EF ECOFLOW Portable Power Station Delta 2, 1024Wh LiFePO4 (LFP) Battery, 1800W AC/100W USB-C Output, Solar Generator(Solar Panel Optional) for Home Backup Power, Camping & RVs

Really fast charging, but also really loud fan (for up to 60 mins). Excellent engineering otherwise
EcoFlow announced the Delta 2 power station at IFA Berlin 2022 with the tagline of: “Not Just a Battery.” It was available for purchase on September 16, 2022. After their excellent Delta Pro we reviewed not too long ago for our vacation home, we were very intrigued by what this new product could do, and how it would compare against Goal Zero and Jackery.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 warrantyEcoFlow, 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 BATTERYI 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 TECHNOLOGYThere 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: 300LiFePO4 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 OUTPUTIt 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 onMost 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 downCALCULATIONSThe 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 throughWatts 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 120WIdeal 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 THOUGHTSEcoFlow 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.

One of the Best Portable Powerful Solar Generator Battery Back Up Systems
The Ecoflow Delta 2 build quality is very good and lightweight for portability. It is easy to carry with two convenient handles. It has a 1KW capacity expandable to 3 KW. The output is 1800 W which can go to 2400 W with X Boost. This is enough power for most applications for a small cabin, camping, remote power for DJ applications, emergency power back up, survival emergency and for reducing your electric bill in your home. It fast charges to 80% in 50 minutes. There are four USB A ports on the front of the unit. There are two USB C ports. There is an side port for an extra battery in serial connection. There are 4 AC ports on the other Output side. There are solar, car and main charging ports stacked together.This is one of the best units available with the preferred Lithium iron phosphate battery.It is priced well in a crowded market and Ecoflow has a very good Ap that manages this unit.

A second update has been added to the end of this review.A quick update: The power station sat for a couple of months after the most recent charge. Today I decided to discharge and recharge it. It still showed 100% charge when turned on and ran a small portable room air conditioner for over half an hour. It still had 50% charge and didn’t get even slightly warm. The AC unit draws about 900 watts.This is truly an impressive device!Original review:I have used this power station only for a few days and so far it has proven to be easy to use and it delivers the performance advertised.It is quick to charge, even at a much lower charge rate than maximum. It is not particularly loud when charging.I have tested it by using it to power my CPAP machine. In this application, it is silent. I calculate it would be able to operate the CPAP machine between 4 and 7 nights. My machine heats the humidifier water and the breathing tube. Other machines might do even better if they don’t have these features.We recently experienced a once-every-30-year ice storm and were without electricity for about 4 ½ days. I wish I had this power station during the blackout, but I am quite confident it will serve us well now that we have it.Our freezer just barely kept most if the food safe, but running it for an hour or two once or twice a day would certainly extend that safety margin considerably, and the power station could probably handle that for a day or two and still provide adequate cell phone charging and enough time on the CPAP machine to keep me safe for a few nights.The unit itself was well-packaged. The instructions are clear, and the app fairly simple and useful. The unit itself is not visibly intrusive, it’s quite compact and seems very well made.These days we are almost shamefully dependent on our electric and electronic devices, which are getting very energy efficient. Also this dependency is much more pronounced as we live longer.All in all a great purchase, which I hope never to actually need to use, but I am very sure we will need it sooner or later.Second update: About 14 months after the terrible power outage last year I bought a second Delta 2. The first one has performed perfectly, particularly during a fairly lengthy power outage a couple of months ago.I have been considering how to increase my reserve capacity: Should I get an auxiliary battery or a second power station?The price is about the same, but having 2 complete units seems to be more flexible. I had an opportunity to get a second Delta 2 for about ⅓ off the regular price, so that became my choice.It’s so impressive how the power station pretty much sets itself up once plugged in, the app is opened on my phone and I touch h to the + button to add a new device.This is now my third EcoFlow unit because I bought a River 2 just for my CPAP machine about 6 months ago, and it has kept me safe on quite a few occasions.I feel very confident that we will be able to manage well during any future power interruptions.

I’ve had a few opportunities to test this solar system out. My wife was working while camping, and will the laptop computer AND the Starlink plugged in, the battery was actually gaining charge from the panels. Mind you, I had to keep moving the panels to face the sun at the best angle, but it was easily doable. The app for the phone makes it super simple to see what the Input and Output are. From 0%, it took the 220 panels about 7 hrs to fully charge the batter to 100%. This was the best price around, better that Costco.