EcoFlow Delta Pro 3 Long-Term Review

Last Updated on: 25th July 2025, 03:47 am

Last year, EcoFlow reached out to me to see if I’d be interested in testing the new Delta Pro 3 power station. I had plans to set up an all-electric RV, and knew that I’d need about as much energy storage as possible, so I accepted their offer (full disclosure, they sent the unit and accessories mentioned in this article for me to keep).

My Testing

Sadly, my RV plans didn’t pan out nearly as fast I had hoped. So, for the first several months, I ended up using the Delta Pro 3 around the house. One of the circuits in my home had too many things on it, largely because the house wasn’t built with refrigerated air in mind. So, we used the power station to power my photo and video editing rig, which is a real power hog. In this role, it performed flawlessly. We’d charge in somewhere else in the house that had spare capacity, and then run the power station into the room the computer was in when we needed it.

Later in the year, I finally got a travel trailer. Unfortunately, I couldn’t get the small Aliner camper and tow it with my Chevy Bolt, and ended up temporarily going back to gas for towing for now. Plus, my family wanted a much larger camper, which meant energy needs for AC and heat pump were going to go up, which meant I needed an expansion battery.

I ended up doing a semi-permanent installation of the power station in my travel trailer. This required rerouting the 3o-amp wiring to the space under the main bed, and then back out to the cord so I’d still be able to plug in normally at RV parks. Under the bed, I installed a 30-amp outlet and a 30-amp plug, which makes it possible to bypass the power station entirely while at RV parks with hookups. But, when off-grid, it’s possible to power everything, including two new circuits for an electric oven and induction range, off the battery.

To be more efficient, I also bypassed the trailer’s 12-volt power converter (the thing that converts 120 volt AC power to 12 volt DC power when the camper is plugged in), which would use about 40 watts just at idle. The Delta Pro 3 has a DC output which I was able to wire directly into the battery terminals on the trailer tongue. Problem solved.

Then, I added a 12 volt computer fan on the front of the bed to make sure the unit always gets fresh air, along with a soffit vent on the side near the back of the unit for heat to go out. This greatly helped keep the battery temperatures in a good range and keep the unit from having any major problems or heat shutdowns (something I didn’t experience even before the fan).

The Good

With the testing story/methodology out of the way, let’s talk about what EcoFlow did right.

First off, I’ve had no problem pulling even more than the unit’s rated power output. During one stop for dinner at the Ozark Rest Area on I-40 in Arkansas, we decided to cook a frozen dinner. This required running the microwave to defrost the lasagna at the same time as heating up the little electric toaster oven. It was hot out, so we also ran the air conditioning. All together, at least when the oven’s heating element was on, this pulled about 4000 watts without a hitch.

The unit has also been versatile enough to handle nearly all power needs while camping. The second battery, which doubles capacity to a whopping 8 kWh of storage, makes it possible to run an older, not very efficient air conditioner for about 9 hours on hot summer nights. This means that boondocking in the heat wasn’t a problem.

Getting the battery full before bed isn’t a problem either. I currently have 1800 watts of solar (the camper has solar all over the roof and front), which means real world power input has been around 1200-1500 watts in most places during peak hours. The unit also has the ability to work with EcoFlow’s smart generators, which can quickly add a little extra power before bed and help top it up in the morning for breakfast. But I used that very little, only needing about 20 hours of generator time in almost a month of camping.

All in all, I’ve depended on the Delta Pro 3 and extra battery for about 5 weeks this year, and it hasn’t left me unable to power the things I wanted to power.

The Mildly Bad

An important thing to keep in mind about power stations from any manufacturer is that they’re computers. Like any computer, sometimes you have to “turn it off and back on again” to get past errors. In 5 weeks of camping, I’ve had to do this three times.

The first two times, my Delta Pro 3 started warning me about electrical shorts and shutting off electrical output. This was obviously great cause for concern, as I’m a little picky and don’t like the idea of my camper burning down. But, I inspected all of the wiring and found no shorts. Plus, electrical shorts don’t tend to just appear without something damaging the wires. This left me a little baffled and did leave me without power for a few minutes.

But, when I searched online, I found out that the problem was with the Delta Pro 3. Reddit users reported that disconnecting any input power (including solar), shutting the unit off, and holding the power button for ten seconds would reset the BMS and power computer. In both cases, doing this put everything back to normal.

The other error I experienced was with cell balancing when sleeping in the Bass Pro Shops Pyramid parking lot. About half way through the night, the AC shut off and the unit beeped. When I logged into the app, I saw that the power station had depleted itself completely while not taking any power from the second battery pack. A quick reset of both the battery and the power station made everything work again, and we used the power in the second battery to stay cool until morning (Nashville is HOT in June and July, especially with all that humidity!).

The key takeaway here: you should know how to reset ANY power station you own, because I’ve seen all brands do this kind of stuff. It’s also a good idea to keep power station firmwares up to date, as many gremlins are removed that way. After an update, I haven’t seen the electrical shorts error again, but I’ll have to see if it’s been permanently fixed or not.

The only thing I wish the station would do is send out a push notification if it’s shutting the power off to give you an opportunity to go reset it.

The Ugly

I only have one major complaint about the Delta Pro 3: its handling of pass-through AC power.

When I was first renovating and electrifying the camper, I plugged the Delta Pro 3 into AC power and powered my air conditioner. Once the camper got down to the set temperature inside, the AC compressor would shut off. Then, when the compressor would kick on again, a momentary power draw of over 2,000 watts would happen before settling in at about 1200-1300 watts. This would often cause the unit to beep and shut off the power.

When not plugged into shore power, the unit can handle the momentary high load of the AC compressor kicking in just fine. As I’ve also seen, running as much as 4 kW off grid wasn’t a problem.

What I figured out in further testing and experimentation was that the unit limits overall power output to about 1800 watts when it’s plugged into the grid. Setting lower input levels didn’t help, as it would pass-through whatever you’re using plus the amount of power you tell it can be used for charging. In other words, power input and output don’t operate independently when the unit’s pulling in AC power.

I was able to get around this problem by bypassing the power station at RV parks, using the plug and receptacle setup I described earlier in this article. I’d usually set it to take in 800 watts from the 20-amp receptacle, and still have plenty of power on a 3o-amp connection for the microwave, fridge, and AC.

Some people have gotten around this by purchasing an AC-DC power supply and feeding power into a Delta Pro 3 via one of the solar charging ports. While this will work (assuming you provide voltage and amperage within spec for the input), I’m already using both DC input ports for solar. So, for now at least, I’m going to need to continue bypassing the power station when the camper is plugged in.

Final Thoughts

Despite the one bad thing (pass-through power limits) and the minor annoyance of needing to reset the power station on occasion, I’d still recommend the Delta Pro 3 for most buyers. About the only application I’d avoid using them for is critical, unattended power backup. If you can’t be there or nearby to reset the power station, don’t stake anybody’s life (like a pet in a camper in a hot place, for example) on it running correctly.

Other than that, it’s a pretty decent power station that should serve about anybody well in camping, RVing, or for power backup purposes.