EcoFlow DELTA Pro Ultra

Name: EcoFlow DELTA Pro Ultra
Brand: EcoFlow
Price: 4999 USD
Availability: InStock

~$4,999approx. list price

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800 WLights, phones, router, a CPAP
2,200 WFridge, freezer and the essentials
4,000 WFurnace blower, sump pump or a window AC
7,500 WWell pump or a small central AC
18,000 WWhole home with central air

7,200 W running, 10,800 W surge — sustains the furnace blower, sump pump or a window AC tier and everything below it.

Best forWhole-home backup shoppers who want Powerwall-class capability without a permanent, permitted installation.

EcoFlow's modular whole-home flagship: a 7200W inverter head that stacks up to 15 batteries for 90kWh, or triples to 21.6kW output. Price shown is the inverter + one 6.1kWh battery; the Smart Home Panel 2 (roughly $1,500-1,900 more plus electrician) is what unlocks the automatic 10-circuit backup owners actually buy this for. The recurring owner gripe is cost per kWh, which runs far above DIY wall-battery systems. Fan noise under heavy charge or load is louder than the marketing suggests, and at 164 lbs assembled you position it once and leave it. The 120A LRA rating starts most 3-ton air conditioners, which smaller stations simply cannot do. People cross-shop it against Generac standby quotes and DIY wall-battery systems; the Ultra wins on portability, loses on per-kWh cost at scale.

From the spec sheet

Specifications

Battery capacity: 6,144 Wh
Expandable to: 90,000 Wh
Continuous output: 7,200 W
Surge output: 10,800 W
Runtime: Fridge (~150W): ~35 hrs on base unit

Type: Power Station
Fuel: Battery (LiFePO4)
Outlets: 11 outlets incl. 120/240V 30A L14-30, TT-30, NEMA 5-20s, USB-C, USB-A
Transfer-switch ready: Yes
Weight: 164 lbs
Warranty: 5-year
Model: EFDPU (inverter + 1 battery)

7.2kW, stackable to 21.6kW·Up to 90kWh capacity·Starts 3-ton AC units

At a glance

Strengths

+7200W/240V single stack runs nearly any household load including central AC (120A LRA)
+Scales from 6kWh to 90kWh - buy capacity only as you need it
+Smart Home Panel 2 gives true automatic whole-panel backup
+5.6kW solar input per inverter is generator-replacement territory
+Owners report seamless outage transitions with SHP2 - lights barely flicker
+No permits or utility interconnection needed unlike installed batteries

At a glance

Drawbacks

−Ecosystem lock-in: SHP2, cables, and batteries are all pricey proprietary add-ons
−Fan noise under load is prominent - not a bedroom device
−164 lbs for inverter + one battery; genuinely two-person
−Idle/standby consumption meaningfully drains stored energy over multi-day outages
−At full build-out, cost per kWh exceeds an installed home battery

Summarised from owner discussions and forums

Owner insights

The DELTA Pro Ultra is bought as whole-house backup without a permanent battery install: an inverter and one or more 6kWh batteries feeding a Smart Home Panel 2, a generator transfer switch, or both, sometimes with several kilowatts of solar. Owners in Texas, Florida and rural Mississippi report it doing that job through outages, an ice storm and hurricanes, with a 12kWh setup covering a home office, fridge, lights and some AC for about two days in one 2,200 sq ft house; a Houston owner bought his after a derecho left him without power for four days.

Living with it means managing three things. Standby overhead is around 1kWh a day by one owner's estimate, and always-on household loads show up once the SHP2 starts reporting them. Motor starting is load-specific: one 3.5-ton heat pump would not start even with a soft starter, and one shopper comparing it with the E10 read that large central AC may need one. And when hardware fails, especially SHP2 relays, support is slow and in several cases wanted the defective unit back before shipping a replacement. Software has improved, with solar pass-through on SHP2 systems and an SHP2 firmware that fixed an owner's 240V circuit control, but one owner lists simple controls the app still lacks.

Automatic panel-level backup that can be installed in stages or taken along on a move is what sets it apart. An owner was quoted $15,000-20,000 or more for a Generac standby, and DIY EG4 or server-rack battery systems cost far less per kWh but take more wiring knowledge. The Anker SOLIX E10 is the newer rival, and one buyer weighed waiting for the DELTA Pro Ultra X while another added one.

What owners like

+When the Smart Home Panel 2 is healthy, switchover is smooth: an owner's panel flipped between grid and battery at least two dozen times overnight while a failing grid kept trying to restart, and they called it seamless, and a new two-battery install carried one home through a day-long outage four days after it went in
+Grows in steps: an owner fed an existing generator transfer switch from the inverter the day it arrived, then added the SHP2 and a 4.4kW ground mount over the following year
+Its solar inputs handle real arrays: two owners report over 4kW of solar input, one from a 10-panel ground mount, and the other says his has produced a little over 3MWh in six months of running 24/7
+Portable enough that one Texas owner says he can haul his to a deer lease or his parents' place in Houston
+A 2026 update gave DPU plus SHP2 a form of solar pass-through, so once the battery hits its limit it takes just enough solar to run the house instead of cycling the battery up and down
+Lists UL 1973 and UL 9540 certification, which one shopper weighing the Anker SOLIX E10 (only UL 9540A on its page in early 2026) flagged as the difference
+Carried a north Mississippi cattle operation through an ice storm outage: an 18kWh system ran the well pump, barn lights and calving heat lamps, recharged from a diesel generator between charges

Common complaints

−Smart Home Panel 2 relay faults have struck at bad times: one Gulf Coast owner's Relay 2 grid-side fault (170) returned on the eve of Tropical Storm Debbie and idled a four-battery system, and two other households' first SHP2s backed up only half their circuits
−Support turnaround is slow for equipment at this price: one owner's system was down for about a month with no cross-shipped replacement, another was still waiting 42 days after his solar inputs died, a third was told after three weeks of back-and-forth over dead solar ports that a replacement would ship only once the defective unit arrived, and FedEx refused one hazmat return twice
−Standby housekeeping runs around 1kWh a day by an owner's estimate, and an owner who had spent over $37,000 watched charge fall from the high 80s to the teens over a December day with no obvious cause
−Heavy motor starts are not a sure thing: a three-battery unit tripped trying to start a 3.5-ton heat pump within its stated limits and, with a soft starter fitted, still couldn't turn the compressor over
−Cost per kWh draws criticism: one estimate priced 30kWh of DPU batteries at about $22,000 against roughly $6,600 for 28.6kWh of EG4 wall batteries rated for more cycles, and an owner was asked why they had not just bought server-rack batteries
−Permits are not automatic: one inspector refused to sign off a DPU plus SHP2 install under NEC 706.15 disconnect rules, and another install needed GFCI breakers, an outside emergency stop and battery signage
−Faulty displays have sent at least two inverters back, and an owner's refurbished replacement then stopped solar charging early while reporting its limit reached
−Stacks are held together only by their own weight, and one owner found the cart wheels turn stiffly under five batteries and wants the stack secured to a wall; the inverter plus one battery weighs 164 lbs

Questions owners ask

Do I need the Smart Home Panel 2?

No. An owner fed their existing generator transfer switch from the inverter the day it arrived and added the SHP2 more than a year later, and another wired a 30-amp generator inlet and interlock instead. The SHP2 is what makes backup automatic and adds circuit-level control, but it is behind several of the worst failure reports, from a relay fault on the eve of a tropical storm to panels that backed up only half their circuits.

Will it start my central AC or heat pump?

It depends on the unit. One owner's 3.5-ton heat pump tripped the DPU on start even though its RLA and LRA were under the manual's 20A and 120A limits, and with a soft starter it still would not turn over. Another owner cycles a 3-ton AC on battery without trouble. Check the compressor's locked-rotor amps against the 120A rating; one shopper read the specs as suggesting larger 4-5 ton units may need a soft starter.

Why does my DPU drain so fast on standby?

Housekeeping runs about 1kWh a day before any household load, by an owner's estimate. Another was shocked by the idle draw the SHP2 revealed from a home server, office setup, dehumidifier, fridges and TV, and cut about 200W of it. A third saw their two stacks drop to 88% and 92% within three days of their SHP2 install with no recorded output, after they had held full charge for three weeks unconnected.

Will my inspector approve a DPU and SHP2 install?

Not always. One inspector refused to sign off under NEC 706.15, which calls for a dedicated, lockable disconnect and an external emergency shutdown for energy storage, and EcoFlow told that owner the inspector was wrong. Another owner in a strict area needed GFCI breakers, an emergency disconnect, an outside emergency stop and battery signage. One shopper notes the DPU lists UL 9540, the system standard fire codes reference.

Is it worth it compared with a DIY battery system?

On cost per kWh, no: one estimate priced 30kWh of DPU batteries at about $22,000 against roughly $6,600 for 28.6kWh of EG4 wall batteries. Owners who chose the DPU anyway point to starting small and expanding, and to being able to move it; one who started that way said they would have considered EG4 with what he knows now.

What happens if part of a DPU system fails?

Expect to send the faulty piece back before a replacement ships: owners whose inverters failed were left without them for a month or more, and one waited 42 days only to receive a standard DELTA Pro instead of an Ultra. One household ran its critical circuits through a half-working SHP2 for two weeks while support went back and forth. The owner who waited 42 days now advises keeping a backup system if you rely on the DPU for anything critical.

Head to head

Compare the EcoFlow DELTA Pro Ultra

vs Tesla Powerwall 3 vs Goal Zero Yeti Pro 4000

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EcoFlow DELTA Pro

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Best for Owners who want multi-day essentials backup now and will add batteries later, and who prefer the proven older platform even though the newer Pro 3 lists for less.

Full spec sheet Check price on Amazon