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EcoFlow Delta 2 power station review: Flexible, advanced, and LOUD. Ecoflow not charging

EcoFlow Delta 2 power station review: Flexible, advanced, and LOUD. Ecoflow not charging

    EcoFlow DELTA mini Portable Power Station Review

    The EcoFlow DELTA mini is a 1400W Portable Power Station that has the ability to fast-charge with rates up to 900W, as well as charge and supply power at the same time. Paired with up to 300W of solar panels, it can operate demanding loads off grid, or top off quickly from AC power no matter the situation. With an 882Wh battery, the DELTA mini is anything but, putting it into a market segment few can compete against it.

    ecoflow, delta, power, station, review

    The EcoFlow DELTA mini is a 1400W Portable Power Station that has the ability to fast-charge with rates up to 900W, as well as charge and supply power at the same time. Paired with up to 300W of solar panels, it can operate demanding loads off grid, or top off quickly from AC power no matter the situation. With an 882Wh battery, the DELTA mini is anything but, putting it into a market segment few can compete against it.

    The Portable Power Station market has seen plenty of entries over the past few years, each looking to cover different segments of the market. These use cases generally include off-grid, emergency backup or camping, all areas where a power outlet is needed but source may not be available. Beyond a large inverter or a big internal battery, many of these units try to set themselves apart from the pack through cost or features. Charging capabilities are a huge differentiator, where AC input is most common, followed by car power and solar.

    EcoFlow DELTA mini

    The EcoFlow DELTA mini is a 1400W Portable Power Station with a battery capacity of 882Wh. It supports peak power draws up to 2100W, and also has an X-boost mode for certain power-hungry devices that are less sensitive to power quality that increases the 1400W capabilities up to 1800W. This puts its power capabilities closer to that of a gas generator than most rechargeable systems on the market.

    Another key aspect of the DELTA mini is its ability to charge at up to 900 watts when connected to AC power, which allows it to fully charge in under 2 hours. This might not seem like much, but some models can take most of a day to charge with much smaller external power supplies. The DELTA mini can also support power while operating, giving it UPS capabilities or keeping devices running while your car or solar panels are adding juice back into the battery. If you are running equipment and low on power, you don’t need to turn things off to charge the battery.

    Out of the box, the EcoFlow DELTA mini comes out as a very slick and fully integrated power solution. It has a very well-made case with a study feel. Minimal plastic creaking when you move it around and it also has integrated rubber pads on the bottom of the case to give it a solid footing. Design can go a long way and EcoFlow really went all out, building the DELTA mini with a premium look and feel.

    The front of the DELTA mini has a bright and easy-to-read display, giving you a concentrated view of the inner workings of the Power Station. Left to right with a quick glance you can view runtime remaining, charge percentage of the battery, incoming and outgoing power usage as well as some other indicators showing you which ports or features are active.

    The continuously updated runtime indicator is very useful, giving you real-time feedback on how loads are affecting the battery. Battery capacity gives you the vital stat of how charged the system is, and then incoming and ongoing power let you track usable and charging capabilities.

    There are only two buttons on the front of the case, a big yellow on/off button as well as an IoT reset button. On and off is pretty obvious, while the IoT button allows you to configure remote access. The DELTA mini has a feature-rich app that really makes it stand out from other models on the market, which we will get into shortly. Finally, the front includes a USB-C port, two USB A ports and a fast-charge USB-A port.

    On the back of the sides of the DELTA mini are fan vents, which are used for the Power Stations’ thermal management. These kick on dynamically during heavier power draws, as well as during the fast charging modes. They quickly spin down as demands decrease, so there are many times when the fans are perfectly silent.

    On the back are the main charging inputs as well as the higher-watt DC outputs. On the top, there is a little pop-up cover to hide the inputs during deployments. Under the cover is a DC jack for car or solar charging, a charge-rate selection switch, an AC input plug and a circuit breaker. With most Power Stations on the market including an external power adapter, the fully integrated power supply is a really nice touch. It makes sense though as many of these power adapters get very warm during charging. The 900W charge mode leverages the internal fans to keep both the battery and that integrated power cool.

    From a port layout, EcoFlow gives the DELTA mini 5 120V AC outlets, four of which have a cutout to allow three-prong devices to operate ungrounded. It also has a covered car power jack and two DC ports. Both AC and DC output segments can be switched on or off separately, while the USB ports on the front are always on.

    EcoFlow DELTA mini App Remote Management

    EcoFlow offers extensive remote management capabilities for their compatible devices, spanning from RIVER and DELTA series Power Stations to Smart Home Panels and Smart Generators. The app provides a centralized way to monitor and control your device, no matter if you are 5 feet from it or miles away. It does that through its own Wi-Fi hotspot or connecting to a known wireless network in range. From that, it interfaces locally or remotely through EcoFlow’s Cloud platform.

    The EcoFlow app is pretty straightforward, with both iOS and Android versions. Once you register an account with EcoFlow you hit a screen allowing you to add in different EcoFlow models you have. Clicking the “” symbol brings you to a screen to add in different models in their portfolio, with instructions then given on how to connect them. For the DELTA mini, you press the IoT reset button on the front of the device and then connect to the EcoFlow Wi-Fi network it stands up. Once connected, you can then interface with the Power Station.

    The remote interface shown for the DELTA mini is very intuitive and continues the trend where EcoFlow put a lot of thought into each design element. The landing page shows the main vitals of the Power Station, with an overlay on top of the model’s rendering showing you the current capacity.

    At the top, you see the operating temperature of the device, estimated runtime and current battery capacity. The next section splits into two parts covering input and output. Output is the default view, showing you a real-time view of the watts consumed across the AC, 12V DC and USB ports on the mini. Both the AC and DC parts can be remotely switched through the app, allowing you to disconnect loads even if you aren’t standing next to it. You can also manually enable X-Boost mode for higher AC loads (although not as compatible with all devices).

    The input side is more basic but focuses on the power supplied by either DC sources (Solar and automotive) or AC. They also give a real-time moving chart of the current incoming or outgoing load, although it starts from scratch if you switch views or exit and re-enter the app view. A historical view would be nice, although honestly, it’s still impressive to have this much monitoring presented from the system regardless.

    The settings area is equally impressive, opening more functionality that will be appreciated by those using the DELTA mini on a more regular basis. For increasing longevity, or just not wanting to deplete the unit out in the field, EcoFlow lets you set the discharge and charge percentage levels. By default, this is 0 to 100%, but you can tighten that up to narrow the charge cycles for increased battery longevity. Bumping up the discharge from 0% also lets you set a built-in reserve.

    Next are the AC and DC charge settings. While the physical switch on the back of the unit lets you change between the default 200W and 900W fast charge modes, if you keep the switch set to the 200W mode, you can adjust the peak charge rate to a custom level inside the app. You can adjust it from 200 to 900W in 100W increments, which is useful if you want to balance loads from the Power Station versus other devices on the circuit. An example might be fast charging multiple DELTA mini’s on the same circuit, without worrying about tripping the breaker. You are also given a similar setting for the car input, which is adjustable from 4A to 8A also in 1A increments.

    The app also gives you traditional customization options like disabling the beeps during mode switching, unit and screen timeout, as well as AC plug timeout. For a remote excursion, you might not want the AC ports staying on if you accidentally forget to switch them off. For a home office UPS use case though you would want to leave the AC ports on always. You can also view and update firmware through the app, which is handy to keep things current in terms of lifecycle management.

    Finally, EcoFlow gives you a Specifications view, which is quite useful. Not everyone memorizes the capabilities of their electrical equipment, so having a reference guide can come in handy. Here you can find all the details for the DELTA mini, and probably similar views for other models in their portfolio. Highlights include the serial number for support, rated capacity, device weight, storage and operating temperature ranges, and all of the input/output ratings. Being able to cross-reference the output capabilities without needing to break out the instruction manual in the field could be invaluable to some.

    EcoFlow DETLA mini Specifications

    • Pure Sine Wave AC Output( ×5): 1400W total (Surge 2100W)
    • Max Device(s) Power Supported by X-Boost: 1800W
    • USB-A Output( ×2): 5V, 2.4A, 12W Max
    • USB-A Fast Charge(×1):5V, 2.4A / 9V, 2A / 12V, 1.5A, 18W Max
    • USB-C Output(×1): 5/9/12/15/20V, 5A, 100W Max
    • Car Power Output(×1): 12.6V, 10A, 126W Max
    • DC5521(×2): 12.6V, 3A
    • AC Charging: 900W
    • Solar Charging: 300W Max, 11-75Vdc, 10A
    • Car Charging: Supports 12V/24V Battery, Default 8A
    • Battery Chemistry: NCM Li-ion
    • Cycle Life: 800 cycles to 80% capacity
    • Shelf Life: 1 year
    • AC Wall Outlet: 1.6 hrs (900W)
    • Car Charger: 9.5hrs (96W)
    • 110W Solar
    • 1 Set: 10-20 hrs
    • 2 Sets: 5-10 hrs
    • 3 Sets: 3.3-6.6 hrs
    • 1 Set: 7.5-15 hrs
    • 2 Sets: 3.7-7.4 hrs
    • 1 Set: 3-6 hrs
    • UL, CE, FCC, RoHS, TELEC

    EcoFlow 220W Bifacial Solar Panel

    EcoFlow also supplied their new 220W Bifacial solar panel with the DELTA mini, which has an interesting element to help drive more flexibility for a Portable Power Station. As the name implies, the design is Bifacial, which in simple terms means it can absorb light from both sides.

    The front side offers 100% of its 220W rating, the rear is rated for 155W. Now, this doesn’t mean you add both sides together for something greater than 220W, instead, the front absorbs the bulk of the power, and the rear when propped up captures some of what is reflected off the ground, a bit of a solar bonus.

    EcoFlow gives some examples of reflectivity of different surfaces and even claims if you set up mirrors behind the panel you can get up to 80% more power than you’d otherwise be able to capture. For real-world conditions most probably won’t be setting up mirrors, but it does go beyond what you’d normally find from a traditional solar panel.

    The manual also states that if the sun is overhead, you will still get the most power from laying the panel flat on the ground. The rear-side absorption is really from different parts of the day where the sun is coming in from steeper angles where you are trying to get every last watt of power into the battery.

    For reference, here’s the energy reflected off common surfaces:

    Both the EcoFlow Solar panel and DELTA mini are compatible with a wide range of other devices, there’s no platform lock-in here. You can connect the DELTA mini to most solar panels with MC4 outputs that fall within the supported voltage ranges and the solar panel has those same universal MC4 connectors that make it work with 3rd party Power Stations.

    During our use with the 220W Bifacial Solar Panel, we saw strong performance even during partly cloudy conditions. With a slightly overcast sky, we saw between 70 and 160W as clouds partially blocked the sun. On a bright day without overhead clouds, those rates jumped to 170-180W. The interesting element was tilting forward the solar panel off the ground though, increasing the power output by 10-20W.

    The strength of the DELTA mini paired with a high-performing solar panel is that you can charge the battery while also supplying power at the same time. During our testing, we leveraged this capability to keep the DELTA mini topped off while also providing power to a smaller 125W load over the AC inverter. The unit operated on a net-positive charge rate, where we were supplying our power and adding to the charge at the same time. Solar is a field with many variables, so actual results can differ. But it’s incredibly useful to keep operations going while charging the portable power station at the same time.

    EcoFlow DELTA mini Field Use

    Having power on tap in any situation is a valuable asset, which is why this Portable Power Station market is growing as fast as it is. The DELTA mini offers 1400W of power (2100W peak) under normal usage giving you a lot of power without compromises. To put this in comparison, most household devices are designed around a 1400-1500W peak limit to fit the 15A breaker size found in most homes and businesses. This puts the DELTA mini in the sweet spot of covering most items that can connect into a common plug, and many bigger draw items that don’t care about power quality when running in X-Boost 1800W mode.

    In an IT setting, having power on hand even for mobile devices is an important role. Many workstation-class notebooks draw power at a fast pace and running off its battery can have limits on CPU and GPU performance. Connecting to a power source for short to intermediate usage can help get the job done faster or keep systems going that would otherwise drain rapidly on internal batteries. Then pile on non-battery-powered accessory devices like networking switches, shared storage devices for collaboration, or even external monitors where an external AC power source becomes a requirement to keep things running.

    One example of the slightly larger DELTA being used in the field is from our resident Digital Imaging Technician, Vince Carnevale. He uses it to get workstations and monitor carts up and running while filming on-location before the electric department can provide generator power. Used in connection with a UPS, the DELTA provides a few hours of runtime, giving DITs and the cinematographer the ability to get to work right away.

    The UPS is still leveraged in this situation since the equipment they are operating has power-loss tolerances less than 30ms, which is the switchover time the DELTA series can react with. The UPS gives the sensitive equipment its needed buffer, while the EcoFlow DELTA offers the bulk power source for the cart. With the fast charge time, once power becomes available the DELTA is able to quickly recover its charge capacity to get ready for the next occurrence.

    In edge IT deployments standing up equipment for initial configuration may mean supplying your own power for a while. Here the DELTA mini can be leveraged to get servers operational for a period of time before you get them wired into their final production environment. We tested the DELTA mini with the 3-node Supermicro Edge IoT server, which had no problem standing it up in our lab.

    In the field you might need to power it up say inside your truck, and confirm settings are correct before finalizing your deployment. The mini wouldn’t be the permanent power source, but instead, one that gives you 30-60 minutes of runtime to perform specific tasks before the final installation.

    Final Thoughts

    In the Portable Power Station market, EcoFlow has shown some serious strength with the DELTA mini and their broader portfolio. It hits all the right buttons, covering a large capacity, powerful inverter, onboard fast charger, and an impressive remote management platform.

    While the mini is the smallest unit in the DELTA series, EcoFlow scales up to a huge ecosystem covering large power stations, solar panels, and associated equipment. For the smaller shop looking to stand up hardware in the field or the media professional getting ready for a shoot, EcoFlow has carved out a niche for themselves with the DELTA series.

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    EcoFlow Delta 2 power station review: Flexible, advanced, and LOUD

    At a glance

    Our Verdict

    You’d be hard pressed to find a more advanced and expandable portable power station than the EcoFlow Delta 2

    Best Today: EcoFlow Delta 2

    EcoFlow has long been recognized as one of the most technically advanced power station brands around, with one key weakness: battery chemistry. With the Delta 2, EcoFlow addresses that by moving to lithium iron phosphate cells, which more than triples the duty cycle of the battery.

    That’s likely to ease the minds of consumers who expect to heavily use their power stations.

    Note: This review is part of our ongoing roundup of the best portable power stations. Go there to learn about competing products, what to look for in a power station, and buying recommendations.

    EcoFlow Delta 2: The lithium iron phosphate difference

    To be honest, arguments over battery chemistry might be a little overstated. With the original 1,000WHr Delta, for example, it would take 800 full discharge cycles before the battery’s capacity would drop to 80 percent. That’s similar to what you would see in a laptop or phone, which you would actually charge and discharge daily or every other day.

    But most people are unlikely to give a portable power station that kind of a workout unless you’re permanently off the grid. Realistically, it’ll sit around until it’s used for a camping trip or occasional power outages.

    But going from 800 charge cycles to 3,000 thanks to the lithium iron phosphate chemistry is understandably very attractive to many people. In fact, with that many charges cycles, you might even consider using it as an ad-hoc UPS for your PC, keeping it plugged in full time.

    In truth, that would work with a laptop, but probably not a desktop. That’s because the Delta 2 takes 30 milliseconds to take over once power has been cut. On most desktops following the ATX specification, a PSU can go 16ms before power is lost to the system. The 30ms is simply too slow for most desktop PCs to not immediately reboot with the Delta 2.

    This doesn’t impact laptops, which have a battery to rely on while power is switched over. Similarly, fans, refrigerators, and most other household equipment doesn’t mind losing power for a fraction of a second. There’s no concern about losing data.

    EcoFlow Delta 2: Design and ports

    The Delta 2 doesn’t change much externally from the original model, with handles on both ends that are strong enough to lug around the 27 pound power station one-handed if you need to. EcoFlow has moved the AC and solar charging ports from the side of the unit to the back on the Delta 2. The solar ports continue to be based on the fairly common XT60 connector so you can connect aftermarket solar panels to it if you want. If you go this route, pay careful attention that the voltage of your solar panels remains below the Delta 2’s limit of 500 watts. Or stick with an EcoFlow-branded setup to be sure.

    We tested the Delta 2 with the company’s 220-watt bifacial panels and could push 140 watts to 150 watts from a low-angle fall sun. That was enough to offset our refrigerator’s power consumption of 172 watts, and yes, you can charge the Delta 2 while using it.

    Charging over solar is great, but cloudy days can make charging very tedious and nerve wracking if you’re worried you won’t have time to recharge before the sun sets. If you’re in a pinch during a power outage and can’t wait hours and hours to charge the station via solar panel, the Delta 2 has impressive AC charge rates if you can get it to a working outlet.

    Plugged into AC, the Delta 2 can charge at up to 1,200 watts, which lets you take it from zero to 100 percent in about an an hour and 20 minutes. The Delta 2’s aggressive charge input doesn’t run at 1,200 watts the entire time—like most laptops and phones, it eases back as it approaches full power to preserve battery longevity.

    The XT60 port can also be used for DC charging in your car (that cable is included). You also get a cigarette car lighter and two 5.5mm “barrel” ports. The cigarette charge is rated at 12.6 volts and 10 amps, or 128 watts, while the two barrel charger ports can hit 38 watts a piece at 12.6 volts. You should know that 12.6 volts over the car charger is fine, but some devices may want the full 13.6 to 14 volts a typical car alternator provides to operate. If your device needs that much voltage, the Delta 2’s DC-out may not work for it.

    The Delta’s front features four USB-A ports, and two USB-C ports. We checked the USB-C ports, which report they support USB 3.0 Power Delivery charging at 5 volts, 9 volts, 12 volts, 15 volts, and 20 volts, all at 5 amps. That means both ports can charge a USB-C laptop at up to 100 watts without issue.

    Two of the USB-A ports are the standard 5 watt, while the two blue ports on the right support more advanced charging rates using QuickCharge 2.0 and 3.0 up to 12 volts, as well as Samsung’s AFC up to 9 volts, and Huawei’s FCP up to 9 volts or 18 watts.

    The backside of the Delta 2 features six AC plugs, four are two-prong rated for the standard 15-amp output of a most American homes. The last two plugs are three-prong and rated for 20 amps. The AC output is rated at 1,800 watts total with a momentary surge rating of 2,700 watts. Turn on the Delta 2’s X-Boost mode and it can push 2,200 watts for an extended period of time. EcoFlow says X-Boost is best suited for devices that don’t need exact voltage such as a heater or power tools, and also says you should have only one port for those times. We’d recommend, for example, that you not run a rack of desktop PCs in X-Boost mode due to the lowered voltage EcoFlow uses to reach the sustained higher 2,200 watts.

    We’ve seen reports from early reviews of the pure sine wave on the Delta 2 being a little less than pure under heavy loads but looking at the output under a 1,600 watt load, all appeared fine.

    EcoFlow Delta 2: Performance

    For capacity testing, we fully discharged the Delta 2 twice to condition the battery and then charged it to 100 percent for run-down tests. For that we plugged a watt meter into the AC port and measured the energy output using a 200-watt incandescent light bulb and a small space heater drawing 800 watts. Results for both the 200-watt bulb runs reached 80 percent of the Delta 2’s 1,024Wh-rated capacity. Since the output rates can be different whether you’re discharging over AC or DC, we also ran the Delta 2 down over its USB-C port with load set to 20 volts at 3 amps or 60 watts. That’s the typical maximum charge rate for a small laptop if it were dead. Under actual use, most small laptops can use from 5 watts to 30 watts. The DC output was 828 watt hours, or basically 80 percent of its rated 1,024 capacity.

    ecoflow, delta, power, station, review

    Under heavier loads of 800 watts, we saw the capacity drop to 71 percent, however. The lower capacity may be due to the efficiency of the inverter under higher loads, how the battery discharges under a much heavier load as well, and additional power use by the Delta 2 such as its loud fans. We’ll get to the fan noise discussion below.

    With an 81 percent capacity, that means the Delta 2 gives you an actual effective capacity closer to roughly 821 watt hours—not 1,024 watt hours. That’s only slightly behind the 84 percent efficiency of competing brands.

    Fan noise

    We can’t review the Delta 2 without mentioning one of the things that bugs us the most about it: the fan noise. Under high charge rates and high discharge rates, the Delta 2’s two fans spin at very high RPM, which we measured at 57dBA three feet from the unit when the fans were on. Even worse, it’s a small-fan, shrill 57dBA. When charging at the unit’s maximum 1,200 watts, the fans kick on at full speed. It does ramp down at lower charge rates, but even on its lowest setting of 200 watts, it will run the fans and hit about 50dBA.

    Perhaps more annoying than fan noise during charging though is the fan noise during discharge or use. Power stations are supposed to be silent, but when running the Delta 2 at anything above 900 watts, the fans are at full speed. That means, if you’re running the coffee maker on battery, prepare for some fan noise while you’re at it. It’s probably as annoying as some inverter-based gas generators.

    At lower discharge rates, it’s actually not that bad and running a 1990s-era refrigerator, which uses about 172 watts, you can barely hear the Delta 2 over the fridge’s own noise.

    We can actually somewhat excuse the Delta 2 (and any power station’s) fan noise on heavy loads, as keeping the inverter and batteries cool is important for longevity and safety.

    What bugs us is the fans triggering at anything above 120 watts. If you hoped to power medical equipment in your bedroom and it uses more than 120 watts, you’ll have to listen to fans or run an extension cable out of the room.

    The good news is, EcoFlow officials tell us they plan to address the fan noise in an upcoming firmware update to the unit. The company has done so for other models after the initial release, so here’s hoping it will improve.

    EcoFlow Delta 2: App support

    Speaking of firmware updates, we actually had to install two firmware updates to the unit out of the box, which we think is a good sign. It tells us the company is actively supporting the product rather than never, ever issuing updates.

    The Delta 2 now adds support from Android and iOS devices, which the original lacked. The Delta 2 can connect to your Wi-Fi network for monitoring remotely via the internet, or if no Wi-Fi is available, you can directly connect your phone or tablet to the Delta 2 using Wi-Fi Direct. It worked fine for us, but a Bluetooth option in addition to Wi-Fi would be even sweeter, as you wouldn’t have to fiddle with the connection without internet. EcoFlow requires a login, which will annoy some. We’ve also read reports that you have to connect the app to the internet occasionally, which will be irksome to someone truly off the grid.

    In our experience, the EcoFlow app has generally been very reliable and intuitive to use. We did experience some bad calculations as it was trying to figure out real-time run-time estimates but that’s to be expected. Real-time predictions on how many “hours” of battery life are inherently as unreliable as your car trying to tell you how many miles per gallon are left not knowing you’re about to drive up a bit mountain.

    The Eco Flow app lets you tweak charge rates over AC, DC, set when it shuts off, and monitor power discharge and charge rates remotely, as well as set maximum charge and discharge rates.

    EcoFlow Delta 2: Modular expansion

    Perhaps one of the coolest features of the Delta 2 over the older model is the addition of its Extra Battery Port on the right side of the unit. This lets you connect the functional but unimaginatively named Delta 2 Extra Battery to add 1,024Wh of capacity—it’s basically another Delta 2 unit without the AC and DC ports and ups, the total capacity to 2KWh.The even larger 2KWh Delta Max Extra Battery let’s the Delta 2 reach 3KHw.

    What we really appreciate about the modular approach versus one big power station is the weight. Each can be transported separately, and can stack nicely.

    Although we didn’t review it, EcoFlow also makes a “Smart” gas-powered inverter generator that plugs into the same port.

    Should you buy the EcoFlow Delta 2?

    Overall, the Delta 2 gives you class-leading charge rates over AC, decent efficiency, and the ability to easily expand capacity. Moving to lithium iron phosphate is the icing on the cake though, providing much, much longer duty cycles. The 5-year warranty is also a bonus. Our only real ding is the fan noise, but hopefully that will get addressed in an update. At its competitive price of 999 (currently 899 on Amazon), the Delta 2 ranks as one of our top picks for a fairly priced, powerful, advanced power station with tons of expansion.

    EcoFlow Delta Mini review: Ultra-fast charging in a tiny package

    EcoFlow’s smallest Delta power station strikes the perfect balance between size, capacity, and price.

    There are a lot of use cases for portable power stations, or solar generators as they’re sometimes called.

    Some people are looking for something they can use in an emergency, while others want something that they can take camping for the weekend. Today we’re going to talk about EcoFlow’s Delta Mini power station. It has almost as much capacity as the Jackery 1,000 but is much smaller, and more importantly, it has some pretty advanced power management circuitry that puts it in the same league as much more expensive devices.

    Basic specs:

    Input may receive a portion of sales if you purchase a product through a link in this article. We only include products that have been independently selected by Input’s editorial team.

    A small-but-powerful portable power station with 882Wh of capacity.


    Unless you already have a power station, it’s actually really hard to estimate how much power you need. These batteries are measured in watt-hours, which is just load (watts) divided by time (hours). This means the Delta Mini can theoretically put out 882 watts for one hour or 1 watt for 882 hours.

    That’s still rather abstract, so let me put it this way: A 16-inch Intel MacBook Pro draws around 60 watts of power, so the Delta Mini could theoretically power it for 14.7 hours. My small window air conditioner uses about 400 watts of power when the compressor is turned on, so the Delta Mini could power it for a little over two hours if it were going full tilt.

    ecoflow, delta, power, station, review

    How much capacity does it really have?

    Now comes the fun part: testing the actual capacity. Why do we do this? For one thing, it’s just fun to charge up a battery and then discharge it completely (for science). But also: some manufacturers like to exaggerate their capacity rating while others actually understate the capacity in order to compensate for the natural degradation of the cells over time.

    So I charged up the Delta Mini to 100 percent, hooked up a Kill-A-Watt to the AC port, and then flicked on my heatgun on low power. It drew a nice, consistent 400 watts, making it easy to keep track of the battery as it ticks down.

    With the heatgun, I was able to get 770Wh out of the Delta Mini, which is right on target when you take into account the penalty for converting DC to AC. I also measured how much power it took to charge the Delta Mini via AC, and the Kill-A-Watt measured 1.01kWh. This also makes sense; fast charging does throw off a lot of waste heat.

    One thing I noticed while capacity-testing the battery was that, on the first discharge, the battery said that it was at 1 percent even though it had about 30 percent capacity remaining. Once it was fully drained and recharged, the next time I ran it down the meter was able to accurately measure the remaining capacity.

    AC output

    On paper, the Delta Mini can pump out 1,400 watts continuously, which is quite a bit. It ranks up there with the Goal Zero Yeti 1000X, which can produce 1,500 watts of continuous AC, but the Goal Zero is more expensive at 1,399.

    In my testing, I was able to run the aforementioned air conditioner, heatgun, plus an electric blower I have in my toolbox, all at the same time. These loads together added up to between 1,600 and 1,800 watts, well above the rated 1,400 watts of the Delta Mini. And this wasn’t just for a few seconds, this was continuous for about 10 minutes.

    Obviously, I wouldn’t recommend running any inverter above its rated capacity for long periods of time, but I have to hand it to EcoFlow for really delivering the goods here.

    USB and DC Output

    For home users, the Delta Mini’s DC outputs probably won’t attract much attention. But for van life and RV purposes, the DC outputs get a lot of use with things like 12v mini fridges and other mobile appliances. The 12v cigarette plug can do 126 watts, which might be cutting it close for some mini fridges.

    The situation around the front of the device is thankfully a bit better. EcoFlow has provided a full 100-watt USB-C port on the Delta Mini, meaning that even the most power-hungry laptops will be able to run on the battery without losing internal charge over time. I actually don’t have a monster laptop to test this with, but I can confirm that my little 13-inch Intel MacBook Pro was able to charge at a zippy 45 watts.


    Now to get to the good stuff. As I wrote in my Jackery 1,000 review, charging speed is critical for power stations. Goal Zero’s Yeti 1500X takes nine hours to recharge with the default 120W charger. By comparison, EcoFlow’s Delta Mini recharges in a little over 1.5 hours.

    To do that, you need to hook up the Delta Mini directly to AC power with the provided charging cord. On the back of the unit, there’s a switch that enables and disables fast charging. When this mode is enabled, the Delta Mini can soak up to 900 watts of power from the wall, which is pretty incredible.

    But AC isn’t the only way to charge the Delta Mini; it also comes with a car charger and an MC4 cable for solar panels. The car charger, in particular, is a nice pack-in from EcoFlow because it helps newbie vanlifers keep their batteries topped up, among other things. Goal Zero charges 39.95 for its car charger, so this saves you a nice chunk of change.

    Unfortunately, it seems like the Delta Mini is capped at 300 watts of solar charging capacity or around 100 watts from the car charger. This is alright, but it limits the viability of the Delta Mini for vanlife uses. That said, EcoFlow would likely point you toward its Delta Max and Delta Pro power stations for that.

    Physical design

    The Delta Mini is housed completely in plastic, but that doesn’t mean it’s not an absolute unit, because it is. This thing weighs in at 23.6 lbs, or about eight pounds lighter than the Goal Zero Yeti 1000X, its closest competitor.

    Overall the unit is very stiff, and I think it could take a beating, though perhaps not quite as much of a beating as a Goal Zero Yeti.

    EcoFlow has gone with an interesting port configuration with the Delta series: there are limited ports on the front, like USB-A and USB-C, but the unit is longer than it is wide, and all the heavy-duty ports are on the back. This follows the design principles of the EcoFlow Delta Pro with its extra batteries or gasoline generator, which would sit on either side of the main unit. I like it, it’s very tidy.


    Like I mentioned above, it is pretty difficult to estimate how much power you actually need, so an opportunity to expand the capacity of your power station provides a little bit of futureproofing. The Delta Mini isn’t expandable like EcoFlow’s Delta Max and the Delta Pro, which both have optional add-on batteries that you can connect to the main units.

    To be fair, though, I’m not aware of any power stations in the roughly 1,000Wh capacity range that have substantive expansion options. Goal Zero has its lead-acid Home Energy Kit, but at this point, it’s probably better to invest in lithium-ion batteries given the price, lifespan, and power density.

    Van life

    Despite its attractive 999 price tag, the Delta Mini is not ideal for vanlife unless you’re keeping things very low-key. It mainly comes down to the limited 300-watt solar charging capacity as mentioned above. If you kept your usage minimal (i.e. not using a 45-watt laptop all day like I did while I was traveling), you could probably make it work on sunny days (assuming you have some solar panels). But I can tell you from personal experience that a string of cloudy days can really compound, and that’s when the extra capacity of larger units comes into play.

    Around the house / garage

    This is where the Delta Mini excels mightily. The unit’s small size, light weight, and big handles make it very easy to scoop up and move around the house or garage. Plus, a 1,400-watt inverter means that you’ll be able to use the Delta Mini to power a pretty large selection of all but the most demanding power tools.

    I think this aspect — the ability to move this battery anywhere around the workshop — is severely underrated. Begone, extension cord; small power stations are my new best friend.

    Emergency use / backup power

    This is an interesting one. On the one hand, the Delta Mini doesn’t have enough capacity to serve as a whole-home backup battery — you’ll want to look at the Delta Max, the Delta Pro, or the Goal Zero Yeti 3000X or 6000X for that. So if you live somewhere with a chronic blackout problem, this unit won’t quite make the cut.

    But on the other hand, the Delta Mini’s small size and ultra-fast built-in charging flips that on its head. In an emergency, you could drive or bike to somewhere with power and charge up the whole unit in 1.6 hours. Sure, it’s not as fast as filling up a jerry can for a gas generator, but it’s something.

    One other thing to note here: you can use the Delta Mini as a sort of uninterruptible power supply as long as your load is below 800-ish watts. This probably isn’t the best idea, because there’s a 30-40 watt overhead if you do this, but I did run my PC off of the Delta Mini and it will switch over to battery power when the plug is pulled without a hitch.

    Should you buy it?

    TLDR: Yes. There really aren’t any glaring flaws with EcoFlow’s Delta Mini. The price point is right, the AC output delivers, the AC fast charging is a game changer, and even the EcoFlow app is pretty good.

    All that being said, you can sometimes find EcoFlow’s slightly larger Delta power station with 1,260Wh of capacity for just over 1,000, which is honestly a steal. But if you’re looking for something powerful and truly portable, the Delta Mini is absolutely the power station to get.

    This article was originally published on Oct. 7, 2021

    How to Optimize Solar Charging With the EcoFlow Delta 2

    The new standard of battery-powered generators is set. With up to 10 years of regular use, the LFP battery chemistry in the EcoFlow Delta 2 is one of the best of its kind.

    Whether you’re using it for home backup, to power an essential appliance, or to fuel your outdoor adventures, solar panels are the best way to keep it charged. However, a 1024 Wh capacity can go quickly if you aren’t careful. Let’s talk about how to optimize solar input for your EcoFlow Delta 2!

    Buy the Right Solar Panels

    Optimizing your solar generator starts with choosing the right panels. The EcoFlow Delta 2 can handle up to 500W of input at a time, so you can divide that up however you want for portability or efficiency.

    If you are using extra batteries (combines with Delta Max extra battery), then we recommend using the full 500W. Otherwise, the charging speed won’t supply enough energy for a fast charge.

    However, some panels are better than others. EcoFlow’s solar panels tend to work very well with these solar generators, but if you already have panels you can use, don’t let them go to waste!

    Optimize Solar Input

    With 500W of portable solar panels, you can bring your Delta 2 to a full charge in around 2 hours. The X-Boost technology allows for the fastest possible charge, which you can also supplement with wall outlets if you don’t have enough solar panels.

    For most users, we recommend the EcoFlow 250W solar panels. One panel will charge your system in around 4 hours in the right conditions, and 2 will charge it in 2 hours.

    To optimize your panel placement, place them in direct sunlight and have them face true south. Ideally, you should position them about 45 degrees upward for optimal sunlight.

    Also, just because it’s the fastest charge doesn’t mean it’s the most optimal. Every battery lasts longer with slower charges, so you don’t have to use 500W of solar panels every time. If a slow charge is right in a certain situation, low and slow is the way to go!

    Optimizing in Bad Weather

    If you need power on a cloudy or rainy day, you will need to adjust your charge times accordingly. With newer EcoFlow solar panels, you can expect them to charge at around half capacity. Still, face your panels south for the best results as you would on a sunny day!

    Check your EcoFlow app periodically to monitor its AC input, AC output, and battery capacity. This will help you make adjustments as needed for a more efficient charge for your emergency power supply.

    Achieve Power Security At Home

    The EcoFlow Delta 2 is a great way to power a wide range of devices and lower energy costs. The high output can even help you power anything from a coffee maker to larger home appliances. However, a 1024 Wh battery can’t last forever. Fortunately, you can keep it fast charging thanks to the X-Stream tech and high input capabilities!

    Stay up to date with our latest clean energy tips, and buy an EcoFlow Delta 2 today with free shipping and a price match guarantee!

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