EcoFlow’s DELTA 2 and RIVER 2 Pro are two LiFePO4 power stations that sit one size apart in the lineup, and EcoFlow’s own documents make the gap clear. The DELTA 2 user manual lists a 1,024Wh battery, six AC outlets and 1,800W of continuous output. The RIVER 2 Pro’s US product page and manual list 768Wh, four AC outlets and 800W. Both are rated for 3,000 cycles to 80% capacity. The deciding question is simple: do you need to run 1,000W-class appliances, or do you need something you can carry with one hand? This guide works through that question using EcoFlow’s published specs, with every runtime figure labeled as an estimate.
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EcoFlow DELTA 2 on EcoFlow · EcoFlow RIVER 2 Pro on Amazon · RIVER 2 Pro on EcoFlow
The Short Answer
- Pick the DELTA 2 if you want to run a microwave, coffee maker, space heater or power tools, or if you might add an extra battery later. It has 1,800W of output, six AC outlets and expansion support.
- Pick the RIVER 2 Pro if your loads stay under 800W (CPAP, laptops, a 12V fridge, a router, lights) and weight matters. It weighs about 17–18 lb against the DELTA 2’s roughly 27 lb.
Most of the decision comes down to the 800W versus 1,800W output limit. Capacity matters less: the DELTA 2 holds only about a third more energy, but it can run more than twice the load.
Spec Sheet Side by Side
The DELTA 2 figures come from the EcoFlow DELTA 2 user manual (US model, 120V). The RIVER 2 Pro figures come from EcoFlow’s US product page and manual.
| Spec | EcoFlow DELTA 2 | EcoFlow RIVER 2 Pro |
|---|---|---|
| Capacity | 1,024Wh (51.2V) | 768Wh |
| Chemistry / cycles | LFP, 3,000 cycles to 80%+ | LFP, 3,000 cycles to 80% |
| AC output | 1,800W total, 2,700W surge, pure sine | 800W total, pure sine |
| X-Boost | Up to 2,200W devices | Up to 1,600W devices |
| AC outlets | 6 | 4 |
| USB-C | 2 × 100W | 1 × 100W |
| USB-A | 2 × 12W + 2 × 18W fast charge | 3 × 12W |
| 12V car outlet | 12.6V, 10A (126W) | 12.6V, 10A |
| DC5521 | 2 × 38W (shares 126W with car outlet) | 2 |
| AC charging | Up to 1,200W (X-Stream) | Up to 940W |
| Solar input | 11–60V, 15A, 500W max | 11–50V, 13A, 220W max |
| Car charging | 12V/24V, 8A default | 12V/24V, 8A |
| Weight | About 27 lb (12 kg) | 17.2 lb (manual); 18.2 lb (product page) |
| Dimensions | 15.7 × 8.3 × 11.1 in | 10.6 × 10.2 × 8.9 in |
| Expansion | Smart Extra Battery, Smart Generator supported | None |
| Connectivity | Wi-Fi and Bluetooth | EcoFlow app |
What 800W vs 1,800W Means in Practice
Output is a hard limit, unlike capacity. If a device pulls more than the inverter’s rating, the station shuts off the AC output rather than running it slowly. Here’s how common household loads line up against each limit. Wattages are typical nameplate values; check the label on your own appliance.
| Appliance (typical draw) | DELTA 2 (1,800W) | RIVER 2 Pro (800W) |
|---|---|---|
| CPAP without humidifier (30–60W) | Yes | Yes |
| Laptop (45–100W) | Yes | Yes |
| Full-size fridge (150–200W running) | Yes | Yes, but check startup surge |
| Blender (500–700W) | Yes | Usually |
| Drip coffee maker (900–1,100W) | Yes | No |
| Microwave (1,000–1,500W input) | Yes | No |
| Space heater on high (1,500W) | Yes | No (X-Boost at reduced voltage only) |
| Circular saw (1,200–1,800W) | Most models | No |
X-Boost needs a word of caution. Both units can “accept” a heating appliance above their rating by lowering the voltage, so a 1,500W kettle runs at reduced power and heats more slowly. The RIVER 2 Pro manual warns that X-Boost isn’t suitable for appliances with voltage protection, and it isn’t a good fit for microwaves or motors. If you need to run a 1,000W+ appliance at full power, the DELTA 2 is the one that does it natively.
Runtime Estimates
These are our estimates, not EcoFlow test results. They assume about 85% of rated capacity is usable after inverter losses (roughly 870Wh for the DELTA 2 and 650Wh for the RIVER 2 Pro). Real results shift with temperature, battery age and how steady the load is.
| Load (average draw) | DELTA 2 estimate | RIVER 2 Pro estimate |
|---|---|---|
| Wi-Fi router + modem (20W) | ~43 hours | ~32 hours |
| CPAP (40W) | ~21 hours (2–3 nights) | ~16 hours (about 2 nights) |
| 12V compressor fridge via AC (60W average) | ~14 hours | ~11 hours |
| Home fridge (120W average cycling) | ~7 hours | ~5 hours |
| Microwave (1,000W) | ~50 minutes of total run time | Not supported |
| Space heater (1,500W) | ~35 minutes | Not supported |
For reference, EcoFlow’s DELTA 2 page quotes 7–14 hours for a 120W fridge and 16–32 hours for a 60W car fridge. Those ranges sit close to our estimates. Running a 12V fridge from the car outlet instead of AC skips the inverter and usually stretches runtime further.
Charging: Wall, Solar and Car
From the wall
Both units charge fast. EcoFlow says the DELTA 2 reaches 80% in 50 minutes and 100% in 80 minutes at up to 1,200W. The RIVER 2 Pro charges at up to 940W and reaches 100% in about 70 minutes. In practice that’s close to a tie, because the DELTA 2 pushes more power into a bigger battery.
From solar
Solar is the bigger difference. The DELTA 2 accepts 11–60V at up to 15A and 500W, while the RIVER 2 Pro tops out at 11–50V, 13A and 220W. EcoFlow quotes a full DELTA 2 solar charge in as little as 3 hours. Our rough math for the RIVER 2 Pro is about 3.5 hours under a perfect 220W, and longer on a normal day, since panels rarely deliver their full rating. Luis’s own field results show how big that gap can be: his BLUETTI 60W panel measured 35–40W in real sun.
| Solar setup | DELTA 2 | RIVER 2 Pro |
|---|---|---|
| Max solar watts | 500W | 220W |
| Voltage window | 11–60V | 11–50V |
| One 200W panel (~140W real-world estimate) | ~7 hours to full | ~5.5 hours to full |
| Best-case full charge | ~3 hours (EcoFlow) | ~3.5 hours (our math at 220W) |
With the DELTA 2, check your panel string’s open-circuit voltage (Voc) against the 60V ceiling. Two 100W 12V-class panels in series (around 22–24V Voc each) fit comfortably, but three in series can come close to the limit in cold weather. Our RIVER 3 Plus solar charging guide walks through the same Voc check for smaller EcoFlow units.
From the car
Both charge from a 12V or 24V socket at a default 8A. At 12V that’s roughly 100W, so a full charge from empty takes about 10 hours for the DELTA 2 and about 8 hours for the RIVER 2 Pro (our estimates). If you drive a lot, a dedicated alternator charger is far faster. See our EcoFlow 800W alternator charger setup for that route.
Carrying Them Around
The RIVER 2 Pro is close to cube-shaped at 10.6 × 10.2 × 8.9 inches and weighs 17–18 lb, depending on which EcoFlow document you read. The DELTA 2 is longer and flatter at 15.7 × 8.3 × 11.1 inches, and at about 27 lb it’s a two-handle lift for many people.
For car camping where the station lives in the trunk, the extra 9–10 lb hardly matters. For walking it from a parking lot to a campsite, or moving it between rooms every night for a CPAP, it does. For apartment dwellers, the RIVER 2 Pro’s smaller footprint is also easier to tuck under a desk as a router backup.
Room to Grow
The DELTA 2 manual lists support for EcoFlow’s Smart Extra Battery and Smart Generator, both sold separately. EcoFlow’s DELTA 2 page says capacity can grow to 2kWh or 3kWh with an extra battery. That makes the DELTA 2 a reasonable starting point for a small home backup setup that you build out over time.
The RIVER 2 Pro has no expansion port. Its 768Wh is all you’ll get, so if you think you’ll want more capacity later, factor that in now. Buying a second station later costs more than adding an extra battery.
Three Real-World Scenarios
Weekend car camping for two
Loads: a 12V fridge, phone and camera charging, LED lights, and maybe a laptop. Daily use usually runs 400–700Wh. Both units handle this, and the RIVER 2 Pro’s lighter weight is a plus. The DELTA 2 pulls ahead if you want to use an electric kettle or induction plate at full power, or if you plan to recharge with more than 220W of solar. Our 12V fridge runtime breakdown shows why running the fridge from DC rather than AC saves energy.
Power outage at home
Loads: a fridge, router, phone charging and a few lights. The DELTA 2’s 1,800W leaves headroom for a fridge’s startup surge plus a microwave for reheating, and its six outlets cover more devices. The RIVER 2 Pro can keep a fridge and router going for several hours, but it’s the tighter fit. For longer outages, the DELTA 2’s expansion support is the key advantage.
Home-office UPS
Loads: a desktop PC, monitor, and router or modem, typically 150–400W combined. EcoFlow lists the RIVER 2 Pro’s EPS switchover at under 30ms, and the DELTA 2 page describes an AC Always-On transition. If your desktop is sensitive to switchover gaps, test it with the station before you rely on it. Either unit covers the wattage; the RIVER 2 Pro is quieter to place on a desk, though EcoFlow notes it can reach 62 dB under heavy charge or discharge.
Price and Availability
When we checked EcoFlow’s US store, the RIVER 2 Pro was listed at $389 (regular $529), but every variant showed as out of stock, so it may be winding down. Amazon still had a live listing at the time of writing. Check EcoFlow’s DELTA 2 page for current pricing; both models now sit alongside their newer successors (the RIVER 3 and DELTA 3 series), so prices move often. If either of these is sold out, our RIVER 2 Pro vs RIVER 3 Plus comparison covers the newer RIVER option, and the Delta 3 Max vs Delta 2 Max guide covers the larger DELTA models.
FAQ
Is the DELTA 2 worth the extra weight over the RIVER 2 Pro?
Yes, if you’ll run anything over 800W, such as a microwave, coffee maker or space heater. If your loads stay under 800W, the RIVER 2 Pro does the same job and is about 9–10 lb lighter.
Can the RIVER 2 Pro run a microwave?
Generally no. Most microwaves draw 1,000W or more from the wall, which is above the RIVER 2 Pro’s 800W rating, and X-Boost isn’t suited to microwaves.
Can I add an extra battery to either one?
The DELTA 2 supports EcoFlow’s Smart Extra Battery, which EcoFlow says takes it to 2kWh or 3kWh. The RIVER 2 Pro has no expansion option.
Which charges faster on solar?
The DELTA 2. It takes up to 500W of solar compared with 220W for the RIVER 2 Pro, and EcoFlow quotes a full DELTA 2 solar charge in as little as 3 hours.
Do both use LiFePO4 batteries?
Yes. Both use LFP (LiFePO4) cells rated for 3,000 cycles to 80% capacity.
How many AC outlets does each have?
The DELTA 2 has six AC outlets and the RIVER 2 Pro has four, all pure sine wave at 120V.
Can either charge in freezing weather?
The DELTA 2 manual lists a charging range of 32–113°F (0–45°C) and discharging down to 14°F (-10°C). Keep either unit somewhere above freezing when you plan to charge it.
Bottom Line
The DELTA 2 is the more capable all-rounder. It runs 1,800W of appliances, takes up to 500W of solar, has six AC outlets and supports an extra battery for long outages. The RIVER 2 Pro is the lighter, smaller choice for loads under 800W, and it still holds 768Wh with the same LiFePO4 cycle rating. Start with the biggest appliance you need to run. If it’s over 800W, get the DELTA 2. If it isn’t, and you’ll carry the station often, the RIVER 2 Pro makes sense, as long as you can still find one in stock.