The manual prints "Rated Capacity 4096Wh 51.2V⎓ 80Ah" for the power station itself. Its capacity figure is expressed here in kWh. Expansion-battery totals are excluded. This is not a usable-energy or AC-delivered-energy figure; no depth of discharge or efficiency is applied.
EcoFlow's US product page prints "Provides stable, uninterrupted power at 120/240V with a maximum continuous output of 4000W, even during pass-through charging." The user manual prints the same 4000W as "4000W total (surge 8000W)". Manufacturer claim, not an independent test.
The manual prints "Rated Capacity 4096Wh 51.2V⎓ 80Ah" for the power station itself. Its capacity figure is expressed here in kWh. Expansion-battery totals are excluded. This is not a usable-energy or AC-delivered-energy figure; no depth of discharge or efficiency is applied.
EcoFlow's US product page prints "Provides stable, uninterrupted power at 120/240V with a maximum continuous output of 4000W, even during pass-through charging." The user manual prints the same 4000W as "4000W total (surge 8000W)". Manufacturer claim, not an independent test.
Published as 6,000 W with X-Boost. The Whole-Home Kit listing states 4,000 W, 6,000 W with X-Boost and an 8,000 W surge, so the manufacturer publishes the surge figure inconsistently.
Published claims and calculations, not independent test results.
Documents
2 on file
PDF
EcoFlow DELTA Pro 3 Portable Power Station User Manual (English, January 9, 2025 file, PDF)OfficialEcoFlowOfficial user manual
Source details
Revision
Not stated
Revision date
Not stated
Archived copy captured on 2026-10-08.
Location: PDF page 38, Technical Specifications, General, Model
Retrieved
EcoFlow's own 42-page English user manual for the DELTA Pro 3, served from EcoFlow's US manual file server (ecoflow-service-us-prod.oss-us-west-1.aliyuncs.com) and captured October 8, 2026, preserved byte for byte. It prints "Model EFD521" in its Technical Specifications (PDF page 38). Its file name carries the date 20250109. One English edition covers several regions, with US/CA values printed beside EU, UK and other regional values. No revision is printed; the revision is whatever the address served on that date. Manufacturer instructions and claims, not independent tests.
Archived copies
Archived copy of a document published by EcoFlow. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
EcoFlow DELTA Pro 3 on EcoFlow's United States store (captured October 20, 2026)OfficialEcoFlowOfficial product page
Source details
Revision
Not stated
Revision date
Not stated
Archived copy captured on 2026-10-20.
Location: Region menu and product variant data
Retrieved
The EcoFlow DELTA Pro 3 product page of EcoFlow's own United States store us.ecoflow.com, captured October 20, 2026 with the paced research fetcher to read the market it is sold for. Its region menu shows "United States (English / $ USD)" and its product data lists variant SKU EFDELTAPRO3-US. Store statements, not independent tests.
Earlier revisions, archived captures and copies published by someone other than the manufacturer. Every one stays reachable.
WEB
EcoFlow DELTA Pro 3 product pageOfficialEcoFlowOfficial product page
Source details
Revision
Not stated
Revision date
Not stated
Location: Product page headline specifications and warranty line
Retrieved
Manufacturer product page read on 19 September 2026. It establishes what the manufacturer publishes for this model on that date and nothing about measured performance, stock or third-party test results.
EcoFlow DELTA Pro 3 frequently asked questionsOfficialEcoFlowOfficial product page
Source details
Revision
Not stated
Revision date
Not stated
Location: Battery, solar charging and cycle life answers
Retrieved
Manufacturer FAQ article read on 19 September 2026. It records the manufacturer's own published answers; it is not a datasheet and states no test standard.
EcoFlow DELTA Pro 3 Whole-Home Power Kit pageOfficialEcoFlowOfficial product page
Source details
Revision
Not stated
Revision date
Not stated
Location: Specification list: net weight, dimensions, AC charging input
Retrieved
Kit listing that carries the DELTA Pro 3 specification list. Figures here describe the same unit; the kit contents and price are not used for this record.
EcoFlow DELTA Pro 3 Portable Power Station User Manual (English, January 9, 2025 file, PDF)
Archived copy of a document published by EcoFlow. Copyright retained by the publisher; kept for reference and verification only, no endorsement implied. To ask for its removal, email legal@chargedreviews.com.
The seller's link opened a different version than the priced one when we checked on , so no current price is shown. Earlier recorded prices stay in the price history.
The seller lists this as a new unit. Condition checked .
Purchased an Ecoflow Delta Pro 3 on 10/4/2025 and plugged into a solar panel setup for HV and LV panels. I have one extended battery as well. Unit has been kept indoors in a temperature controlled office.
In March 2026, a temp sensor went bad on the unit which made it think it was too cold to charge. EcoFlow tried to skirt around it with software updates, but eventually decided to replace the unit. Warranty process took a long time, but I did receive a unit that functioned.
In October 2026, the unit decided to stop charging from solar. Both HV and LV panels turned off at the same time. EcoFlow responded quickly and identified that there was a problem with the unit. I asked for further details on what specifically failed and was told, "this appears to be a device-related issue. The unit is not detecting or accepting solar input through the affected port, even though your solar panels are functioning properly when connected to the other input." I was quoted a 5 to 7 day turn around time before shipping my unit - "After the warehouse confirms receipt, please allow 5–7 business days" EcoFlow took delivery of my unit on October 21, 2026. I sent them multiple emails asking for an update during this process and did not receive any update until I called them on 11/3/2026. I was connected to their call center who said they would escalate the case. I heard back on 11/4/2026 that, "Upon checking on our end, we regret to inform you that the EcoFlow DELTA Pro 3 is currently out of stock. Unfortunately, we do not have a confirmed restock date at this time."
You can purchase a new Delta Pro 3 on EcoFlow's website right now. This really irked me and I have asked EcoFlow for a full refund. I will update this ticket with the current status. Recommend you all steer clear of the Delta Pro 3. If anyone has tips on getting a refund from EcoFlow, would appreciate your help as I'm asking them to refund me the entire order including the extra battery.
I've had 1 of these at my property for about 18 months and it works great. No complaints. It's my only source of electricity and has a 240 plug for a well pump. I use the 30 amp plug with a step up converter because you can't send power the 240 and 120 at the same time. It's small on it's own but I've partnered it up with an ecoworthy power mega 314 (w/ wattlink adapter cable), 900w of panels and It's fantastic.
I don't know about the software because I don't use it.
Seller review · Seller
5/5
Delivery
5/5
I bought the package deal with panels. All 4 panels went bad within 6 months. They were great about replacing the first 2 and probably would've the remaining 2 but I just chucked them. I think they just had a bad run at the production facility. I bought another set of 4 and all 6 have been working flawlessly for about a year.
The Evidence score uses the priorities you choose. It counts published documents, such as certificates and warranty terms, and it compares a documented figure with the best documented figure of the same kind. It does not count owner reviews, and it is not a verdict on product quality or on how many people have reviewed it. A low score can mean little is documented, or that a documented figure is below the best of its kind. Undisclosed data scores 0.
Missing details. This number counts only the evidence recorded so far. The source review for this product is not finished, or the maker has not disclosed enough, so the number can only go up.
Missing for this product: Certificates evidence needed; Warranty energy disclosure evidence needed; Cell model disclosure evidence needed.
Power stations · Output unconfirmed · Rated capacity
The warranty term and the lifetime energy are each scored against the best documented value for a power station: a value earns its share of that best, times the weight. A documented value always earns points; an undisclosed one earns 0.
Research pending, 0 points: Certificates, Warranty energy disclosure, Cell model disclosure.
Computed from public specifications and evidence records. Warranty duration is not service quality; certificate evidence points are not a safety rating. Compatibility and installation limits still apply.
No sourced accessories or replacement parts listed yet.
Model history
Model identity
Model
DELTA Pro 3
US market · Earlier class: Solar generator
No historical observations recorded yet.
Community discussions
1
Links to DIY Solar Forum threads. The title is the forum's own words. It is a member's experience, not a Charged test, not a verified fault rate, and not a statement by the maker.
