Overview
DELTA Pro Ultra X is EcoFlow’s split-phase home backup platform. This listing is the inverter only. Each inverter delivers 12kW at 120/240V, and up to three inverters can run in parallel for 36kW. EcoFlow lists the main upgrades over the original DELTA Pro Ultra as 12,000W output (from 7,200W), 10 battery packs per inverter (from 5) and 10,000W of PV input (from 5,600W).
Key points
- Output: 12kW, 120/240V, 60Hz; NEMA 5-20 (x2), L14-30 (x1) and 14-50 (x1) on the front.
- Solar: two high-voltage PV inputs, 80-500V / 15A each (5,000W per input, 10kW total). EcoFlow states the PV inputs connect through the EcoFlow PV Switch Box.
- Batteries: up to 10 x 6144Wh packs per inverter. For full 12kW output EcoFlow recommends connecting batteries to both battery ports in equal numbers. EcoFlow also documents an upgrade procedure for connecting earlier DELTA Pro Ultra series batteries.
- Backup switchover: under 10 ms stand-alone; under 20 ms with Smart Home Panel 3 or Smart Gateway.
- Not grid-tied: the system draws power from the grid but does not export to it.
- IP54 rating and a 5-year warranty.
Technical specifications
| Model | DELTA Pro Ultra X Inverter (EFDELTAPROUX-US) |
|---|---|
| AC output | 12kW, 120/240V, 60Hz (up to 36kW with 3 inverters in parallel) |
| AC outlets | NEMA 5-20 x2 (120V 20A); NEMA L14-30 x1 (120/240V 30A); NEMA 14-50 x1 (120/240V 50A) |
| Rated AC input | 12kW, 100/200-120/240V, 50A |
| PV input | 2 ports, 80-500V / 15A, 5,000W max each, 10kW total |
| Battery capacity per inverter | Up to 61.44 kWh (10 x 6144Wh packs) |
| Battery chemistry | LFP |
| UPS switchover | <10 ms stand-alone; <20 ms with Smart Home Panel 3 |
| Noise | <30 dB at 0.5 m (25°C, 4 kW output) |
| IP rating | IP54 |
| Operating and storage temperature | -4 to 122°F (-20 to 50°C) |
| Net weight | 70.1 lb (34.5 ± 0.2 kg) |
| Dimensions | 26.6 x 18.7 x 9.06 in (675 x 475 x 230 mm) |
| Warranty | 5 years |
| Batteries | Not included |
Specifications as published by EcoFlow on its official product page. Warranty terms are as stated by EcoFlow.
Buying from CSE Solar USA
Questions about sizing, expansion or delivery timing? Contact CSE Solar USA and our team will help you choose the right setup. See all EcoFlow products at CSE.


