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The EcoFlow DELTA Pro Ultra X Inverter is the power unit of EcoFlow's DELTA Pro Ultra X home backup system. It turns stored battery energy into 12kW of 120/240V AC power, manages two high-voltage solar inputs and connects to a Smart Home Panel 3 or Smart Gateway. It stores no energy on its own, so it works together with DELTA Pro Ultra series batteries, which are sold separately.
It suits owners who are building a system around their own battery count, adding another inverter for more output, or moving original DELTA Pro Ultra batteries to the newer X inverter.
The inverter shares 12000W at 120/240V and 60Hz across two NEMA 5-20 outlets (120V 20A), one NEMA L14-30 (120/240V 30A) and one NEMA 14-50 (120/240V 50A). A 50A power input/output port carries the same 12000W to a Smart Home Panel 3 or Smart Gateway. Full 12kW output needs two or more second-generation batteries on second-generation cables.
When it is connected to the grid, the inverter works as a UPS and switches your loads to battery power within 10ms during an outage. Paired with a Smart Home Panel 3 or Smart Gateway, the switchover happens within 20ms.
Each PV input takes 80–500V at up to 15A and 5kW, for 10kW in total. EcoFlow's wall-mounted PV switch box handles both circuits with MC4 connections and lets you turn off solar before you disconnect a cable. You can also charge from solar and a wall outlet at the same time.
The power input/output port charges at 1800W with a 5-15P cable, 7200W with an L14-30 cable, and 12000W with a 14-50, 5P8 or J1772 cable. A generator connects through the EcoFlow AC Generator Charging Adapter, and an EV charger through the EcoFlow EV X-Stream Adapter. To charge from solar and a generator together, EcoFlow requires its FlowMaster Generator Rectifier.
Each DELTA Pro Ultra series battery stores 6,144Wh, and one inverter takes up to 10 of them, with 5 per stack. EcoFlow rates ten batteries on one inverter at 60kWh of total capacity.
Connect up to three inverters to a Smart Home Panel 3 and they work together as one system, for up to 36kW of output and 180kWh of capacity. Reaching 36kW takes at least two batteries on each unit, and reaching 180kWh takes ten batteries on each unit.
When the inverter charges and discharges at the same time, it enters bypass mode automatically, and built-in X-Fusion helps every AC outlet deliver its optimal output, as long as the battery has enough charge. Wi-Fi and Bluetooth let you set charge and discharge limits, change operating modes and update firmware from the EcoFlow app.
Building a system to size. Pair the inverter with anywhere from 2 to 10 DELTA Pro Ultra series batteries to match your backup needs.
Upgrading from a DELTA Pro Ultra. First-generation DELTA Pro Ultra batteries connect after a one-time firmware update in the EcoFlow app.
More output for a large home. Add a second or third inverter to a Smart Home Panel 3 for up to 36kW.
Standalone 240V power. Without a panel, run loads from the L14-30 and 14-50 outlets. Set the AC timeout to Never in the app so the outlets stay on.
Versus the complete DELTA Pro Ultra X system. EcoFlow's standard system pairs this inverter with two 6,144Wh batteries for 12.288kWh. The inverter alone makes sense when you already have batteries or want to choose your own count.
Versus a portable gas generator. A generator needs fuel and a well-ventilated spot outdoors. This inverter runs from stored battery and solar energy, and it can still charge from a generator through the adapter.
This may be a good fit if
No. This listing is the inverter only. Add DELTA Pro Ultra series batteries, or choose the complete DELTA Pro Ultra X system, which comes with batteries.
Yes, after a firmware update. The first time you connect first-generation batteries (serial numbers starting with Y712), turn off the inverter and batteries, connect them, wake them with a power button, then run the update in the EcoFlow app. Output may be lower than 12kW with first-generation batteries.
The power input/output port accepts 100–120V at 50/60Hz with a 5-15P cable, or 120/240V at 50/60Hz with the L14-30, 14-50, 5P8 or J1772 cables. AC output is 120/240V at 60Hz.
EcoFlow lists a 5-year warranty. Leaving the product unused or uncharged for more than six months voids the warranty, so in storage, fully charge it and discharge it to 60% every 3 months.
The EcoFlow DELTA Pro Ultra X Inverter brings 12kW of 120/240V output, a 10ms UPS transfer and 10kW of solar input to your DELTA Pro Ultra series battery stack. If you have questions about battery count, adding inverters or panel options, the Outbound Power team is happy to help.
EcoFlow DELTA Pro Ultra X Inverter Specifications |
|
|---|---|
| General | |
| Model | EF-DU-001 |
| Display | LCD |
| Batteries | Not included |
| Compatible Batteries | DELTA Pro Ultra series |
| Expansion | |
| Batteries per Inverter | Up to 10 (5 per stack), 6,144Wh each |
| Capacity With 10 Batteries | 60kWh |
| Parallel Units | Up to 3 on a Smart Home Panel 3 (36kW, 180kWh) |
| AC Output | |
| Rated AC Output | 120/240V, 60Hz, 12000W total |
| NEMA 5-20 Outlets | 2 x 120V 20A |
| NEMA L14-30 Outlet | 1 x 120/240V 30A |
| NEMA 14-50 Outlet | 1 x 120/240V 50A |
| Power Input/Output Port | 120/240V, 60Hz, 12000W, 50A |
| UPS Transfer (Standalone) | Within 10ms |
| UPS Transfer (With Panel 3) | Within 20ms |
| UPS Transfer (With Gateway) | Within 20ms |
| Charging Input | |
| Solar Input | 2 ports, 80-500V, 15A max |
| Solar Max Per Port | 5kW |
| Solar Max Total | 10kW |
| AC Charge (5-15P to 5P8) | 100-120V, 50/60Hz, 1800W, 15A |
| AC Charge (L14-30 to 5P8) | 120/240V, 50/60Hz, 7200W, 30A |
| AC Charge (14-50 to 5P8) | 120/240V, 50/60Hz, 12000W, 50A |
| AC Charging (5P8 to 5P8 Cable) | 120/240V, 50/60Hz, 12000W, 50A |
| EV Charge (J1772 to 5P8) | 120/240V, 50/60Hz, 12000W, 50A (charge only) |
| Size and Weight | |
| Dimensions | 27 x 19 x 9 in (675 x 475 x 230 mm) |
| Net Weight | 76.06 lb (34.5 kg) |
| Environment | |
| Operating Temperature | -4°F to 122°F (-20°C to 50°C) |
| High-Temperature Derating | AC output 90% above 113°F (45°C) |
| Operating Humidity | Under 90% |
| Operating Altitude | Under 3000 m (output 80% above 2000 m) |
| Ingress Protection | IP54 |
| Noise | Under 30 dB at 0.5 m (25°C ambient, 4kW output) |
| Connectivity | |
| Wireless | Wi-Fi and Bluetooth |
| App | EcoFlow app |
| Warranty | |
| Warranty | 5 years |
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