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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
4.7 out of 5 stars
stars
187 ratings186 reviews
  1. 5 stars84% (157)
  2. 4 stars12% (23)
  3. 3 stars1% (2)
  4. 2 stars0% (0)
  5. 1 star3% (5)

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Showing 1-10 of 186 reviews
Sep 23, 2025
Reviewer name: Michael J
5 out of 5 stars
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
Oct 4, 2026
Reviewer name: Kennyb
5 out of 5 stars
5 out of 5 stars review

Delta two max runs everything I needed to in my l

Two I have two of them now just bought the second one couple months back is it every day in my little shop down in storage it powers, air compressor powers all the lights other electrical tools. I have no problem with it last for a couple of days at least very good. The one that I purchased two years back has blown a capacitor and stuff and I'm trying to find out how to get that worked on or repaired

Review from ecoflow
Helpful?57N1YK4LERJM13661605668
Jun 14, 2026
Reviewer name: campingKev
5 out of 5 stars
5 out of 5 stars review

Extreme power with every possibility

This is my second unit, the first one I gave to my son in need. I have been using to power our 35' while charging through EcoFlow 90 alternator generator connected to 2 Battleborn LIFe4 batteries charging with 800 watt solar panels in pass through mode. Loving the freedom to travel on our own power.

Review from ecoflow
Helpful?57N1YK4LERJM13661605668
Sep 10, 2024
Reviewer name: ObeyThePug
5 out of 5 stars
5 out of 5 stars review

Excellent!

I own 6 of these panels now. The are the most cost effective way to use solar to charge the River series and the Delta 2 and Delta 2 Max. by combining two or more you can get close to max charging on the aforementioned products. they are small and lightweight and, for me at least, setup is quick and easy. I just lay them on any flat surface, including the ground, and they just work! I have gotten 95 watts out of mine, but I am at a low latitude. Your mileage will vary! If you shop the Ecoflow sales and/or use ecocredits these are the cheapest way to power your systems.They are also just as easy to take down. I highly recommend these panels.

Review from ecoflow
Helpful?57N1YK4LERJM13661605668
Oct 23, 2026
Reviewer name: ChuckD64
4 out of 5 stars
4 out of 5 stars review

Overall Great

I've had mine for almost two years, but only needed to use it for the first time about a week ago. I was without power for about 12 hours. The only thing that really surprised me was how much power it used to make one pot of coffee. I started at 99%, and by the time the pot was finished, it was down to 79%. Beyond that, it kept my lamps and tv going for the rest of the day and didn't use much power. I will most likely invest in a solar panel just in case.

Review from ecoflow
Helpful?57N1YK4LERJM13661605668
Aug 11, 2024
Reviewer name: Doug2
3 out of 5 stars
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 1, 2026
Reviewer name: anonymous
1 out of 5 stars
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'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. To better assist you, please email us at support@ecoflow.com or call us at +1 (800) 368-8604, Monday to Friday, 9 a.m. – 7 p.m. (EST).

Jun 7, 2026
Reviewer name: anonymous
1 out of 5 stars
1 out of 5 stars review

Missing solar panels

I’m missing my solar panel…

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.

Apr 14, 2026
Reviewer name: WJT
1 out of 5 stars
1 out of 5 stars review

Buyer Beware - Did not Receive Machine just Panels

We ordered two of these but did not receive the machines, only the solar panels. Our account shows “delivered”. How do we get the machines? They were supposed to be delivered today. We've filed a complaint but have heard nothing. I have pics of the four panels on our front porch and no machines but it won't let me upload it! We live in a gated community, and have Ring Doorbell. The video from Ring shows only the solar panels being delivered! We want the machines or all our money back!

Helpful?57N1YK4LERJM13661605668
May 3, 2026
Reviewer name: anonymous
1 out of 5 stars
1 out of 5 stars review

DISAPPOINTED

Only received the solar panels - not the Power Station. When I called to inquire where the power station was, I was sadly informed the item is out of stock and there was nothing that could be done. The solar panels are useless without the power station. I ask for a different power station and was told that could not be accommodated since it's a different item number. I was told to wait and if it is ever restocked and then reorder. However I purchased the system with an instant savings of $470 off, so now the price would be much higher. I was super super excited, yet am completely devastated that Sam's Club oversold an item that they do not have, marked my order as complete but only sent me useless solar panels, and offered no resolution for me to have power station.

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. To better assist you, please email us at support@ecoflow.com or call us at +1 (800) 368-8604, Monday to Friday, 9 a.m. – 7 p.m. (EST).