Will an EcoFlow DELTA Pro 3 run a sump pump? (US 120 V)
Yes, it runs it — no usable-capacity figure see why below ↓
Every check passes: 920 W running against 4,000 W continuous, and 2,650 W at start-up inside a 8,000 W ceiling. What this page will not do is turn a nameplate watt-hour rating into hours — see the evidence below for why.
officialverified 2026-08-01US 120 V unit × sump pump
Two numbers decide this, and readers arrive using them interchangeably. Watts are the ceiling on what the inverter can hold at any instant — a sump pump needs 920 W of them while it runs, and 2,650 W for the instant it starts. Watt-hours are how much energy the battery holds, and the EcoFlow DELTA Pro 3 holds 4,096 Wh of them on the nameplate. A machine can have plenty of one and not enough of the other.
The verdict above is a calculation — running watts, start-up inrush and inverter waveform against this machine's continuous output and surge ceiling — not a lookup. What it will not do is print a runtime, and the reason is specific: EcoFlow publishes no depth of discharge or inverter efficiency for this model, so there is no usable-capacity figure to divide.
Where those numbers come from
Every figure below carries the tier it came from and the date it was checked. A blank is never left blank: a field the manufacturer does not publish says so, and a field whose sources disagree — two documents, or one document with itself — says that instead of picking one.
No usable-capacity figure for this machine
EcoFlow publishes a nameplate watt-hour number and nothing about depth of discharge or inverter efficiency for this model. Dividing the nameplate by this load would be wrong by 20–35% in the flattering direction, so this page shows the nameplate for what it is and refuses to turn it into hours.
Missing: station.usable_capacity_wh
Energy rate instead of a runtime
920 Wh per hour while it is actually runningThis number needs no battery figure at all, which is why this page can give it when it cannot give hours. Divide any usable-capacity figure you trust by it and you have your own runtime, with our arithmetic visible instead of hidden.
What a sump pump demands
The engine checked 2,650 W — where a record publishes both an absolute inrush and a multiple of running power, the more demanding of the two is used rather than the flattering one.
Start-up figure Manufacturer nameplate (locked-rotor)
The start-up figure is the manufacturer’s own locked-rotor rating, off a spec sheet for a real model in this class — not a category multiple. Where a standards table and the nameplate disagree, this library uses the nameplate: the standards figure is a selection envelope for breakers and controllers, and sizing a battery to it over-specifies the machine by two to four times.
What the EcoFlow DELTA Pro 3 offers
Where to buy
Where to buy the EcoFlow DELTA Pro 3
Prices checked 2026-08-01
If this is not the pairing
BLUETTI Elite 100 V2 (US 120 V) reaches the same conclusion on a sump pump at 1,800 W continuous, and it is $499. Cheaper is only cheaper when the answer is the same — this one is. See that pairing →
The same load on the machines beside it
The same machine on the loads beside it
Where to go next
A sump pump has a guide of its own: the same records this page computes from, worked through in prose with room for the reasoning a table can only summarise — Can a power station really keep my sump pump running through a storm?