EcoFlow’s DELTA 3 Ultra Plus is a 3,072Wh, 3,600W power station with two separate 800W solar inputs, a 30A RV outlet and room to grow to about 11kWh, according to EcoFlow’s spec page and user manual. It weighs about 74 pounds, switches to battery in under 10ms and is rated at 25dB at a 600W load. The “Plus” matters: compared with the base DELTA 3 Ultra, it doubles solar input to 1,600W, adds a 12V Anderson port and supports expansion batteries. This review breaks down the specs, what each one means in use, and who the DELTA 3 Ultra Plus suits best.
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I haven’t tested the DELTA 3 Ultra Plus myself. Specs come from EcoFlow’s DELTA 3 Ultra Plus spec page, its product page and the online user manual. Runtimes and charge times I calculated are labelled as estimates. You can see current pricing for the EcoFlow DELTA 3 Ultra Plus on Amazon.
DELTA 3 Ultra Plus specs
| Spec | EcoFlow figure |
|---|---|
| Capacity | 3,072Wh LiFePO4 (51.2V, 60Ah) |
| Expansion | Up to about 11kWh with two DELTA Pro 3 Extra Batteries |
| AC output | 120V, 3,600W total, 7,200W surge; four 20A outlets and one 30A outlet |
| X-Boost | 4,600W (for resistive appliances) |
| USB-C | 1 x 140W; 2 x 45W (45W total, shared) |
| USB-A | 1 x 18W |
| 12V DC | Anderson 12.6V/30A and car outlet 12.6V/10A, 378W total (shared) |
| AC charging | 1,800W; 0–80% in 89 minutes |
| Solar input | 2 x XT60, 11–60V, 18A, 800W per port; 1,600W total |
| DC/car input | 12V 8A, 24V 8A or 48V 16.6A |
| Generator charging | Up to 3,200W with EcoFlow Smart Generator 4000; 0–80% in 53 min, 100% in 76 min |
| Solar + generator | 0–80% in 48 minutes |
| UPS | Under 10ms |
| Noise | 25dB or less at 600W, measured at 1m |
| Weight | 33.7kg (about 74.3 lb) |
| Size (HxWxD) | 613 x 328 x 395mm (24.1 x 12.9 x 15.6 in) |
| Temperatures | Charge 32–113°F; discharge 14–113°F |
| Warranty | 5 years (3 standard + 2 with app registration) |
| Connectivity | Wi-Fi and Bluetooth, EcoFlow app |
Plus vs base DELTA 3 Ultra: what the extra money buys
EcoFlow sells two versions with the same battery and inverter. Its comparison table lists these differences:
| Feature | DELTA 3 Ultra Plus | DELTA 3 Ultra |
|---|---|---|
| Solar input | 1,600W (two 800W ports) | 800W |
| Expansion | Up to about 11kWh | None |
| 12V DC output (Anderson + car) | Yes | No (car outlet listed separately) |
| Generator charging | Up to 3,200W with Smart Generator 4000 | 1,600W |
| Charging methods | 6 | 4 |
| Smart Output Priority | Yes | No |
| Weight | 33.7kg | 32.7kg |
If you’ll ever add solar beyond 800W or want a multi-day battery bank, the Plus is the one to get. The base model makes sense for wall-charged home backup only.
What stands out
Two independent solar inputs
The Plus has two XT60 solar ports, each rated 11–60V, 18A and 800W. Because they’re independent, you can run different arrays on each, for example a roof panel on one and a portable ground panel on the other, without matching them. The catch is the 60V ceiling. A typical 400W residential panel has an open-circuit voltage around 37V, so you can’t put two in series on one port. You’d wire 100W–200W portable panels in series, or larger panels in parallel, to stay under 60V in cold weather. Our series vs parallel guide walks through the math.
RV-ready 30A outlet and 12V Anderson port
EcoFlow’s product page says the 30A outlet is a TT-30, the standard RV shore-power plug, so you can plug a camper’s cord straight in. The 12V Anderson port supplies up to 30A (378W, shared with the car socket), which suits a 12V fridge or a diesel heater directly without going through the inverter. See our guide to powering a diesel heater from a power station.
Fast charging from almost anything
EcoFlow lists six ways to charge the Plus: wall, solar, car, alternator charger, generator and its Smart Generator. From a standard 120V outlet, the 1,800W input reaches 80% in 89 minutes. Paired with an EcoFlow Smart Generator 4000, input climbs to 3,200W. The DC input also accepts 12V, 24V or 48V vehicle power, and EcoFlow’s 800W Alternator Charger connects to a solar port. Our EcoFlow 800W Alternator Charger setup guide explains that install.
Quiet enough for a bedroom
EcoFlow rates the unit at 25dB or less at 600W, measured one meter away, using what it calls X-Quiet 3.0 stepless fan control. That’s quieter than a typical whisper. Expect more fan noise at higher loads or during fast charging.
Backup features in the app
EcoFlow’s app includes Storm Guard, which watches severe weather alerts and starts AC charging ahead of a storm. It also offers Self-Powered mode and Scheduled Tasks for charging during off-peak hours. EcoFlow notes that some of these features need app version 6.15 and firmware 7.80.99.52 or newer.
Runtime estimates
These assume about 85% of the battery’s rated capacity reaches your appliances, my planning figure rather than EcoFlow’s.
| Load (typical average) | 3,072Wh base (estimate) | With two extra batteries, about 11kWh (estimate) |
|---|---|---|
| Fridge, 100W average | About 26 hours | About 3.9 days |
| Fridge + router + lights + phone charging, 200W | About 13 hours | About 47 hours |
| CPAP with humidifier, 60W | About 43 hours | About 6.5 days |
| RV rooftop AC, 1,300W running | About 2 hours | About 7 hours |
| Microwave, 1,200W for 10 minutes a day | Over 10 days of use | Over a month of use |
For the 11kWh column I used EcoFlow’s “about 11kWh” figure. Actual extra-battery capacity depends on the model you add.
Solar charge times
| Array | Realistic input (estimate) | 0–100% (estimate) |
|---|---|---|
| 400W on one port | About 300W | About 10 hours of good sun |
| 800W on one port | About 600W | About 5 hours |
| 1,600W across both ports | About 1,200W | About 2.5 hours |
“Realistic input” assumes panels deliver about 75% of their rating, which is typical in good sun but varies with season, heat and angle.
Things to know before you buy
- Plan solar strings around 60V. Each port tops out at 60V. Check your panels’ open-circuit voltage, and remember it rises on cold mornings.
- The 1,800W wall charger needs a good circuit. 1,800W at 120V is 15A, the full rating of a standard household circuit. Charging on a circuit shared with a space heater or microwave can trip the breaker. Use a circuit with nothing else heavy on it.
- It’s 120V only. For a 240V well pump, dryer or EV-level charging, you’d need a different system.
- Mind the temperature window. EcoFlow lists charging from 32°F to 113°F and says the battery works best between 68°F and 86°F. In winter, keep it in a heated space while charging.
- Register it for the full warranty. The extra two years of coverage require registration in the EcoFlow app.
Who it’s for
- RV owners and full-timers: TT-30 outlet, 12V Anderson port, alternator charging and 1,600W of solar make it a near drop-in power system.
- Home backup for essentials: 3,600W runs a fridge, well pump or microwave, and expansion gives multi-day runtime. UPS under 10ms covers routers and computers.
- Off-grid cabins: two independent solar inputs let you mix arrays, and the expansion port lets the bank grow with you.
It’s less suited to carrying any distance. At about 74 pounds, it has wheels and a handle, but you won’t want to lift it into a truck bed often. For something you’ll move every weekend, look at a 1–2kWh unit. If you need whole-home backup with 240V, EcoFlow’s DELTA Pro Ultra is the bigger system.
How it compares
Against the original DELTA Pro, the Ultra Plus is about 25 pounds lighter, switches faster and has more modern USB-C ports, while the DELTA Pro holds more energy and expands further. We cover that matchup in DELTA 3 Ultra Plus vs DELTA Pro. For a cross-brand option, see Anker SOLIX F3000 vs EcoFlow DELTA 3 Ultra.
FAQ
How much solar can the DELTA 3 Ultra Plus take?
Up to 1,600W: 800W on each of its two XT60 ports, at 11–60V and up to 18A per port.
Does it have 240V output?
No. EcoFlow lists 120V output only, with a 30A TT-30 outlet for RVs.
Can I expand the battery?
Yes. EcoFlow says it scales to about 11kWh with two DELTA Pro 3 Extra Batteries.
Is it a UPS?
EcoFlow lists switchover under 10ms, fast enough for most computers, routers and NAS drives.
How heavy is it?
33.7kg (plus or minus 0.6kg), or about 74 pounds.
What’s the warranty?
Five years: three standard plus two more when you register it in the EcoFlow app.
Can I charge it while driving?
Yes. The DC input accepts 12V at up to 8A, which is roughly 100W from a car socket (my estimate), so it’s a slow top-up. For real road charging, EcoFlow’s 800W Alternator Charger connects to a solar port and is far quicker.
Can it run an RV air conditioner?
A typical 13,500–15,000 BTU rooftop unit runs on 1,300–1,800W, well within the 3,600W rating, and the 7,200W surge rating gives headroom for the compressor’s start-up spike. Check your unit’s locked-rotor amps if you’re unsure. Runtime is the limit: about two hours on the base battery (estimate).
Bottom line
The DELTA 3 Ultra Plus is a strong fit if you want one battery that can serve an RV, a cabin and home backup. Its two 800W solar inputs, TT-30 outlet, 12V Anderson port and expansion to about 11kWh are the reasons to choose the Plus over the base Ultra. If you never plan to add solar or batteries, the base model saves money with the same 3,600W inverter.