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Customer reviews for 3400-Watt EcoFlow DELTA 2 Max Portable Power Station With X Boost Technology + 2 pcs 110W Solar Panel for
3400-Watt EcoFlow DELTA 2 Max Portable Power Station With X Boost Technology + 2 pcs 110W Solar Panel
4.8 out of 5 stars
stars182 ratings181 reviews
  1. 5 stars85% (154)
  2. 4 stars12% (22)
  3. 3 stars1% (2)
  4. 2 stars0% (0)
  5. 1 star2% (4)

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Showing 1-10 of 181 reviews
Sep 23, 2025
Michael J
5 out of 5 stars review

Verified Purchase

Medical Equipment Needs This Backup

Perfect emergency backup for my wife's oxygen concentrator. Utility power failed 4 times in one day, scrambling to switch to a oxygen cylinder each time. Never have to rely on the power grid plus it can recharge with the included solar panels.

Helpful?57N1YK4LERJM13661605668
Dec 17, 2023
Tony G
5 out of 5 stars review

Verified Purchase

Great back up

This ecoflow is clean and quiet and works great. I have a EcoFlow 2400-Watt Portable Power Station. I really like the app for my phone where I can monitor the input and out put in real time. Regarding the value - it could be a little less expensive.

Review from ecoflow
Helpful?57N1YK4LERJM13661605668
Nov 22, 2023
cl01
5 out of 5 stars review

Verified Purchase

Works great, easy to store and move around

I bought this when it was on sale to have when camping to charge a Delta 2. It is very easy to setup, and worked great the one time so far so have tested it. It packs away to a nice size when I don’t need it. Charging speed was pretty quick, so even though it’s not a high wattage panel, it looks like it’s going to do just what I need.

Review from ecoflow
Helpful?57N1YK4LERJM13661605668
Jul 7, 2023
Andy A.
5 out of 5 stars review

Verified Purchase

Solar Generator In, Gas/Propane Generator Out!

We have been checking out our new Delta 2 Max with add-on battery and solar panels for several days now. Very impressed with the functionality of the overall system and app. The capacity is great to get us through power outages running necessary loads sans A/C. Our gas/propane generator will now become backup to the solar backup. Hopefully, we won't have to use the loud, smelly machine in the future.

Review from ecoflow
Helpful?57N1YK4LERJM13661605668
Jul 30, 2024
MotoRandy
5 out of 5 stars review

Verified Purchase

Sure beats the other solutions

I used solar panels, charge controllers, AGM batteries, and inverters for YEARS when I built out another camper. I was always searching for direct sun to 'refill' my batteries. I was such a pain—a real distraction to my travels. Now, I use an Ecoflow battery generator and their 800-watt charger. Today, I installed the charger. It was very easy compared to all the old components. So, I only need to take a short drive to charge my battery generator fully. My battery generator and charger are both connected to Ecoflow's app. I can watch the progress of charging and discharging. The app is very professional and provides way more information than I need. But it's nice. The battery generator eliminates the need for solar panels, a charge controller, and an inverter. The batteries in the generator are much better quality than the old AGM batteries. I'm so happy to have made the switch. I would recommend their products 100%; I was lucky to have purchased them during Prime Days and saved a considerable amount. They provide quality products. I'm a happy camper without thinking about the charge of my batteries. Life is good.

Review from ecoflow
Helpful?57N1YK4LERJM13661605668
Nov 17, 2023
MadMouse
4 out of 5 stars review

Verified Purchase

So far so good, with one problem

I bought this and installed it into my daughter's bus. (Schoolie conversion) It is what we wanted. The only complaint that I have is the way the cable comes out the side. you cannot stack anything next to them within a foot. The wave has a nice 90 degree cable that goes between the battery and AC but the Delta 2's cable sticks about 6 inches out the side.

Review from ecoflow
Helpful?57N1YK4LERJM13661605668
Sep 30, 2024
Sparky911
4 out of 5 stars review

Verified Purchase

Portable charging power for small stations.

Light/portable. Set up is a little wonky. Could use some better instructions. In full light and the correct angle, output was right around 100w. This panel would be great for temporary charging of a small EF station (River or Delta), and has MC4 connectors plus an mc4 to x60 adapter.

Review from ecoflow
Helpful?57N1YK4LERJM13661605668
Aug 11, 2024
Doug2
3 out of 5 stars review

Verified Purchase

Excessive standby power consumption

The standby power consumption is very disappointing. Just having the DC on with no load apparently takes 10w! Otherwise I like the product.

Review from ecoflow
Helpful?57N1YK4LERJM13661605668
May 18, 2026
michele
3 out of 5 stars review

NO Solar panels

came without the solar panels. kind of defeats the purpose of using battery power if i have to charge it with house power. They're supposed to be sending me the solar panels apparently they're in process. If they don't come, or don't work well, ill be returning the battery pack.

Helpful?57N1YK4LERJM13661605668
reply from Ecoflow Team

We're sorry for the inconvenience you've experienced. Please reach out to us at support@ecoflow.com or call us at +1 (800) 368-8604, Monday to Friday, 9 a.m. to 7 p.m. (EST). We're here to help and will do our best to resolve your issue quickly.

May 1, 2026
anonymous
1 out of 5 stars review

No power station-panels only

Only received the 2 solar panels; POWER STATION WAS NOT DELIVERED!! called customer service %26 received an AI bot that ordered a replacement. Then I received an email with instructions to return the item I did not receive!! Called customer service again %26 was finally connected to real person but call was disconnected after 30 minutes. called customer service a 3rd time %26 finally got connected to another real person who immediately put me on hold so he could "read my call log", %26 took my number in case we got disconnected; assured me he would call me back if that happened. After 24 minutes, my 3rd call was disconnected. Almost 5 hours later I'm still waiting for that call back. Sam's customer service is a joke.

Helpful?57N1YK4LERJM13661605668
reply from Ecoflow Team

We&#39;re sorry for the inconvenience you&#39;ve experienced. Please reach out to us at support&#64;ecoflow.com or call us at &#43;1 (800) 368-8604, Monday to Friday, 9 a.m. to 7 p.m. (EST). We&#39;re here to help and will do our best to resolve your issue quickly.<br /><br />To better assist you, please email us at support&#64;ecoflow.com or call us at &#43;1 (800) 368-8604, Monday to Friday, 9 a.m. – 7 p.m. (EST).