1 kWh battery and expand at any time up to 45.9 kWh on one inverter, adding capacity as your needs change. With up to 12 kW of backup, the system can keep your home — including three-phase appliances — running through a grid outage.
This page explains what the PowerOcean Three-phase is, who it suits, every key specification, what those numbers mean for your home, and the technical terms behind them, so you can decide with confidence before requesting a quote from Sunbridge Energy.
Why choose the EcoFlow PowerOcean Three-phase
Built-in DC-DC converter in every pack
Each battery pack carries its own DC-DC converter, so packs of different ages work together and the three-phase inverter operates efficiently as you expand.
Three-phase backup up to 12 kW
The inverter integrates a backup module that delivers up to 12 kW during an outage and supports three-phase and unbalanced loads — not just a few essential circuits.
High-voltage 800 V architecture
An 800 V high-voltage battery means lower current for the same power, which reduces losses and supports efficient charging and discharging.
LFP safety and long life
PowerOcean uses LFP (lithium iron phosphate) chemistry, rated for 6,000+ cycles before dropping to 70% capacity — thermally stable and built to last.
15-year warranty
EcoFlow backs the PowerOcean battery with a 15-year warranty guaranteeing at least 70% capacity after 15 years or 6,000 cycles, whichever comes first.
Who the EcoFlow PowerOcean Three-phase is for
Three-phase homes
Larger or all-electric Australian homes on a three-phase supply that need a battery designed for three-phase from the ground up, with backup across all phases.
Start small, grow later
Households that want a lower upfront cost now and the freedom to add battery packs over time as their budget or energy needs grow.
Blackout protection
Homes that want dependable backup — up to 12 kW, including support for three-phase and unbalanced loads — during storms or grid outages.
High solar self-consumption
Households with solar who want to store more daytime generation and rely on the grid as little as possible across the evening peak.
EV-charging households
Homes adding an electric vehicle that want to charge from stored solar in the evening instead of drawing expensive peak grid power.
Safety-focused buyers
Buyers who prioritise the thermal stability and long life of LFP chemistry in a premium, outdoor-rated package.
Key specifications
Battery
- Chemistry
- LFP (LiFePO₄)
- Battery pack
- EF BD-5.1-S1 (5.1 kWh nominal each)
- Nominal capacity
- 5.1 / 10.2 / 15.3 / 20.4 kWh (per inverter)
- Usable capacity (95% DoD)
- 4.8 / 9.7 / 14.5 / 19.4 kWh
- Depth of discharge (DoD)
- 95%
- Maximum capacity
- Up to 45.9 kWh per inverter
- Nominal battery voltage
- 800 V (high-voltage)
- Cycle life
- 6,000+ cycles (to 70% capacity)
- Battery ingress protection
- IP65
Inverter & power
- Inverter type
- Three-phase hybrid
- Rated power
- 6 / 8 / 10 / 12 kW
- Max. PV input
- 10 / 12 / 14 / 16 kW
- Operating temperature
- −20 °C to +50 °C
- Inverter ingress protection
- IP65
Backup & system
- Backup output
- Up to 12 kW
- Three-phase appliance support
- Yes
- Unbalanced load support
- Yes
- Expansion
- Start from one battery, expand at any time
Monitoring & warranty
- Monitoring
- EcoFlow app and web portal
- Product warranty
- 15 years
- Performance warranty
- ≥ 70% capacity at 15 years or 6,000 cycles
Specifications are based on the EcoFlow PowerOcean (Three-phase) datasheet and the EcoFlow PowerOcean Limited Warranty for Australia & New Zealand. Exact figures depend on the chosen configuration; Sunbridge will confirm the right setup for your home.
What the numbers mean for your home
95% depth of discharge
Depth of discharge (DoD) is how much of the battery you can use. At 95% DoD you can draw most of the battery — about 4.8 kWh of usable energy from each 5.1 kWh pack — while keeping a small reserve that helps protect long-term battery health.
800 V high-voltage architecture
A higher battery voltage means less current flows for the same power. That reduces resistive losses in the wiring and electronics, supporting efficient charging and discharging.
Built-in DC-DC converter per pack
Because each pack manages its own voltage, you can mix packs added at different times and expand the system later without replacing what you already own.
Start from 5.1 kWh, expand to 45.9 kWh
You can buy only the capacity you need today and add more packs later, spreading the investment instead of paying for a large battery up front.
Up to 12 kW three-phase backup
During a blackout the system can run substantial loads across all three phases, so three-phase appliances like some air conditioners and pumps keep working, not just a few power points.
6,000+ cycle life
One cycle is roughly one full charge and discharge — about a day of use. At 6,000+ cycles before reaching 70% capacity, the battery is built for many years of daily cycling.
A deeper look at the technology
Modular storage that grows with you
PowerOcean is built around stackable 5.1 kWh battery packs, each with its own DC-DC converter. You can start with a single pack and add more at any time, up to 45.9 kWh on a single inverter, so your battery can grow with your household, your solar array or your move toward an electric home.
Because every pack manages its own voltage, packs bought at different times work together — you are not locked into buying all your capacity on day one, and you are not forced to replace existing packs when you expand.
Three-phase backup for the whole home
Many batteries only back up a few essential circuits. PowerOcean’s three-phase hybrid inverter integrates a backup module that delivers up to 12 kW and supports three-phase and unbalanced loads. That means more of your home — including three-phase appliances — can keep running during an outage.
Combined with stored solar, the system can carry a household through the evening peak and short outages, and reduce how much expensive peak-time grid power you draw.
LFP safety, built for Australian conditions
PowerOcean uses LFP (lithium iron phosphate) chemistry, the most thermally stable mainstream lithium chemistry and the standard choice for safety-conscious home storage. The battery and inverter are rated IP65 for outdoor installation and operate from −20 °C to +50 °C.
With a high-voltage 800 V architecture and a cycle life of 6,000+ cycles before dropping to 70% capacity, PowerOcean is engineered for efficient, dependable performance over many years.
A closer look
Key terms explained
Shopping for a home battery means wading through technical jargon. Here is what the most important terms on this page actually mean.
kW vs kWh
A kilowatt (kW) measures power — how much the system can deliver at any instant. A kilowatt-hour (kWh) measures energy — how much it can store or deliver over time. A 10 kW / 20 kWh system can push 10 kW and hold 20 kWh, roughly enough to run a 10 kW load for two hours.
LFP (LiFePO₄)
Lithium iron phosphate, a lithium battery chemistry prized for thermal stability, safety and long cycle life. It is the preferred chemistry for residential storage.
Hybrid inverter
A single inverter that manages solar panels, the battery and the grid together, rather than needing separate solar and battery inverters.
High-voltage (HV) battery
A battery built from many cells in series to reach a high system voltage (often 400–800 V). Higher voltage means lower current for the same power, which reduces losses and can improve efficiency.
Depth of Discharge (DoD)
How much of a battery’s capacity you can safely use. 95% DoD means 95% of the rated capacity is usable; 100% means all of it.
Usable vs nominal capacity
Nominal capacity is the battery’s total energy on paper; usable capacity is what you can actually draw after the DoD limit. Always compare batteries on usable kWh.
Cycle life
The number of full charge-and-discharge cycles a battery can perform while staying within its warranty performance. Roughly one cycle per day of normal use.
Round-trip efficiency
The share of energy you get back out of the battery compared with what you put in. Higher efficiency means less energy lost as heat during storage.
C-rate (1C)
How fast a battery charges or discharges relative to its capacity. 1C means it can charge or discharge its full capacity in about one hour.
MPPT
Maximum Power Point Tracking — circuitry that constantly tunes each solar string to extract the most power. More MPPTs let panels on different roof faces perform independently.
Three-phase vs single-phase
Single-phase supply has one active wire and suits most smaller homes; three-phase has three and suits larger or all-electric homes with heavier loads. The battery must match your supply type.
Unbalanced load
In a three-phase home, when the three phases draw different amounts of power. A system that supports unbalanced loads can back up appliances even when the phases are uneven.
Backup / anti-islanding
Backup power runs your home during a grid outage. Anti-islanding is the safety function that stops the system feeding the grid during an outage, protecting line workers.
VPP (Virtual Power Plant)
A network of home batteries an energy provider can call on at peak times. Joining a VPP can earn you payments or credits for sharing stored energy back to the grid.
IP rating (e.g. IP65)
An Ingress Protection rating. The first digit is dust protection (6 = dust-tight), the second is water protection. An IP65/IP66 unit can be installed outdoors.
Rebates, payback and savings
Home battery storage can be eligible for government rebates and incentives, which change over time and vary by state and household. A correctly sized PowerOcean system — paired with the right rebate — can meaningfully shorten your payback period.
Sunbridge handles rebate guidance as part of the quote process: we check current eligibility, factor available incentives into your system design, and show you the expected payback based on your actual usage. See our battery rebate guidance for more, and we will confirm what applies to your address when you request a quote.
Read our battery rebate guidance →
Installation and support by Sunbridge
Sunbridge designs every PowerOcean system around your home rather than selling a fixed package. We start by analysing your electricity bills and smart-meter usage data to understand how and when you use power, then size the battery and inverter — and plan your expansion path — to match.
Installation is carried out by accredited installers to Australian standards, including switchboard and backup configuration, commissioning and testing, and a full handover so you know how to use the EcoFlow app. We also provide ongoing support and monitoring for the life of the system.
Warranty
The EcoFlow PowerOcean battery (EF BD-5.1-S1 and the matching stacks) is covered by EcoFlow’s PowerOcean Home Solar Battery Solutions Limited Warranty for Australia and New Zealand, issued by EcoFlow Australia Pty Ltd.
EcoFlow guarantees a minimum of 70% of the battery’s nominal capacity after 15 years or 6,000 cycles, whichever comes first, from the installation date. The warranty also sets out separate cover periods for the inverter and other components.
These are the manufacturer’s terms; your guarantees under the Australian Consumer Law apply in addition. Sunbridge confirms the warranty terms that apply to your configuration and registers the warranty on your behalf as part of the installation.
Frequently asked questions
How much capacity can the EcoFlow PowerOcean Three-phase hold?
You can start with a single 5.1 kWh battery and expand at any time, up to 45.9 kWh on a single inverter. Each pack adds 5.1 kWh nominal (4.8 kWh usable).
Is the PowerOcean single-phase or three-phase?
This model is a three-phase hybrid system available in 6, 8, 10 and 12 kW. EcoFlow also makes a single-phase PowerOcean — Sunbridge can recommend the right one for your supply.
What is the depth of discharge of the PowerOcean battery?
The standard PowerOcean three-phase battery is rated at 95% depth of discharge, so about 4.8 kWh is usable from each 5.1 kWh pack, as stated on the EcoFlow datasheet.
Can the PowerOcean back up my whole home during a blackout?
It delivers up to 12 kW of backup and supports three-phase and unbalanced loads, so it can run substantial parts of the home during an outage, subject to your switchboard and load profile.
What battery chemistry does it use, and is it safe?
It uses LFP (lithium iron phosphate / LiFePO₄), the most thermally stable mainstream lithium chemistry, in an IP65 outdoor-rated enclosure.
Can I add more batteries later?
Yes. PowerOcean is modular — each 5.1 kWh pack has its own DC-DC converter, so you can expand at any time and mix packs added at different times.
Is the PowerOcean eligible for a battery rebate?
It can be, depending on current government incentives and your state and household circumstances. Sunbridge checks eligibility and factors any available rebate into your quote and payback estimate.
How long is the warranty?
EcoFlow provides a 15-year warranty guaranteeing at least 70% of nominal capacity after 15 years or 6,000 cycles, whichever comes first. Australian Consumer Law guarantees also apply.
Can it be installed outdoors?
Yes. The battery and inverter are rated IP65 and operate from −20 °C to +50 °C, so they are suitable for outdoor installation in Australian conditions.
How do I monitor the system?
Through the EcoFlow app and web portal, with real-time visibility of solar generation, storage, consumption and backup status.
Interested in the EcoFlow PowerOcean Three-phase?
Talk to Sunbridge Energy about design, installation and a quote tailored to your home.