EcoFlow DELTA 2 Max

Specs checked

Our take

A large box that can grow. It keeps a fridge, Wi-Fi and phones going for about 11 hours, and EcoFlow says you can add two extra batteries. At 50 lb it is a two-hand lift.

2,048 Wh: Watt-hours: how much it holds
2,400 W: Watts: how fast it gives power
4,800 W: Surge: a short burst for start-ups
50 lb: Weight: how heavy to carry

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EcoFlow DELTA 2 Max run time: how long it runs your things

Refrigerator 15 h

Wi-Fi router 116 h

Phones 87 h

Lights 44 h

CPAP machine 44 h

TV 17 h

Laptop 27 h

Fan 35 h

Estimates. Your devices may use more or less. One thing at a time, from a full box. We keep 85% of the watt-hours, because some power is lost on the way out.

What we think

The DELTA 2 Max and the DELTA 3 Max hold the same: 2,048 watt-hours. Watt-hours are how much power a box holds. Both give up to 2,400 watts. Watts are how fast something uses power. EcoFlow lists a surge of 4,800 watts for both. Surge is a short burst some things need to start, like a pump motor. What splits them is weight and solar. This box weighs 50 pounds and takes up to 1,000 watts of solar panels. The DELTA 3 Max weighs 44.8 pounds and takes up to 500.

What that means in an outage

By our math, counting a fridge at 120 watts, Wi-Fi at 15 and phones at 20:

Fridge, Wi-Fi and phones: about 11 hours.
Fridge alone: about 15 hours.
A sump pump that runs at 960 watts: about 1.8 hours.

These are estimates. Your devices may use more or less.

Why this one and not the DELTA 3 Max

EcoFlow says this box takes up to two extra batteries, for 6,144 watt-hours in all. EcoFlow does not say if the DELTA 3 Max takes one. This box has 6 wall-style outlets; the DELTA 3 Max has 4. If you have to move the box, we would pick the DELTA 3 Max. It is 5.2 pounds lighter.

Moving it and charging it

50 pounds is a two-hand lift. EcoFlow's manual says it charges fully from the wall in about 80 minutes.

The limit

2,400 watts runs a space heater that uses 1,500 watts. But by our math the box is empty in about 1.2 hours. EcoFlow also lists a mode called X-Boost for up to 3,400 watts. That is a boost mode, not surge.

When the power goes out, EcoFlow's manual says this box switches to battery within 20 milliseconds. EcoFlow's page lists under 10 for the DELTA 3 Max.

Bottom line: a large box for about 11 hours of fridge, Wi-Fi and phones, for people who want to add batteries later.

Good for

Outages that last through the night, and people who may want to add batteries later. By our math it runs a fridge, Wi-Fi and phones for about 11 hours.

Not for

Anyone who has to carry the box often or up stairs. It weighs 50 lb; the DELTA 3 Max weighs 44.8 lb.

EcoFlow DELTA 2 Max specs: the numbers

Every number comes from the maker’s own page. If we could not confirm one, it says “We’re checking”.

Watt-hours (how much it holds)	2,048 Wh
Watts (how fast it gives power)	2,400 W
Surge (short burst for start-ups)	4,800 W
Weight	50 lb
Battery type	LiFePO4
Battery life	3,000 cycles to 80%+ capacity
Time to charge from the wall	Full in about 80 minutes from the wall (1,800W max), per the manual.
Most solar it can take	1,000 W
Wall-style outlets	6
Fastest USB-C port	100 W
Switch-over time in an outage	20 ms
Can you add batteries?	Yes. Up to two DELTA 2 Max Smart Extra Batteries, for 6,144Wh in all.
Warranty	5 years
Size	19.6 x 9.5 x 12 in