Tesla Powerwall 3 vs EcoFlow OCEAN Pro: what each maker publishes

The Tesla Powerwall 3 and the EcoFlow OCEAN Pro are both installed, grid-tied home batteries with a solar inverter built into the system. They are still built differently. A Powerwall 3 is one box that holds the battery and the inverter. An OCEAN Pro is a wall-mounted hybrid inverter with separate 10 kWh battery packs behind it.

Every figure below comes from a document the maker publishes. Powerwall 3 figures are the ones on our Powerwall 3 page, from the Tesla Powerwall 3 datasheet (read October 19, 2026). OCEAN Pro figures come from EcoFlow's OCEAN Pro Hybrid Inverter datasheet, its OCEAN Pro Battery datasheet, its OCEAN Pro installation guide, V1.4, its OCEAN Pro product page and its FAQ, all read October 19, 2026. The OCEAN Pro is not one of the models in our battery database, so there is no HBR model page for it. We have not tested either system.

Side by side

Capacity and expansion

Tesla's datasheet lists the Powerwall 3 at 13.5 kWh of Nominal Battery Energy, labeled AC and footnoted as a value at 77 degrees F at beginning of life with 3.3 kW charge and discharge power. Our Powerwall 3 model page lists that figure as its capacity. EcoFlow's battery datasheet lists each OCEAN Pro Battery at 10 kWh of Nominal Battery Energy at a rated 400V DC, and does not say whether the 10 kWh is measured on the AC or DC side. Neither datasheet lists a depth of discharge.

Expansion works differently on each. Tesla separates it into two rows: Power Scalability, "Up to 4 Powerwall 3 units supported," and Energy Scalability, "Up to 3 Expansion units (for a maximum total of 7 units)." Its largest example configuration is captioned "(4) Powerwall 3 Units with (3) Expansion Units (Maximum System Size)," and its floor-mount stacking row reads "Up to (3) Expansion units behind a Powerwall 3." Tesla's Powerwall page (read October 19, 2026) puts it as "40.5 kWh max addition per unit." So one Powerwall 3 reaches 54 kWh with three Expansions, and the largest Tesla system is seven units, 94.5 kWh, both by our arithmetic. An Expansion adds energy with no inverter, which our Powerwall 3 Expansion guide covers in detail. EcoFlow's inverter datasheet lists Energy Scalability as "Up to 8 OCEAN Pro Batteries (80 kWh) with one Inverter" and Power Scalability as "Up to 2 units supported (48kW)." The product page phrases the range as "Start with 10kWh and expand to 80kWh." EcoFlow does not publish, in the documents we read, a combined energy ceiling for a two-inverter system. On published energy, EcoFlow's figure is larger per inverter and Tesla's per system.

Tesla's Expansion is only compatible with Powerwall 3. EcoFlow's FAQ answers the third-party battery question with "Only compatible with EcoFlow OCEAN Pro Battery."

A large stack on either system also raises a fire code limit on aggregate stored energy, set by your building department; see our UL 9540 and NFPA 855 guide.

Continuous and start power

Both datasheets present output as rating columns, each column with its own overcurrent protection device. The Powerwall 3 datasheet lists four Nominal Output Power (AC) columns, 5.8, 7.6, 10 and 11.5 kW, at 30, 40, 60 and 60 A, with 11.5 kW as the top rating and the figure on our model page. It also lists a Configurable Maximum Continuous Discharge Power Off-Grid of 15.4 kW, footnoted as PV only, between minus 4 and 77 degrees F, available only if the on-grid rating is 11.5 kW and only with an 80 A breaker. Tesla publishes no peak watt figure.

The OCEAN Pro inverter datasheet lists two columns, 11.5kW and 24.0kW, at maximum continuous currents of 48A and 100A and overcurrent protection devices of 60A and 125A. EcoFlow's FAQ lists "Inverter rated power" among the key parameters set during initial commissioning, so the rating is configured at install. The product page states "24kW continuous output," footnoted that actual backup capability "depends on battery state of charge, total load size, and individual appliance startup requirements."

The battery side sets its own limit. EcoFlow's battery datasheet rates each 10 kWh pack at 10kW maximum continuous discharge power. By our arithmetic, 24 kW from the batteries alone, with the grid and the sun both gone, needs at least three 10 kW packs. EcoFlow does not publish the pack count itself, so put that question to the installer in writing, for the exact number of packs on your quote.

Start power is easier to compare, because both makers publish it in the unit an air conditioner or well pump nameplate uses. Tesla lists a Load Start Capability of 185 LRA. EcoFlow lists 205A LRA (1s), and its FAQ states the inverter "can support to directly start a 5-ton air conditioner." EcoFlow states a one-second duration; Tesla's datasheet row states no duration. Our surge ratings guide explains how to set an LRA figure against your own equipment.

Whole-home or partial backup

Both are designed to carry a whole home through an outage, and both can also be set up for a subset of circuits. Tesla's datasheet opens by saying customers "can receive whole home backup," and lists its supported islanding devices as Gateway 3, Backup Switch and Backup Gateway 2. EcoFlow lists its islanding devices as the OCEAN Smart Electrical Panel, the OCEAN Meter Backup Switch and the OCEAN Gateway. Its installation guide draws four whole home backup layouts and one partial home backup layout, which it describes as backing up "a portion of the home, typically the most critical circuits." The difference between the two setups is covered in our whole-home vs essential backup entry.

On switchover time, EcoFlow's FAQ states the system switches "automatically within 10 ms." Tesla's product page describes "Seamless backup transition" and does not give a time in milliseconds.

Solar and inverter integration

Tesla lists a Maximum Solar STC Input of 20 kW across 6 MPPTs. EcoFlow lists 40kW across 8 MPPTs, at 5kW per channel. Both list the same 60 to 550V DC PV input range and both list 97.5 percent Solar to Home/Grid Efficiency. EcoFlow's datasheet also lists the inverter as "AC coupled and DC coupled," and its installation guide includes layouts that add the OCEAN Pro to an existing PV system.

One condition on EcoFlow's solar figure matters if you also want a generator. The installation guide states that when all of the PV5 to PV8 ports are used for solar panels, "the generator interface will be disabled." A home that uses all eight solar inputs gives up the generator connection.

Maximum continuous charge power also differs. Tesla lists maximum continuous charge power of 5 kW for a Powerwall 3 alone and 8 kW with up to three Expansion units. EcoFlow lists 24kW for the inverter at 5kW per battery, so the charge rate it publishes depends on how many packs are installed.

Generator and vehicle support

EcoFlow publishes a generator input on the inverter itself. The Extend Backup Socket accepts a portable generator at 120V or 240V, a portable power station or an EV with V2L, at up to 10kW maximum continuous and 300W minimum. The installation guide gives the generator input specification as 2.5 to 10kW. EcoFlow's "unlimited" backup claim on the product page is footnoted: the system "charges the battery first, then powers the home," and duration depends on generator output and fuel supply.

The Powerwall 3 datasheet has no generator input row. Tesla's product page describes extending backup with the battery in a compatible Model 3, Model Y or Cybertruck through Powershare. If a portable generator is part of your plan with a Powerwall, ask the installer how it would be wired before you sign.

Efficiency

Both makers publish a row called Solar to Battery to Home/Grid Efficiency: 89 percent for the Powerwall 3 and 87 percent for the OCEAN Pro. That is a solar round trip, not the AC-to-AC round trip many other makers publish, and neither maker publishes an AC-to-AC figure. Tesla footnotes its 89 percent as a "Typical solar shifting use case," with values given at 77 degrees F, at beginning of life, at "3.3 kW charge/discharge power." EcoFlow's 87 percent carries no footnote stating its test conditions. The labels match, but only one figure comes with its conditions, so the gap is not a measured ranking. Our efficiency comparison explains why the basis matters.

Warranty

The Tesla Powerwall Limited Warranty (USA), Rev 2.6, effective May 6, 2026 (read October 19, 2026), covers the Powerwall 3 for ten years from installation, with 70 percent of 13.5 kWh at ten years. Cycles are unlimited for solar self-consumption, time-based control and backup; any other application is capped at 37.8 MWh of aggregate throughput measured at the battery AC output. Tesla also states that if the Powerwall is not connected to the internet for an extended period it may not honor the full ten years, but will honor at least four.

EcoFlow's OCEAN Pro warranty policy (read October 19, 2026) lists 15 years for the hybrid inverter, the battery, the Smart Electrical Panel and the Meter Backup Switch. For the battery it guarantees "a minimum nominal capacity of 70% after 15 years of use or 6000 charge/discharge cycles," in an environment of minus 20 to 50 degrees C. EcoFlow caps wear with a cycle count rather than a throughput figure, and the policy does not add a "whichever comes first" phrase. The policy applies to buyers "who purchase this Product through an installer," and it excludes damage where the product was installed "without EcoFlow's authorization."

Tesla's terms carry matching channel conditions: coverage applies to a Powerwall "purchased from Tesla or a Tesla certified installer in the United States of America" and excludes "modification or repair of your Tesla Product performed by anyone other than Tesla or a Tesla certified installer." The start dates differ too: EcoFlow's warranty "starts from the delivery of the Products," while Tesla's runs from the "initial installation date."

So EcoFlow's term is five years longer, and both guarantee the same 70 percent floor. Our warranty comparison sets the Powerwall 3 against the other models we track.

How each is sold and installed

Tesla's Powerwall page (read October 19, 2026) offers "Order Powerwall 3" directly from Tesla, and Tesla's warranty covers units bought from Tesla or a Tesla certified installer. EcoFlow's product page offers "Get a Quote" and states in its comparison table that the OCEAN Pro "Requires certified installer with local utility & authority having jurisdiction approval." Its installation guide states that only EcoFlow-certified installers can use the commissioning app.

Neither maker publishes how many installers it has in a given area, and none of the pages we read lists a price for either system. Tesla pricing is covered in our Powerwall 3 cost guide. For a cash buyer in 2026, neither earns a federal credit. The IRS states that the Residential Clean Energy Credit (Section 25D) "is not available for any property placed in service after December 31, 2025" (read October 19, 2026), and the 30 percent survives only through a lease or PPA where the owner claims Section 48E.

What neither publishes

• A depth of discharge for the battery.
• An AC-to-AC round-trip efficiency.
• A peak watt rating. Both give motor start in LRA instead.
• Installer counts or service coverage by region.
• A price on the pages we read.

Tesla additionally publishes no cell chemistry for the Powerwall 3. EcoFlow additionally publishes no battery count behind its 24 kW output figure, and no energy ceiling for a two-inverter system.

Which fits which home, on the published specs

The OCEAN Pro's published numbers suit a home with a large solar array or room for one, since 40 kW of solar input is twice Tesla's 20 kW. They also suit a home that wants a published generator input on the inverter itself, up to 10kW, and can live with EcoFlow's wiring conditions for it: the installation guide disables the generator interface when PV ports 5 to 8 are all used for solar. That is a difference in what is published: the Powerwall 3 datasheet has no generator row, which is not the same as Tesla offering no generator support, so a Tesla installer is the person to ask. A household with several large motor loads may also look here: EcoFlow publishes 205A LRA (1s) and a 24 kW output column, though the second needs the pack count confirmed. The 15 year term suits an owner planning to stay a long time.

The Powerwall 3's published numbers suit a home that wants the most energy in a single box, 13.5 kWh, with the inverter inside it, or the largest system either maker states, seven units and 94.5 kWh by our arithmetic. They suit a solar array within 20 kW, and an owner who wants published test conditions behind the efficiency figure. A household with Tesla vehicles also gets Powershare, which Tesla documents as a way to extend backup.

Either fits a home that wants whole-home backup with the option of a partial panel, an outdoor-rated NEMA 3R install, and a 70 percent capacity floor in the warranty. Read the quote for the exact configuration, since both makers' maximums describe more hardware than a base install.