EcoFlow DELTA Pro

Specs checked

Our take

A very large box with wheels. It keeps a fridge, Wi-Fi and phones going for about 20 hours. It weighs 99 lb, so plan on two people to lift it.

3,600 Wh: Watt-hours: how much it holds
3,600 W: Watts: how fast it gives power
7,200 W: Surge: a short burst for start-ups
99 lb: Weight: how heavy to carry

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EcoFlow DELTA Pro run time: how long it runs your things

Refrigerator 26 h

Wi-Fi router 204 h

Phones 153 h

Lights 77 h

CPAP machine 77 h

TV 31 h

Laptop 47 h

Fan 61 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

This is the DELTA Pro with no number after its name, not the DELTA Pro 3. What splits them is how much they hold: 3,600 watt-hours here, 4,096 in the DELTA Pro 3. Watt-hours are how much power a box holds. This box gives up to 3,600 watts; the DELTA Pro 3 gives 4,000. Watts are how fast something uses power. This box's surge is 7,200 watts. Surge is a short burst some things need to start.

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 20 hours.
Fridge alone: about 26 hours.
A window AC that runs at 900 watts: about 3.4 hours.
A sump pump that runs at 960 watts: about 3.2 hours.

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

Why this one and not the DELTA Pro 3

This box weighs 99 pounds; the DELTA Pro 3 weighs 113.5. By our math the DELTA Pro 3 runs a fridge, Wi-Fi and phones for about 22 hours; this box, about 20. The DELTA Pro 3 has 7 wall-style outlets; this box has 5.

Moving it and charging it

99 pounds is a two-person lift. EcoFlow says it charges fully in 2.7 hours from a 120-volt wall outlet.

The limit

EcoFlow also lists a mode called X-Boost for up to 4,500 watts. That is a boost mode, not surge.

EcoFlow's big battery life number is 6,500 cycles, but that is to 50% capacity. To 80% it lists 3,500.

Two things we could not settle. EcoFlow's US spec table says 5 outlets; another answer on the same page says 4. We go by the table. And EcoFlow's page says the warranty is 3 years; its warranty page says 2. Both say 5 if you register the box.

Bottom line: a very large box for long outages, lighter than the DELTA Pro 3, with fewer hours and fewer outlets.

Good for

Long outages and big things like a window AC or a sump pump. By our math it runs a fridge alone for about 26 hours.

Not for

Anyone who has to lift the box or take it up stairs. It weighs 99 lb.

EcoFlow DELTA Pro 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)	3,600 Wh
Watts (how fast it gives power)	3,600 W
Surge (short burst for start-ups)	7,200 W
Weight	99 lb
Battery type	LiFePO4
Battery life	3,500 cycles to 80% capacity; 6,500 cycles to 50% capacity
Time to charge from the wall	Full in 2.7 hours from a 120V wall outlet (1,800W input). EcoFlow lists 1.8 hours at 240V (3,000W).
Most solar it can take	1,600 W
Wall-style outlets	5
Fastest USB-C port	100 W
Switch-over time in an outage	30 ms
Can you add batteries?	Yes. Up to two DELTA Pro Smart Extra Batteries.
Warranty	2 years
Size	25 x 11.2 x 16.4 in