EF ECOFLOW DELTA 2 MAX Power Station with Smart Extra Battery, Expand Capacity from 2048Wh to 4096Wh, Solar Generator for Home Backup, Emergency, Outdoor Camping
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Style: DELTA 2 Max+Extra Battery
Features
- Fuel up 80% in Only 43 Mins. With DELTA 2 Max's upgraded tech, combine up to 1000W solar input with AC for world-leading charging speeds. In only 43 min get an 80% charge. Or stick with AC for an 80% charge in a speedy 1.1 hour.
- 10-Year Long-Lasting LFP Battery. LFP battery chemistry provides 3000 cycles till it lowers to 80% capacity. That's 6 more cycles than the industry average and more cost-efficient. EcoFlow DELTA2 Max electric generator also comes with an extended 5-year service.
- Expandable Capacity from 2kWh to 6kWh. Triple the capacity of DELTA 2 Max with up to 2 extra solar powered batteries. Customize your energy depending on your needs. With a plug-and-play design, it's easier than ever to prepare for blackouts.
- Power 99% of Your Household Devices. Run pretty much any of your home appliances with up to 2400W. With 15 outlets, there's space for any device, and using X-Boost mode, power high-wattage appliances with up to 3400W.
- Quiet Charging. With volume levels starting from only 30 dB, DELTA 2 Max outdoor generator is perfect for powering devices overnight without disturbing sleep. Use the EcoFlow app to manage your energy use, set automations, and more.
Brand: EF ECOFLOW
Wattage: 4096 Watt-hours
Fuel Type: electric
Power Source: Solar Powered
Recommended Uses For Product: Camping
Voltage: 120 Volts
Output Wattage: 2400
Special Feature: 10-Year Long-Lasting LFP battery, 2400W LFP Solar Generator, As Quiet as 30 dB, Expandable Capacity. Up to 6kWh, No fumes. No noise. No maintenance. See more
Included Components: EcoFlow DELTA 2 Max Power Station, Extra Battery, AC Charging Cable, User Manual
Color: black or dark gray
Wattage: 4096 Watt-hours
Fuel Type: electric
Power Source: Solar Powered
Recommended Uses For Product: Camping
Voltage: 120 Volts
Output Wattage: 2400
Additional Features: 10-Year Long-Lasting LFP battery, 2400W LFP Solar Generator, As Quiet as 30 dB, Expandable Capacity. Up to 6kWh, No fumes. No noise. No maintenance.
Engine Type: 4 Stroke
Ignition System Type: electric
Engine Displacement: 79 Cubic Centimeters
Total Power Outlets: 15
Engine Power Maximum: 2400 Watts
Starting Wattage: 2400 Watts
Running Wattage: 2400 Watts
Smart Home Compatibility: Smart Home Compatible
Frequency: 50 Hz
Runtime: 43 minutes
Brand Name: EF ECOFLOW
Included Components: EcoFlow DELTA 2 Max Power Station, Extra Battery, AC Charging Cable, User Manual
Model Name: DELTA 2 Max
Model Number: EFD350
UPC: 842783128720
Manufacturer: EcoFlow
Manufacturer Part Number: EFD310
Item Type Name: Outdoor Generators
Warranty Description: 5-year Warranty
Item Dimensions L x W x H: 12.2"L x 9.7"W x 20"H
Color: black or dark gray
Frequently asked questions
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This item is non-returnable:
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
Non-returnable. Transportation of this item is subject to hazardous materials regulation
View our full returns policy here.
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Top Amazon Reviews
Style: DELTA 2 Max+Extra Battery
Helped on power outage
Reviewed in the United States on April 11, 2026 by gary f.
Style: DELTA 2 Max+Extra Battery
These really come in handy when needing that extra power for little projects when electricity ports aren’t available in the middle of nowhere or using them during a power outage. I’ve purchased other models as well and they never let me down!
Reviewed in the United States on February 10, 2026 by Dean
Style: DELTA 2 Max+Extra Battery
EcoFlow is still is a high quality product for whenever or wherever power is needed. Peace of mind knowing I’ll have power now during hurricane season or just about anything. Easy to operate. I purchased the main unit and the extra battery to keep my home powered for long periods of time. Plus easy to recharge with sustainable energy using solar panels. Build your power station with support from EcoFlow. They will walk you through the steps on everything you’ll need for your in home power system. Plus you will want to have this power supply to just cut your electric bills.
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Reviewed in the United States on August 5, 2025 by ed
Style: DELTA 2 Max+Extra Battery
Two days after connecting we lost power for a good chunk of the day. This unit was connected to my refrigerator and my coffee maker. The unit made no sound while in use just put out the necessary power for over 5 hours that day. I didn’t check how much battery it used as the power came back on while I was out. I did note that we had lost power in the middle of the night also and I never noticed as my cpap was connected to another delta2. I now have several of these all keeping my necessities running when the power goes down.
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Reviewed in the United States on October 7, 2024 by David W Jackson
Style: DELTA 2 Max+Extra Battery
Love EcoFlow. Great products that work and awesome support.
Reviewed in the United States on February 22, 2026 by 3D Printer
Style: DELTA 2 Max+Extra Battery
I ordered my Delta 2 Max and Extra Battery over the weekend and it arrived the following Friday (FedEx Ground CA to TN). Setup was easy except there were no solar cables included, only a 6 foot cigarette plug to XT60 cable, but I developed a work around. The other two cables were a 110 volt power cord and a Power Station to Extra Battery cable. There was also a 12 volt to 12 volt cable. Each unit weighed about 50 pounds, and stacking them was easy. Both batteries arrived charged to 30 percent. The interconnecting cable between the Power Station and Extra Battery can only be plugged in one way, so as long as Port 1 is used for the first battery to Port 1 on the Power Station all is good. I used a furniture moving dolly to set my units on so I could move them easily. Next, I chose solar power for my first test using the cigarette lighter plug, and it worked! Then I plugged the 110 volt cable into an outlet and both batteries began to charge. In approximately 2 plus hours I was at 100 percent on both batteries. Now came the first big test, the refrigerator. I was pleasantly surprised, the discharge rate began at 345 watts and soon dropped to 78 watts, no problem whatsoever! So Friday and Saturday was spent learning about the system, the app, and it’s capabilities. My refrigerator was connected throughout and some other small devices were tested as well. Again, no problems! Little did I know on Sunday, the third day, my EcoFlow system would REALLY be tested! A major wind storm hit our city with 70 to 80 mile an hour winds for about 10 minutes. Power lines were downed, trees were uprooted, and the internet was knocked out as well. Between the power and internet outages we were down for about two days. I couldn’t believe the Delta 2 Max system had arrived at the perfect time. During the power outage we heard the noise from several of our neighbor’s gas generators running all night, but at our house ALL WAS QUIET! because we were powering 2 full size refrigerators and a full size freezer with our EcoFlow system. The next morning the batteries were discharged to about 50 percent on our Delta 2 Max. We connected our gas generator and ran it for about an hour and twenty minutes to charge our batteries back up to 100% and then shut it down. It was very impressive to see the Delta 2 Max easily charging at 1.5 Kilowatts from our gas generator. Wow, so using the Delta 2 Max intermittently with a gas generator the system stays charged and ready to provide power as needed and saves the cost and maintenance of operating a gas generator 24/7, and minimizes loud noise all at the same time. One tip we have learned about solar panel connections to the Delta 2 Max to obtain the best charge is to use a series and parallel setup when using 100 watt panels. The first two 100 watt panels connected in series provides us about 40 volts @ 5 amps (200 watts). The next two panels are connected the same way and connected to the first two panels in parallel. These 4 panels pass through one twin lead cable (you provide) to feed one of the two solar input XT60 connectors. The other XT 60 Solar Input is setup the same way. Be careful not to exceed the 60 volt maximum input voltage per input to the system. I understand in the US there are tax rebate incentives to buy systems and solar panels for your home such as the EcoFlow. I’ve read of a 30% rebate, but check that out for yourself. I could talk about the USB ports, 12 volt Jack, multiple 110 volt outlets, and app features, but you can get that info from other reviews. There are many reasons to own one these EcoFlow systems if the price is not an obstacle for you. But, from what I’ve seen this past week I am very glad we chose to buy. We highly recommend the Delta 2 Max Power Station and Extra Battery (or 2) for your Plan B scenarios. Oh no, our power just went out again… I’ll have to update later… UPDATE - It has now been over 6 weeks since receiving my Delta 2 Max Power Station and Extra Battery and I would love to say it has been a wonderful experience, but unfortunately that is not the case. After 2 good weeks of operation I started seeing a flashing battery indicator, a red OVERLOAD indicator, and a flashing 60 Hz indicator. At the same time the D2M was shutting off my load (a single refrigerator) and after a few seconds switching it back on again, this happened every few minutes. I contacted Customer Tech Support and after waiting around 30 to 40 minutes for someone to answer the phone, someone finally did. My problem seemed to puzzle them, they asked me to send them a video of what I saw. I did. This simple contact turned into a a 2 week ordeal where they were not quick to get back to me. They eventually did respond and told me I needed to ship both units back to them, and that I would then receive new replacement equipment from them. I immediately shipped my D2M & EB back to them, also forwarded the Tracking info, and requested my new equipment be shipped to me asap. It has now been over 4 weeks dealing with their customer support and what I’ve experienced is extremely slow to no response most of this time. As of today EcoFlow has my full payment for my equipment, they also have both of my units, they no longer respond to my emails, and the last contact I had they said it would probably be at least 2 weeks before I should expect them to get back to me. This is such a disappointing interaction. I want to believe EcoFlow has good dependable equipment, but I’m starting to wonder if I made the best choice. This review is not meant to disparage the company. This is just my personal experience with their Customer Tech Support and equipment. When and if the situation changes I will provide another update. —————————————— UPDATE - After requesting a refund of my equipment purchase, I was told my D2M & EB were already shipped from their warehouse. And in all fairness to EcoFlow the FedEx tracking website confirmed that in fact that was true, 2 packages shipped the day before my request. But why EcoFlow Customer Service did not alert me to let me know to expect them, … that would have avoided so much friction and poor customer relations. What I did not know at that time was, if it would be new or used replacements? I’m happy to say the units appear to be new, and one day into operation all seems to be well. As of today it’s been a little bumpy getting here, but I’m optimistic that moving forward we will be prepared for the next power outage. As long as the equipment continues to operate as designed we will be good. I hope the EcoFlow team will strive to improve their Customer Service team’s communication skills to achieve customer satisfaction. —————————————————————- UPDATE 4 MONTHS LATER - Our Delta 2 Max and Extra Battery are doing a good job powering our refrigeration units mostly from our 2- 415 watt (830 watts total) of solar power. On a daily basis typically we charge from an AC wall outlet for about a hour and a half to top off our charge before bedtime, unless it’s overcast that day and we have to charge a little more. One of the important lessons we have learned is the D2M CANNOT be left plugged into the wall AC all of the time because the load will intermittently get turned off. We assume this probably is a heat related/safety shutoff feature. To avoid random shutoffs we typically limit our AC wall power charging to no more than a hour to hour and a half at a time, but the solar inputs always function as expected. So, … we are now once again happy with our EcoFlow System and hope the EcoFlow customer support team service has improved. We look forward to additional features and better tech support in the future.
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Reviewed in the United States on June 30, 2023 Reviewed in the United States on June 30, 2023 by Joe Video
Style: DELTA 2 Max+Extra Battery
Excelente
Reviewed in the United States on May 13, 2026 by Yudaimi Martinez
Style: DELTA 2 Max+Extra Battery
Excelente producto lo estoy usando en Cuba y hasta ahora cumple con todas las expectativas
Reviewed in the United States on March 24, 2026 by Angel