EcoFlow’s DELTA 3 Ultra Plus brings a 3,072Wh LiFePO4 battery and a 3,600W inverter to the same class the original DELTA Pro defined, while cutting weight to about 74 pounds, according to EcoFlow’s spec pages. The DELTA Pro, still sold today, holds more energy at 3,600Wh and can scale to 25kWh, but weighs about 99 pounds. Both share 1,600W of solar input and the same 7,200W surge figure. The differences are in weight, ports, UPS speed and how far each one expands. Here’s a spec-by-spec breakdown and who each one suits.
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Figures come from EcoFlow’s DELTA 3 Ultra Plus spec page and the DELTA Pro user manual and product page. You can find the EcoFlow DELTA 3 Ultra Plus and the EcoFlow DELTA Pro on Amazon. I haven’t tested either unit, so runtimes are labeled estimates. I’ve spent a lot of time with EcoFlow’s smaller DELTA 3 Max, which you can read about in my Delta 3 Max boondocking guide.
Specs side by side
| Spec | DELTA 3 Ultra Plus | DELTA Pro |
|---|---|---|
| Capacity | 3,072Wh LFP (51.2V, 60Ah) | 3,600Wh LFP |
| Expandability | Up to about 11kWh with two compatible extra batteries and adapter | Up to 25kWh with extra batteries and Smart Generators |
| AC output | 3,600W total (120V), 7,200W surge | 3,600W, 7,200W surge |
| X-Boost | 4,600W | 4,500W |
| AC outlets | 4 × 20A + 1 × 30A | Multiple 120V/20A outlets plus a 30A outlet |
| USB-C | 1 × 140W + 2 × 45W (shared) | 2 × 100W |
| USB-A | 1 × 18W | Multiple USB-A including fast charge |
| 12V DC | Anderson 12.6V/30A (378W) + car outlet 126W (shared) | Anderson + car outlet |
| AC charging | 1,800W | 1,800W at 120V; 3,000W at 240V |
| Solar input | 1,600W max | 1,600W, 11–150V, 15A |
| UPS / EPS switchover | <10 ms | 30 ms |
| Cycle life | LFP (see EcoFlow listing) | 3,500 to 80%; 6,500 to 50% |
| Weight | 33.7 kg (about 74 lb) | About 45 kg (99 lb) |
| Size (H×W×D) | 613 × 328 × 395 mm (24.1 × 12.9 × 15.6 in) | See EcoFlow listing |
| Connectivity | Wi-Fi + Bluetooth | Wi-Fi + Bluetooth (app) |
| Warranty | 5 years (3 standard + 2 with app registration) | 5 years |
Capacity: DELTA Pro holds 528Wh more
At 3,600Wh, the DELTA Pro stores about 17% more energy than the DELTA 3 Ultra Plus’s 3,072Wh. That’s roughly two extra hours on a 250W load.
| Load | DELTA 3 Ultra Plus (est.) | DELTA Pro (est.) |
|---|---|---|
| Full-size fridge, ~60W average | ~44 hr | ~51 hr |
| Fridge + router + lights, ~150W | ~17 hr | ~20 hr |
| Well pump cycling, ~400W average | ~6.5 hr | ~7.7 hr |
| RV air conditioner, ~1,300W | ~2 hr | ~2.4 hr |
| Space heater, 1,500W | ~1.7 hr | ~2 hr |
*Estimates: Wh × 0.85 ÷ load watts. Fridge and AC duty cycles vary widely.
Expansion: DELTA Pro scales much further
The DELTA Pro has the bigger ecosystem, scaling from 3.6kWh to 25kWh with extra batteries and Smart Generators, and EcoFlow’s home integration accessories. The DELTA 3 Ultra Plus expands to about 11kWh with two compatible extra batteries and an expansion adapter. For most homes, 11kWh covers a long outage on essentials. If you’re aiming at whole-home backup, EcoFlow’s purpose-built system, covered in my DELTA Pro Ultra review, is the bigger step up.
Output and ports
Both deliver 3,600W continuous with a 7,200W surge, enough for a microwave, a well pump or a 15,000 BTU RV air conditioner (with startup headroom). X-Boost lets heating appliances run up to 4,600W on the DELTA 3 Ultra Plus and 4,500W on the DELTA Pro at reduced power.
The DELTA 3 Ultra Plus brings modern USB: a 140W USB-C port for big laptops and two 45W ports (sharing 45W total). It also has a 12V/30A Anderson port rated for 378W, great for 12V fridges and van gear. The DELTA Pro has two 100W USB-C ports and a 30A RV outlet that RVers have used for years.
Charging
From a standard 120V wall outlet, both charge at up to 1,800W. The DELTA Pro can reach 3,000W on a 240V circuit. Both accept 1,600W of solar; the DELTA Pro lists an 11–150V window at up to 15A.
| Source | DELTA 3 Ultra Plus 0–100% (est.) | DELTA Pro 0–100% (est.) |
|---|---|---|
| 1,800W AC (120V) | ~1.9 hr | ~2.2 hr |
| 3,000W AC (240V) | — | ~1.3 hr |
| 1,600W solar (~1,200W real) | ~2.6 hr | ~3 hr |
| 800W solar (~600W real) | ~5.1 hr | ~6 hr |
*Estimates: Wh ÷ input watts; charging slows near full.
UPS: a clear win for the DELTA 3 Ultra Plus
EcoFlow lists a switchover under 10 ms for the DELTA 3 Ultra Plus, versus 30 ms for the DELTA Pro’s EPS mode. Ten milliseconds is fast enough for most desktop PCs and network equipment, so the newer unit is the better pick as an always-plugged-in home UPS.
Weight and portability
At about 74 lb, the DELTA 3 Ultra Plus is still a two-hand lift, but it’s 25 lb lighter than the DELTA Pro’s 99 lb. That makes a real difference when moving it between garage, house and RV.
Who should buy which
| If you… | Better fit |
|---|---|
| Want a fast UPS for a home office | DELTA 3 Ultra Plus |
| Move the unit often | DELTA 3 Ultra Plus |
| Run 12V van gear from an Anderson port | DELTA 3 Ultra Plus |
| Want maximum single-unit capacity | DELTA Pro |
| Plan to scale toward 25kWh | DELTA Pro |
| Have a 240V outlet for faster charging | DELTA Pro |
Worked example: a home outage on essentials (estimate)
Here’s a typical essentials list for a winter outage: a full-size fridge (about 60W average), router and modem (15W), LED lights and phone charging (about 50W average), and a gas furnace blower (about 400W while running, roughly 30% of the time, or about 120W average). That averages about 245W.
| Setup | Usable energy (×0.85) | Runtime at ~245W (est.) |
|---|---|---|
| DELTA 3 Ultra Plus | ~2,611Wh | ~10.7 hr |
| DELTA Pro | ~3,060Wh | ~12.5 hr |
| DELTA 3 Ultra Plus expanded to ~11kWh | ~9,350Wh | ~38 hr |
Either base unit gets you through a long evening and night. For multi-day outages, the deciding factor is how you’ll recharge: 1,600W of solar on a clear day can put back most of a full charge on either unit, and a gas generator into the 1,800W AC input refills either one in about two hours.
Worked example: an RV night with air conditioning (estimate)
A rooftop RV AC drawing about 1,300W and cycling about half the time averages roughly 650W. Over an 8-hour night, that’s about 5,200Wh, which is more than either base unit holds. Realistic options are to run the AC in the evening, pre-cool the RV while plugged in or on solar, or use the generator overnight and keep the battery for quiet hours. For fans, a fridge, lights and devices without AC, either unit easily covers a weekend with daily solar.
Before you buy: quick checks
- RV plug type. Both have a 30A outlet that suits many RVs. If your rig uses a 50A plug, plan for an adapter and keep loads within the unit’s output.
- Charging circuits. If you have a 240V outlet in the garage and want the fastest wall charging, the DELTA Pro can use it.
- Where it will live. At 74 lb and 99 lb, both are heavy. Measure the space, and plan to roll it rather than carry it far.
- Solar plan. Check your panels’ combined voltage and current against each unit’s solar input before buying panels.
FAQ
Is the DELTA 3 Ultra Plus the replacement for the DELTA Pro?
It sits in the same 3kWh, 3,600W class with a newer, lighter design. EcoFlow continues to sell the DELTA Pro alongside it.
Can either run an RV air conditioner?
Yes. A 3,600W inverter with 7,200W surge handles a typical RV rooftop AC; runtime is roughly two hours on battery alone (estimate).
Which one charges faster from solar?
Both top out at 1,600W, so the smaller-capacity DELTA 3 Ultra Plus fills slightly sooner.
Do they work with the EcoFlow app?
Yes, over Wi-Fi and Bluetooth.
Which is better for home backup?
For essentials and a fast UPS, the DELTA 3 Ultra Plus. For more stored energy and bigger expansion, the DELTA Pro.
Can either one power a home office all day?
Yes. A desktop PC, monitor and networking gear at about 250W run for roughly 10–12 hours on either base unit (estimate), and the DELTA 3 Ultra Plus’s sub-10 ms switchover suits PCs that need a fast UPS.
Which is easier to move around?
The DELTA 3 Ultra Plus, at about 74 lb versus 99 lb. Both are best rolled on their handles or moved by two people, but the 25 lb difference is noticeable on steps and getting in and out of a truck bed.
Bottom line
The DELTA 3 Ultra Plus modernizes EcoFlow’s 3kWh class with a faster UPS, 140W USB-C, a 30A Anderson port and a 25-pound weight saving. The DELTA Pro still wins on raw capacity, 240V charging and expansion to 25kWh. Pick the Ultra Plus for everyday home and RV versatility, and the DELTA Pro if you want the biggest scalable battery.