The EcoFlow DELTA 2 is a portable power station built around a 1024Wh LFP battery, with a 1,800W AC inverter, six AC outlets and unusually fast wall charging. It has been a common choice for van setups, camping and short home outages. This guide goes through what EcoFlow publishes about it and what those numbers imply for real use.
Status: EcoFlow does not say the DELTA 2 is discontinued, and its DELTA 2 page was still live when we checked. But the older US store address for the DELTA 2 now redirects to the DELTA 3 product page, which suggests the DELTA 3 is its successor there. The user manual we read is version 1.0, dated December 2022. Confirm availability and current pricing before you plan a purchase; the US page we read did not show a price.
How this review was produced: we do not buy or test the products we cover. This is a desk analysis of manufacturer specifications, manuals and documentation, safety and certification listings, and publicly available owner reports and third-party reviews. Figures are manufacturer claims or reported owner results.
The product card below is a separate Amazon listing for the EcoFlow DELTA 3 (1024Wh), the newer DELTA model that EcoFlow’s store now points DELTA 2 shoppers to, not the DELTA 2 reviewed here.
What EcoFlow Publishes
- Capacity: 1024Wh (51.2V), LFP (LiFePO4) chemistry
- Cycle life: 3,000 cycles to 80% or more of capacity, per EcoFlow’s manual and product page
- AC output: 1,800W continuous, 2,700W surge, 120V, 50/60Hz, six AC outlets (pure sine wave); X-Boost described for devices up to 2,200W
- USB-C: two ports, 100W maximum each, 200W in total
- USB-A: two ports at 12W maximum each and two fast-charge ports at 18W maximum each
- DC: one 12V car outlet (12.6V, 10A, 126W maximum, shared with the DC5521 ports) and two DC5521 ports (12.6V, 3A, 38W maximum each)
- AC charging: X-Stream fast charge up to 1,200W; EcoFlow’s page claims 0 to 80% in 50 minutes and 0 to 100% in 80 minutes
- Solar input: 11-60V, 15A, 500W maximum; EcoFlow’s page claims a full charge in 3 to 6 hours
- Car input: 12V or 24V battery at a default 8A; an optional 800W alternator charger is claimed to add 1kWh in 1.3 hours
- Size and weight: approximately 12 kg (27 lb); 400 x 211 x 281 mm (15.7 x 8.3 x 11.1 in)
- Switchover: EPS function, automatic switch to battery within 30ms
- Temperature: discharging -10 to 45C (14-113F), charging 0 to 45C (32-113F); best performance at 20-30C (68-86F)
- Warranty: 5 years, per EcoFlow’s US warranty policy table
Capacity in Practical Terms
A 1024Wh battery never delivers all 1024Wh to your devices, because the inverter and the battery electronics use some. As an assumption, not an EcoFlow figure, we use about 85% usable, which is roughly 870Wh. These are estimates for illustration, not measured runtimes.
- A 60W load, such as a small fridge drawing continuously, would run roughly 14 hours on about 870Wh. A fridge that cycles on and off would stretch longer.
- A 300W load, such as a laptop, a monitor and some lights together, would run for just under 3 hours.
- A load near the full 1,800W rating would drain the battery in under half an hour, which is a reminder that the inverter can deliver far more power than the battery can sustain.
The battery is the limiting number for backup use. The inverter rating tells you what you can switch on; the 1024Wh tells you how long you can keep it on.
Outputs and What They Run
The 1,800W continuous rating and 2,700W surge figure cover most small appliances and many power tools. The six AC outlets make it easy to run a router, a TV, a lamp and a charger at once without a power strip. EcoFlow’s X-Boost mode is described as supporting devices up to 2,200W, which in general is aimed at heating loads like a kettle or a space heater that would otherwise exceed the continuous rating. Motors and compressors have their own starting demands, so check the specific appliance.
On the small ports, two USB-C connections at 100W each, or 200W in total, are enough to charge a laptop and a phone together at full speed. The 12V car outlet is rated at 126W and shares power with the two DC5521 ports, so do not expect to run all of them at their individual maximums.
Charging Speed
Fast wall charging is the DELTA 2’s most distinctive trait. At the 1,200W X-Stream input, EcoFlow claims 0 to 80% in 50 minutes and a full charge in 80 minutes. The arithmetic is plausible: 1024Wh at 1,200W is about 51 minutes if charging stayed at full speed, and batteries slow down near the top, which fits the longer 80-minute figure. Those times assume a wall outlet that can supply the full input, so a weak extension cord or a shared circuit can lengthen them.
The solar input accepts up to 500W at 11-60V, and EcoFlow claims 3 to 6 hours for a full charge. Even at 500W, the ideal time is about 2 hours, so the claimed range allows for less than perfect sun. Because the input is a single high-wattage channel, panel wiring and voltage matter, and the manual mentions an MC4-XT60 adapter cable supplied with EcoFlow’s own solar panel. In a vehicle, the default 12V socket input is slow at 8A, and the optional 800W alternator charger is the faster route, claimed at 1kWh in 1.3 hours.
Weight, Size and Cold
At approximately 12 kg (27 lb), it works out to about 85Wh per kilogram. That is light for a 1kWh-class unit with this much output and easy to carry to a car, though it is still a firm two-hand lift.
The temperature limits matter in winter. EcoFlow lists discharging down to -10C but charging only from 0C, so a unit stored in a cold garage or a van can run loads but cannot be recharged until it warms. EcoFlow also states optimal operation at 20-30C, so expect cold weather to reduce what you get out of any LFP battery.
Expansion and Backup Use
The manual says one DELTA 2 connects to one Smart Extra Battery, and EcoFlow’s product page cites 2kWh with one DELTA 2 Extra Battery. The page also mentions a larger expandable range, but we could not verify that figure on a manufacturer page, so we do not repeat it. A second battery doubles the runtime but not the output, since the inverter stays at 1,800W.
For outages, EcoFlow describes an EPS function with automatic switchover within 30ms. The manual says it does not support 0ms switching and should not be used for servers or workstations. That means lights, a router and a fridge are reasonable matches on paper, while a desktop PC or a medical device that cannot tolerate any interruption is not.
Who It Suits
- Van and camping setups that need fast recharging from a wall outlet or alternator.
- Households that want a fridge, router and lights covered through short outages.
- Buyers who value the long cycle rating and the 5-year warranty.
Who Should Skip It
- Anyone who needs a true uninterruptible supply for a desktop or a server.
- Buyers who need to run large appliances for hours; 1024Wh is a small tank.
- Anyone who wants the current model, since DELTA 3 appears to have replaced it on EcoFlow’s US store.
Frequently Asked Questions
How many cycles does EcoFlow rate the DELTA 2 for?
EcoFlow rates the LFP battery for 3,000 cycles to 80% or more of capacity, and its product page describes that as about 10 years of daily use. These are manufacturer claims; we did not test the battery.
How much can the DELTA 2 power at once?
EcoFlow’s US manual lists 1,800W of continuous AC output with a 2,700W surge. Its X-Boost feature is described as supporting devices up to 2,200W, but check your appliance’s rating and EcoFlow’s X-Boost notes before relying on it.
Can it be used as a UPS?
EcoFlow describes an EPS function that switches to battery within 30ms. The manual says it does not support 0ms switching and is not meant for servers or workstations, so it is a poor choice for protecting a desktop computer.
How fast does it charge?
EcoFlow claims 0 to 80% in 50 minutes and 0 to 100% in 80 minutes from a wall outlet using the 1,200W X-Stream input. Solar input is up to 500W, with a claimed full charge in 3 to 6 hours.
Can I add more capacity?
EcoFlow’s manual says one DELTA 2 connects to one Smart Extra Battery, and its product page cites 2kWh with one DELTA 2 Extra Battery. The page also mentions a larger expandable range, but we could not verify that figure, so we leave it out.
Is the DELTA 2 still current?
EcoFlow has not said it is discontinued, and its DELTA 2 page was still live when we checked. However, the older US store link for DELTA 2 now redirects to the DELTA 3 page, which suggests DELTA 3 is the successor. Check current availability before buying.
Bottom Line
On paper the DELTA 2 is a strong all-rounder: 1024Wh of LFP, 1,800W of AC, fast wall and solar charging and a 5-year warranty. Its limits are just as clear in the specs: 1024Wh is modest capacity, the 30ms switchover rules out sensitive computers, and the cold charging limit of 0C needs planning. Check whether the DELTA 3 now suits you better before you buy, and weigh our figures as manufacturer claims, because we have not tested the unit.
