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The EcoFlow DELTA Pro Ultra Series Smart Extra Battery is a 6,144Wh LiFePO4 (LFP) battery for the DELTA Pro Ultra and DELTA Pro Ultra X inverters. Each one adds capacity to your system, and the DELTA Pro Ultra X inverter takes up to 10 of them.
It suits DELTA Pro Ultra X and DELTA Pro Ultra owners who want longer backup during outages, or anyone sizing a new system. This page sells it in quantities from 1 to 10 batteries.
Each battery stores 6,144Wh at 102.4V and 60A. EcoFlow rates one battery at 6kWh and ten batteries on one DELTA Pro Ultra X inverter at 60kWh, so you can match storage to your home and add more later.
EcoFlow says the battery works without setup. Stack it on the portable stand, connect it with a battery connection cable and monitor it in the EcoFlow app alongside the inverter.
The LFP cells are protected against overvoltage, overload, overtemperature, short circuit, low temperature, low voltage and overcurrent. EcoFlow describes the battery as using EV-grade LFP cells, a dual BMS and a 3-level safety architecture.
Five LEDs show the charge level in 20% steps while discharging, and a blinking LED shows progress while charging. All five blink when the battery reaches 0%, so you can check it at a glance without the app.
EcoFlow says the DELTA Pro Ultra X inverter delivers its full 12kW with two or more second-generation batteries connected by second-generation cables. Plan on at least two batteries per inverter if you want its full output.
Longer outage backup. Add batteries to keep your home's circuits running longer when the grid is down.
Growing a system over time. Start with two batteries and add more as your needs or budget change, up to 10 per DELTA Pro Ultra X inverter.
Multi-inverter homes. EcoFlow says three DELTA Pro Ultra X units on a Smart Home Panel 3, each with ten batteries, reach 180kWh.
Versus the complete DELTA Pro Ultra X system. EcoFlow's standard system pairs one inverter with two batteries for 12.288kWh. The extra battery adds storage to a system you already own, 6,144Wh at a time.
Versus a lead-acid battery bank. A lead-acid bank needs its own charger, inverter and wiring. This battery stacks on the DELTA Pro Ultra system and reports to the same app.
This may be a good fit if
Up to 10 on one DELTA Pro Ultra X inverter, with 5 per stack.
EcoFlow lists it as compatible with both the DELTA Pro Ultra and DELTA Pro Ultra X inverters. On the X inverter, first-generation batteries (serial numbers starting with Y712) need a one-time firmware update in the EcoFlow app, and output may be lower with them.
For long-term storage, fully charge it, then discharge it to 60%, and repeat every 3 months. Leaving it unused or uncharged for more than six months voids the warranty.
EcoFlow lists a 5-year full warranty.
The EcoFlow DELTA Pro Ultra Series Smart Extra Battery adds 6,144Wh of LFP storage to a DELTA Pro Ultra or DELTA Pro Ultra X system, up to 10 batteries per X inverter. If you have questions about how many batteries your home needs, the Outbound Power team is happy to help.
EcoFlow DELTA Pro Ultra Series Smart Extra Battery Specifications |
|
|---|---|
| General | |
| Model | EFYJ751-BP |
| Compatible Inverters | DELTA Pro Ultra, DELTA Pro Ultra X |
| Quantities on This Page | 1 to 10 batteries |
| Capacity and Battery | |
| Capacity | 6,144Wh (102.4V, 60A) |
| Cell Chemistry | LFP (LiFePO4) |
| Voltage Protection | Overvoltage, low voltage |
| Current Protection | Overload, overcurrent, short circuit |
| Temperature Protection | Overtemperature, low temperature |
| Battery Gauge | 5 LED indicators |
| Expansion | |
| Batteries per Ultra X Inverter | Up to 10 (5 per stack) |
| Capacity With 10 Batteries | 60kWh |
| Max With 3 Ultra X Units | 180kWh |
| Max With 3 Units Condition | With Smart Home Panel 3 |
| Size and Weight | |
| Dimensions | 26 x 18 x 8 in (660 x 455 x 204 mm) |
| Net Weight | 111.3 lb (50.5 kg) |
| Environment | |
| Operating Temperature | -4°F to 113°F (-20°C to 45°C) |
| Storage Temperature | -4°F to 113°F (-20°C to 45°C) |
| Operating Humidity | Under 90% |
| Altitude | Under 3000 m |
| Warranty | |
| Warranty | 5-year full warranty |
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