Tech review: More power? EcoFlow Delta Pro 3 can deliver

Jim Rossman, Tribune News Service on

Published in Business News

As I write this, Hurricane Beryl is in the Gulf of Mexico, churning toward the Texas coast.

My mom lives outside Houston, and we were down for a visit yesterday. We ended our visit about five minutes before the first rain bands moved in.

I drove home to Dallas not too worried about our power going out, but I left mom with a fully charged portable power station to keep some things powered on like lights and her coffee maker.

I’ve reviewed quite a few portable power stations, and this week we are looking at the newest offering from EcoFlow, the Delta Pro 3 ($3,699,

Its big

The Delta Pro 3 is on the large side – weighing in at just over 114 pounds.

I would describe it as ‘barely’ portable. It does have two sturdy wheels and a telescoping handle like a suitcase, so it is not impossible to move around, just cumbersome.

Let’s dive into what the Delta Pro 3 is all about.

What is it?

The Delta Pro 3 is a large rechargeable battery with a capacity of 4,096 Watt hours. It uses Lithium Iron Phosphate (LFP) batteries that can be recharged more than 4,000 times before their capacity drops to 80 percent.

It also has outlets for you to power your stuff. The inverter behind those plugs can output 4,000 Watts. How long the battery lasts depends on what you are plugging into it.

Simple electrical math tells us if you plug in enough stuff to draw the full 4,000 Watts, the Delta Pro 3 will run out of juice in about an hour.

In a more realistic use, the Delta Pro 3 can power an appliance like a full-size refrigerator for about three days. It can run a CPAP machine for more than 40 hours. The inverter can handle just about anything you can plug into it.

I’ve written about power stations and lamented about what they couldn’t do, but in this case, I haven’t found anything the Delta Pro 3 couldn’t do. It worked with everything I plugged in to test.

The Delta Pro 3 has 120v AC outlets, and 240v outlets including the ability to run split phase 240v appliances. There are also two USB-A and two USB-C outputs.

Suffice to say the Delta Pro 3 can power all your stuff, including your clothes dryer, a well pump and your central air conditioner, if you have the right kind of connection.

Whole house

The Delta Pro 3 is also designed to tie into your home’s electrical system to provide power to your entire house.

EcoFlow offers expansion batteries (also with 4,096Wh of power) for the Delta Pro 3 ($2,599). You can attach two expansion batteries to the Delta Pro 3 for a total capacity of 12kWh.

You can connect up to three Delta Pro 3 systems together for a maximum capacity of 36kWh of power for your home. Combining multiple Delta Pro 3s also means you combine the inverter power to a massive 12,000W.

EcoFlow offers several ways to connect the Delta Pro 3 to your home’s electrical system, including an inlet box, transfer switch and a smart home panel.

The Delta Pro 3 can also act as a UPS (uninterruptible power supply) so if you have a computer (or anything else) connected to it, it will automatically keep it running if the power goes out.



So, it has a lot of power and different ways to use that power – how do you recharge it?

EcoFlow says there are seven ways to power the Delta Pro 3 including options to charge it from zero to 80% charge in just 50 minutes.

Charging can be done from a wall outlet or solar panels, but you can also charge it up from a 12v car outlet or even take it to an EV charging station.

EcoFlow also sells a gasoline-powered smart generator that can keep the Delta Pro 3 charged up. The generator and Delta Pro 3 talk to each other and the generator motor automatically starts and stops as needed to keep the battery charged up.

You can combine different recharging methods, like AC power and solar panels, for faster charging. The Delta Pro 3 can handle up to 7,000W of charge input.

The Delta Pro 3 has two solar inputs, the high-voltage input can handle 30-150V/15A up to 1,600W, while the low-voltage input can handle 11-60V/20A up to 1,000W. So you can combine solar panels for up to 2,600W of input.

One thing to mention is the included cables. The Delta Pro 3 ships with only its AC power cable. There are no 12v DC or solar panel cables in the box. Those cables will come when you buy the solar panels or other accessories. Some people may not be happy about that, but I don’t mind EcoFlow not including cables I may never use.


The EcoFlow app for your phone will let you control every aspect of the Delta Pro 3 and see exactly what’s happening with all the inputs and outputs and make any necessary changes to the system.


The Delta Pro 3 is a serious system. This isn’t the one you want to toss in the trunk to go camping, but it can certainly do that, if you have some help lifting it into your vehicle.

This is the system you want next to your fuse box, ready to go when the next hurricane hits and your power goes out.

This is the one you want to wheel into your kitchen and plug your refrigerator into to keep your expensive groceries from going bad.

This isn’t an inexpensive system.

I’ve listed retail pricing above but check the EcoFlow website for launch specials. As of July 8, a Delta Pro 3 and two expansion batteries will set you back $7,999. Add in an EcoFlow Smart Generator 4000 ($1,799), and this is a system that can keep your home powered up during even the longest emergency.

There is so much more to learn about power stations and the Delta Pro 3. One of my favorite sources of information is a YouTuber who goes by Professor Hobo, and his channel is called HOBOTECH. Check him out to expand your power station knowledge. He has a great half-hour video on the Delta Pro 3.

Oh, and while I was writing this, mom texted that her power came back on after about six hours.



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