EcoFlow, plug-in battery with built-in microinverter
EcoFlow STREAM Ultra
Also written as STREAM Ultra, EcoFlow STREAM
A 1.92 kWh LFP battery with a built-in microinverter that plugs into a household outlet and takes up to 2,000 W of solar.
Best for
Storing midday solar for the evening, in a state where EcoFlow permits its plug-in installation.
Photo pending: we only show images we own or are licensed to use.
Strengths and limitations
Strengths
- 1.92 kWh LFP, expandable to 11.52 kWh (EcoFlow).
- 2,000 W of solar input across 4 MPPT inputs, plus 1,200 W more through the STREAM Microinverter (EcoFlow).
- Anti-islanding protection listed (EcoFlow).
- Keeps 70% of its capacity after 6,000 cycles, per Solar Builder.
- NEMA 4 enclosure for indoor or outdoor use (EcoFlow).
Limitations
- 23.1 kg, about 51 lb (EcoFlow).
- Where it may be installed is narrow, and EcoFlow's own pages disagree.
- No UL 3700 certification is named on the US product page.
What it does not do
- Install as a plug-in system in most states: EcoFlow's US store says self-install is available in Utah only, and its global page lists Utah, Maryland and Colorado.
- Run the whole house: grid-side output is rated 800 W, 1,200 W at most.
- Plug into a power strip or an extension of its AC cable (EcoFlow Q&A).
Specifications
From the cited source on 2026-11-09. "Not verified" means no source we checked published it.
| Capacity | 1.92 kWh LFP [1] |
|---|---|
| Expandable to | 11.52 kWh [1] |
| Solar input | 2,000 W (4 MPPT) [1] |
| Grid-side AC output | 800 W rated, 1,200 W max, 120 V 60 Hz [1] |
| Plugs into | NEMA 5-15 or 5-20 outlet [1] |
| Protections | Output overcurrent, output overvoltage, anti-islanding [1] |
| Enclosure | NEMA 4 [1] |
| Cycle life | 70% capacity after 6,000 cycles [3] |
| Weight | 23.1 kg [1] |
| Where installation is permitted | US store: Utah only. Global page: Utah, Maryland and Colorado. [2] |
| UL 3700 | Not verified |
Power and travel notes
Rated capacity: 1920 Wh. Over 160 Wh: forbidden on passenger aircraft per FAA. Shipping by carrier follows separate DOT and carrier rules.
Real runtime is less than capacity divided by load: conversion losses, battery reserve and temperature all cut into it. Size a battery for your fridge.
Before you buy
- A grid-tied battery is not covered by most US plug-in solar laws. TechRadar reports that in the US these products need professional installation.
Sources
- EcoFlow STREAM Ultra (US store), EcoFlow (manufacturer), read 2026-11-09. 1.92 kWh LFP, expandable to 11.52 kWh; 2,000 W solar input (4 MPPT) plus 1,200 W via STREAM Microinverter; max 1,200 W grid-tied AC output, rated 800 W at the grid terminal, 120 V 60 Hz; plugs into NEMA 5-15 or 5-20; NEMA 4; anti-islanding protection listed; 23.1 kg; Q&A says self-install is available in Utah only.
- EcoFlow STREAM Ultra (global store note), EcoFlow (manufacturer), read 2026-11-09. Note on the page: plug-in solar installation of this product is currently permitted in Utah, Maryland and Colorado. Differs from the US store Q&A (Utah only).
- EcoFlow STREAM now available in Utah along with new smart meter, Solar Builder (news), read 2026-11-09. STREAM Ultra LFP retains 70% capacity after 6,000 cycles; NEMA 4 enclosure; Microinverter NEMA 6.
- Plug-in solar shone at IFA 2026, TechRadar (news), read 2026-11-09. In the UK and US, grid-tied plug-in batteries are not currently a legal part of plug-in solar, so those products need professional installation.