I read a lot of reviews and watched many videos before buying the Ecoflow Delta2.
My main use for this Delta2 is for overnight camping trips and use as a back-up power in case of black-out conditions to run some equipment like Refrigerator and be able to heat food using the microwave.
Delta2 doesn't have the battery capacity like Delta Pro but with a good solar panel it can definitely come handy when required. One can always add an additional battery that again works seamlessly to extend the battery capacity or buy the Ecoflow Smart Generator.
I was debating between Bluetti EB70s and Ecofow Delta2.
The reason I bought Delta 2 over Bluetti was the battery capacity. Delta 2 provides 1024WH as compared to the 716WH from the EB70s. Delta 2 met the power requirements that I was looking for. I could not find any offering by Bluetti in the range of 1000WH capacity. Delta 2 was of course more expensive than Bluetti but the surge power (also called X-BOOST by Ecoflow) is really high. So running a microwave for a short time or a coffee machine at a campsite or picnic is not an issue at all. I bought a combo pack (Delta 2 and solar panel). More about this combo later in the review.
The other reason was the 5 year warranty that comes with the Ecoflow Delta2 vs 2 years for Bluetti. Some models from Bluetti do offer 4 years but were expensive for my use.
Below are a few things I like about Ecoflow Delta2 after using it for sometime.
1) Construction - This is a solid built product. The bottom edges have these rubber bumpers for extra protection. The form factor is designed well to fit in the car. I hope the handles were not protruding out as they are now and were more integrated into the main box. The box is strong and one can easily put heavy items on the top without any issues. With the LFP battery and 3000 battery cycles, the Delta 2 will last forever.
2) Display - It's big and clear. Very easy to read even on a bright day. All the connections that are turned on are shown on the display even when a load is not connected but for USB only when a load is connected, the icon is displayed. Not sure why only the USB icon behaves like that. Not an issue at all but just wondering why a different behavior as compared to other connections.
3) App and Connectivity - The phone app works great and it's very easy to use. There are so many options that you can set via the app. Connecting the Delta 2 to the app was a breeze. It connects to WiFi without any issue and also to bluetooth. The app shows correct data 99.9% of the time. Once in a while you have to refresh (close/open) the app to get the latest data. It is very rare but I did notice it.
When the WiFi is available, the Delta 2 connects via WiFi. If there is no WiFi connection, it automatically switches to Bluetooth connection. The connection is just seamless and you are always connected to the Delta 2.
4) Charging - Delta 2 can charge at a whopping 1200W to be ready from 0% to 100% in about just 80 minutes. The fans do kick-in to dissipate all the heat generated during this fast charging. I personally charge the unit at 500 W with fan running but much less noisier and may be better for the battery life.
The solar charging can go up to 500 W. I don't have enough solar panels to check that max limit but this can be a really handy feature during a blackout conditions or with limited hours of sun during camping.
One can charge the battery before leaving camping or any other work. Charge while driving from the 12V DC outlet in the car (Also known as the Cigarette lighter port) and the battery will be 100% when you reach your camp/work site.
5) Output Connections - There are more than enough connections that one can use, in my view. With a massive 1800 W peak capacity and 2700 W of surge capacity, I think you can run almost any home appliance with this Delta 2. The provided ports like USB A, USB C, Power Outlets and 12 V (Car type) are good to power any device you may have.
Now coming to the combo I got. I bought the combo of Delta 2 and Solar Panels that were rigid. I was not happy with the size and format of rigid panels so I reached the Ecoflow support team. Even though I made that choice and now wanted to get portable panels, the Ecoflow team worked with me. The support team was amazing with quick responses and answering all the questions I had. It was good to see Ecoflow believes in good customer service that still cares about their customers. One of the best customer service teams I have worked with.
One option that I would like Ecoflow to add will be to set the discharging and charging percentages even when connected to the power outlet. I would like to connect a solar panel for charging and connect my garage refrigerator to Delta 2 and use the battery power. If the battery falls below a certain level (let's say 30%) it can charge via the power outlet, else the refrigerator can keep running via the solar power. This option is provided when you connect a Ecoflow smart generator to Delta 2 but not when connected to a power outlet. I hope Ecoflow will implement this feature in the future software update.
EF ECOFLOW Portable Power Station Delta 2, 1024Wh LiFePO4 (LFP) Battery, 1800W AC/100W USB-C Output, Solar Generator(Solar Pa
4.4 | 2,198 ratings
Price: 699
Last update: 01-11-2025
About this item
7 X Faster Charging. 0-80% in just 50 mins and 0-100% in 80 mins with AC input. That's ideal when you need home backup power and a quick charge using your wall outlet.
Expandable Capacity from 1-3kWh. With the standalone portable power station sporting 1kWh, you can add on extra batteries to reach up to 3kWh. Ideal for camping, RVs or off-grid living.and a quick charge using your wall outlet.
Power Almost Anything. Portable batteries have come a long way. Power all your appliances with 1800W output, that's on par with outdoor generators without the fumes or noise. With 15 outlets and its huge output, you can power 90% of your appliances.
Clean, Green Charging. With up to 500W of solar panel input, DELTA 2 is a solar generator that can be charged while camping, on an RV trip or off-grid.
Built to Last 6x Longer. Its LFP(LiFePO4) battery chemistry makes for a portable power station with a 3000+ cycle life. Enough for years on end of use. With a sophisticated BMS, you can go easy knowing its auto-regulating to keep you safe.
What's in the Box. EcoFlow DELTA 2 portable power station, AC charging cable, Car charging cable, DC5521 to DC5525 cable, User manual, and an exclusive 5-year customer service.
Expandable Capacity from 1-3kWh. With the standalone portable power station sporting 1kWh, you can add on extra batteries to reach up to 3kWh. Ideal for camping, RVs or off-grid living.and a quick charge using your wall outlet.
Power Almost Anything. Portable batteries have come a long way. Power all your appliances with 1800W output, that's on par with outdoor generators without the fumes or noise. With 15 outlets and its huge output, you can power 90% of your appliances.
Clean, Green Charging. With up to 500W of solar panel input, DELTA 2 is a solar generator that can be charged while camping, on an RV trip or off-grid.
Built to Last 6x Longer. Its LFP(LiFePO4) battery chemistry makes for a portable power station with a 3000+ cycle life. Enough for years on end of use. With a sophisticated BMS, you can go easy knowing its auto-regulating to keep you safe.
What's in the Box. EcoFlow DELTA 2 portable power station, AC charging cable, Car charging cable, DC5521 to DC5525 cable, User manual, and an exclusive 5-year customer service.
Product information
| Brand | EF ECOFLOW |
|---|---|
| Wattage | 1800 watts |
| Power Source | Solar Powered |
| Recommended Uses For Product | Camping |
| Item Weight | 27 Pounds |
| Voltage | 120 Volts |
| Output Wattage | 1800 Watts |
| Special Feature | Plug and play home backup power, Or go green without sacrificing speed, Huge AC output, Expandable capacity, 7x Faster AC charging |
| Included Components | DC5521 to DC5525 Cable, User Manual, DELTA2 Power Station, AC Charging Cable, Car Charging Cable |
| Color | Black |
| Product Dimensions | 15.7"L x 8.3"W x 11.3"H |
| Model Name | DELTA 2 |
| Frequency | 50 Hz |
| Engine Power Maximum | 2700 Watts |
| Starting Wattage | 2700 Watts |
| Is Electric | Yes |
| UPC | 842783119520 |
| Manufacturer | EF ECOFLOW |
| Item Weight | 27 pounds |
| ASIN | B0B9XB57XM |
| Item model number | EFD330 |
| Customer Reviews |
4.6 4.6 out of 5 stars
1,220 ratings
4.6 out of 5 stars |
| Best Sellers Rank | #8,419 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden) #44 in Outdoor Generators |
Top reviews from the United States
TechGuy
One of the best portable storage you can buy
Reviewed in the United States on November 30, 2022Moto
Stay Powered During Blackouts with the Easy-to-Use ECOFLOW Portable Power Station DELTA 2!
Reviewed in the United States on July 3, 2024
YuenX
Really fast charging, but also really loud fan (for up to 60 mins). Excellent engineering otherwise
Reviewed in the United States on September 18, 2022
YuenX
Reviewed in the United States on September 18, 2022
The Delta 2’s 1,024Wh battery capacity — how long something can run for — and price point puts it right in direct competition with the identically priced Goal Zero Yeti 1000x and Yeti 1000 Core, Jackery Explorer 1000, and its own predecessor, the EcoFlow Delta 1000 — but with one major change. Instead of using Nickel Manganese Cobalt (NMC), the Delta 2 now uses Lithium Iron Phosphate (LiFePO4) like its more powerful Delta Pro sibling. There are significant differences between both Lithium-ion (Li-ion) battery chemistries that I will detail later.
How much energy a battery can store is measured in Wh (Watt-hours), and how much power is used or produced in W (Watts).
Goal Zero launched the Yeti 1000 Core power station on July 16, 2021, five weeks after the flagship Yeti 1000x was available for purchase, and the Delta 2 packs more powerful features with its announcement a year later:
- LiFePO4 battery chemistry (Pros and Cons to that over NMC)
- 1,200W AC charging input
-- Rapid-charging from 0 to 80% in an unheard of 50 minutes — a claim I personally verified to be accurate
--- Test #2: 36% to 88% in 32 minutes (4:34pm to 5:06pm)
-- Fans were VERY loud during that time and significantly got more quiet around the 90% charged mark
--- If fan noise is important to you because of a tight sleeping quarter, be mindful of that. On the other hand, it would only take 50 minutes to go from 0 to 80% charge. So, charge before you go to sleep.
FAN TOO LOUD?
You can lower the charging speed from 1200w to 600w via the app, and the fan won't be as loud.
- 500W solar charging input (11-60V @ 15A)
- Whopping 15 outlets
-- AC output at a Continuous 1,800W and Peak of 2,700W
-- X-Boost output at 2,200W
-- USB-C at 100W
- Mobile app control via WiFi or Bluetooth
- Near-instant auto-switching between AC and battery power
-- Makes it suitable for use as a Standby Power Supply (SPS) during a blackout
- Expansion options
-- Battery capacity expansion to a total of 2,048Wh or 3,040Wh with the Delta 2 Extra Battery (+1,024Wh) or Delta Max Extra Battery (+2,016Wh), respectively
--- Only the Goal Zero Yeti 1000x (983Wh) has expansion capabilities in this 1,000Wh-battery roundup to a total of 5,783Wh (938Wh + four 1,200Wh Yeti Tanks)
-- Connectivity with solar panels, the EcoFlow Wave portable air conditioner, and EcoFlow Smart Generator
- 5-year warranty
EcoFlow, Goal Zero, and Jackery power stations can be used while simultaneously charging themselves.
Sweet Spot: The 1000Wh battery capacity hits the sweet spot for many consumers, including this author, who are looking for the right balance of power and portability. But when it comes to home integration, the more Watt-hours a battery ecosystem offers, the longer one can power a home for during a blackout.
PAIRING WITH EXTRA BATTERY
I paired the Delta 2 Extra Battery (EB) with this Delta 2 power station. I was happy to see that chaining the EB to the Delta 2 and charging it from the AC wall produced about 1100W of input. This fully charged the EB in about an hour. Without the AC wall, it sipped only about 54W directly from the Delta 2 -- this would charge an empty EB from 0 to 100% in 19 hours.
When plugged in to the AC wall, the Delta 2's fans were very loud just like when it charged standalone at 1100-1200W input. Once the Extra Battery was at around 90%, charging dropped to roughly 700W and the Delta 2's fans lowered manageably quieter.
Note: Delta 2 Extra Battery cannot be independently charged. It must be connected to the Delta 2.
BATTERY TECHNOLOGY
There has been a lot of debate on whether Nickel Manganese Cobalt (NMC) or Lithium Iron Phosphate (LiFePO4) is better. Both are Lithium-ion batteries. Goal Zero, Jackery, and most of today’s power station manufacturers use NMC, but why do EcoFlow and Bluetti use LiFePO4 when they are bulkier and heavier? They hold some important advantages over NMC:
- Safer, less volatile, and thus cheaper to manufacture
- Charge cycle: 1500-2000 (10+ years)
-- NMC: 20-25% capacity loss after every 500 cycle (6-10 years for up to 2000 cycles, after which capacity is vastly diminished)
-- EcoFlow claims 3500 cycles before dropping to 80% of original capacity and 6500 to 50%. Those are some VERY optimistic projections that I do not think are accurate in actual usage
- Usable in more extreme temperatures (-4F/-20C to 176F/80C). NMC: only 140F/60C max
-- Check with manufacturer for your battery to be sure
- Holds 350-day charge. NMC: 300
LiFePO4 batteries are less volatile (safer), more usable in extreme temperatures, and have a higher charge cycle count (battery lifetime) than NMC.
CAUTION: Lithium-ion batteries do NOT like to remain discharged at 0% for prolonged periods of time. If you let your battery stay at 0% for too long, you may not be able to charge it again without specialized equipment.
CONTINUOUS VS PEAK OUTPUT
It is important to understand the difference between Watts and Watt-Hours. How much power is used or produced is measured in Watts, and how much energy a battery can store is calculated in Watt-Hours. See the “Calculations” section below for more details.
How much energy a battery can store is measured in Wh (Watt-hours), and how much power is used or produced in W (Watts).
- AC Inverter: Converts battery (DC) power into AC
-- Delta 2 provides 1,800W continuous output with a 2,700W peak
- Peak/Surge (Starting): Nearly every device initially draws extra power to turn on. The highest amount it pulls is the Peak. As long as that number is below 2,700W, it can be STARTED. Examples…
-- Turns on OK (PEAK under 2,700W):
--- Freezer starts at 400W (peak), runs at 150W once on
-- Will NOT turn on (PEAK over 2,700W):
--- Home AC starts at 4,000W (peak), runs at 1,000W once on
Most devices power on at a higher (Peak) wattage than when they are already on (Continuous). Therefore, if its peak exceeds the power station's max, it may not be able to start
- Continuous Output (Running): Once devices are on, as long as they keep drawing less than 1,200W total, they will stay ON until the battery runs out
-- CONTINUES running (under 1,800W)
--- 100W TV + 60W laptop = 160W
-- COULD STOP running (over 1,800W)
--- Temporary overdrawing beyond 1,800W for a few seconds is okay. A quality BMS will protectively shut down the battery if the surge does not end after a while. Regularly going over for a prolonged time can ruin the battery in the long run
--- 1,000W machine (2,100W peak) + 300W appliance (500W peak) + 700W appliance (900W peak) = 2,000W. Probably will stay on for a short period
---- Add 1,000W mower (1,400W peak) = 2,300W. Battery will definitely shut down
CALCULATIONS
The below calculations are rough ESTIMATES as conditions, battery quality, and age can vary. [SORRY: I had to shorten my original review by a LOT (including many calculations) so it could fit here on Amazon.]
Time to Charge This 1,024Wh Power Station
- Calc: Hours to charge battery = Battery capacity (Wh) / Input Wattage
-- As battery approaches 75% full, the input charge will increasingly be slowed down to prevent overcharging
- AC Wall: 1180W @ 52 mins [1024 Wh / 1180W]
- 12V Car Charger
-- 120W @ 8.6 hrs (at 10A, if car supports it)
Charge Time with Solar
- Calc: Hours to charge battery = Battery capacity (Wh) / (Panel Wattage x [0.5 or 0.75])
-- In a perfect lab, solar panels charge at the listed wattage
-- Expect to only receive 50-75% on a good, sunny day (ie. 75W – 113W for a 150W panel), depending on panel's age, component quality, and weather
- 200W solar panel: as fast as 6.9 hours [1024Wh / (200W x 0.75)]
- Underproduction: If a panel is not making enough, adding extra ones can generate a higher, combined output
- Overproduction: If the panels make more than the maximum the power station charge port can take, only the max will go through
Watts Used/Produced by a Device
- Calc: Watts used or produced by device = Voltage x Amperage
- Vacuum with 120V @ 9.5A uses 1,140W
- Solar panel with 12V @ 10A can produce up to 120W
Ideal Battery Power Station Size
- Calc: Battery capacity (Wh) = Watts used by device x Hours needed for / 0.85
-- 10-15% of power is lost during power conversion
- 45W car fridge needed for 8 hours: Minimum 424Wh power station (45W x 8 / 0.85)
FINAL THOUGHTS
EcoFlow thoroughly impressed us with their Delta Pro power station and quickly added the company to our list of recommended battery providers. Their newest Delta 2, now a LiFePO4 product, further surprised us with 1,200W rapid-charging that took the battery from 0 to 80% in a whopping 50 minutes! Had we not seen that in person, we would have dismissed it as a marketing gimmick, but we were proven wrong. Add to that the ability to have its capacity and features expanded with additional products, and the Delta 2 makes for a VERY compelling choice against Goal Zero’s own Yeti 1000x that is starting to show its age. Jackery, on the other hand, is extremely difficult to recommend against the Delta 2, except that they have excellent customer service and consumer-friendly policies.
Images in this review
