EcoFlow DELTA Pro 3

How long it runs each appliance

One at a time, on one charge: a CPAP about 64 hours, a sump pump about 26 hours, a window air conditioner about 4.8 hours. It can start every appliance we track.

How far it goes with extra batteries

No furnace (about 130 W): 27 hours on one charge. Prices: station checked October 3, 2026, extra battery October 3, 2026, panel October 3, 2026. One unit takes two extra batteries at most (manual); three units on Smart Home Panel 2 reach 36,864 Wh, which EcoFlow calls 36 kWh (EcoFlow). EcoFlow’s “up to 48 kWh” also counts three EcoFlow Smart Generators (EcoFlow). Batteries alone stop at 36,864 Wh.

How it connects to your house

Its 30 A twist-lock outlet (L14-30R) feeds an inlet box and transfer switch (EcoFlow). The outlet is rated 16.7 A (manual), so the station sets the limit. Smart Home Panel 2 switches by itself and takes up to three units (EcoFlow); it must be installed (EcoFlow).

• Manual switch kit: the Reliance Controls 310CRK ten-circuit transfer switch kit has the switch, inlet box and L14-30 cord in one box. $475 at Amazon
• Automatic panel: EcoFlow Smart Home Panel 2. $1,599 at Amazon

Amazon prices checked October 3, 2026. A transfer switch is required (manual). Use a licensed electrician and a permit. Which switch fits · All ways to connect.

Questions buyers ask

The manual: EcoFlow DELTA Pro 3 user manual (PDF).

Can you add an extra battery?

Yes, up to two. The DELTA Pro 3 Smart Extra Battery holds 4,096 Wh, the same as the station. It cost $1,799 on Amazon on October 3, 2026: $517 per usable kWh, against $804 for the station. Two of them bring one unit to 12,288 Wh, about 10.4 kWh usable. The older DELTA Pro Smart Extra Battery fits too (EcoFlow). Extra batteries for every station.

Is it 8,000 watts?

No. 8,000 W is the peak, for a motor starting up. It runs 4,000 W all the time, or 6,000 W for heaters with X-Boost turned on (EcoFlow). For more power, two units on EcoFlow’s 50 Amp Hub double the output, up to 33 A in the US (manual). EcoFlow also sells an “8kWh” kit: one station plus one extra battery.

What solar input does it take?

Up to 2,600 W through two inputs (EcoFlow). The high-voltage input takes 30–150 V, up to 1,600 W. The low-voltage input takes 11–60 V, up to 1,000 W (manual). Keep each string’s open-circuit voltage (Voc) under the limit. Bob Vila saw 320–335 W from one 400 W panel (Bob Vila). Robb Sutton got about 1,100 W from three 400 W panels on a cloudy day (Robb Sutton). Which panels fit.

Can it run 240 V appliances?

Yes. The 240 V button turns on the L14-30 twist-lock outlet and a 6-20R 240 V outlet, and turns the 120 V outlets off (EcoFlow). So it gives 120 V or 240 V, not both at once.

How long does it take to charge?

From a normal 120 V outlet it takes up to 1,800 W, so a full charge takes at least 2.3 hours. Testers measured about 3 hours (The Solar Lab; OutdoorGearLab). EcoFlow’s “80% in 50 minutes” uses faster sources together, up to 7,000 W (EcoFlow).

Is it waterproof?

Only the battery pack inside is IP65 (manual). The unit is IP20 (EcoFlow), so use it indoors or outside under cover (EcoFlow).

How heavy is it? Does it have wheels?

113.5 lb, with wheels and a pull-out handle (manual). Bob Vila’s tester used a cart on grass and gravel (Bob Vila) and two people to load it (Bob Vila).

Can it work as a UPS?

Yes, with a 10 ms switchover (manual). One tester’s desktop PC still shut off during a switch (Robb Sutton). Plugged into the wall, it passes through about 1,800 W (CleanTechnica).

DELTA Pro 3 vs DELTA Pro Ultra

The Ultra is EcoFlow’s bigger, two-piece system. Pick the DELTA Pro 3 for one box that rolls and up to 12 kWh. Pick the DELTA Pro Ultra if you need more than 4,000 W at once or more than 12 kWh on one unit. Their batteries do not mix (EcoFlow).

• Battery. Pro 3: 4,096 Wh in one box. Ultra: 6,144 Wh per battery, plus a separate inverter.
• Most on one unit. Pro 3: 12,288 Wh (2 extra batteries). Ultra: 30 kWh (5 batteries).
• Most in a system. Pro 3: 36 kWh (3 units). Ultra: 90 kWh.
• Output. Pro 3: 4,000 W; 8,000 W peak. Ultra: 7,200 W; 10.8 kW peak.
• Solar. Pro 3: 2,600 W. Ultra: 5,600 W.
• Weight. Pro 3: 113.5 lb. Ultra: 70 lb inverter + 111.8 lb battery.
• Switchover. Pro 3: 10 ms. Ultra: under 20 ms; 0 ms on some outlets.
• Weather rating. Pro 3: IP65 battery pack; IP20 unit. Ultra: IP54.
• Price. Pro 3: $2,799 on Amazon, October 3, 2026. Ultra: $4,199 at EcoFlow, October 1, 2026.

Ultra figures from the DELTA Pro Ultra page, read October 1, 2026. Other brands: DELTA Pro 3 vs Anker F3800 vs Jackery 5000 Plus · Expansion batteries for every station · How long a power station runs a refrigerator. Also not the same unit: EcoFlow DELTA 3 Plus (1,024 Wh), EcoFlow DELTA 3 (1,024 Wh), EcoFlow DELTA Pro (3,600 Wh). Read the model name on the unit’s label.

What testers found

We do not test units ourselves. These testers did.

• Bob Vila’s tester used one for two months (Bob Vila). In a camper he measured a fridge at 170–180 W and an air conditioner at 755–780 W (Bob Vila). After Friday night to Sunday morning it still had 18% left (Bob Vila).
• OutdoorGearLab measured 3,790 of 4,096 Wh (OutdoorGearLab), more than the 3,482 Wh we plan on.
• A 3-ton central air conditioner with a soft-start kit still tripped its overload (Robb Sutton).

Specifications

Buying the right one

We link the bare DELTA Pro 3 (ASIN B0D14FMFZD, checked October 3, 2026). Search results also show kits with panels or a battery, and the older DELTA Pro.

Recall check: no CPSC recall names the DELTA Pro 3 (model EFD521) in our screen of September 29, 2026. That cannot clear your own unit. Check its serial number with EcoFlow (EcoFlow recall lookup) or the CPSC recall search.