EcoFlow Stream Microinverter
EcoFlow's low-cost entry into US plug-in solar: a 1200W microinverter that connects to a standard 120V outlet, self-install legal today in Utah.
Characteristics
- Grid output: 1200 W nominal, 120V / 60Hz
- Solar input: 3 MPPT, up to 1350 W of panels
- Startup: From 3 W of sunlight, dawn to dusk
- Certification: UL1741 certified, net metering required
- Utah-legal plug-in microinverter, no electrician
Detailed overview: EcoFlow Stream 1200W plug-in solar microinverter
The EcoFlow Stream Microinverter is the entry point into EcoFlow's STREAM lineup, the plug-and-play home solar system the company launched for the US market in 2025. Its job is simple: convert the DC current from solar panels into 120V, 60 Hz AC power and feed it into the home through a standard household outlet, with no work on the electrical panel and, in Utah, no electrician.
It carries three independent MPPT trackers across four pairs of PV terminals, for up to roughly 1350 W of connected panels, letting installers mix panel orientations without one shaded module dragging down the rest. Nominal grid output is 1200 W, notably higher than the 800 W ceiling common on European balcony inverters, a direct result of the different power cap set by US plug-in solar rules such as Utah's HB 340. The microinverter starts producing from as little as 3 W of sunlight, so it keeps working in the low light of early morning and dusk.
It is UL1741 certified, the established safety standard for grid-tied inverters, and includes built-in protection against overcurrent, overvoltage and anti-islanding (it stops feeding the grid during an outage, for utility worker safety). EcoFlow is explicit on its own product page that buyers should confirm their electricity billing supports net metering before purchasing: without it, any surplus power sent to the grid while it is not being used in the home is simply lost, since the microinverter has no storage of its own. It can be paired with a STREAM Ultra battery, sold separately, to bank that surplus instead.
As with the rest of the STREAM lineup, EcoFlow currently markets plug-and-play self-install specifically for Utah, under HB 340's exemption for small plug-in systems from permits and utility interconnection agreements. Buyers in other states should check local rules, since the list of states with similar laws has been growing.
Full specifications
Detailed characteristics
Power and protection
| Output power?Maximum power delivered (for storages with a 230 V output). | 1200 W |
|---|
Solar section
| MPPT controllers?Number of built-in MPPT solar controllers (lets you connect panels facing different directions). | 3 |
|---|---|
| Max solar input?Maximum connectable PV power. | 1350 W |
| Micro-inverter?Power of the inverter that feeds energy back into the home grid. | 1200 W |
Connectivity
| Wi-Fi?Remote control and updates over Wi-Fi. | Yes |
|---|
Durability and format
| Ingress protection?Water and dust resistance (IP rating). | IP67 |
|---|---|
| Weight?Weight of the battery. | 7.1 lb (3.2 kg) |
| Dimensions (L × W × H)?Length × width × height, in millimetres. | 9.9 × 7.1 × 1.4 in (252 × 180 × 35 mm) |
Availability and warranty
| Warranty?Length of the manufacturer's warranty. | 10 years |
|---|
Comparison
The Stream Microinverter competes with a small but growing field of US plug-in microinverters, most notably the Hoymiles HiFlow Pro, launched in 2026 as the first US microinverter certified to the new UL 3700 plug-in solar standard.
| Criterion | EcoFlow Stream Microinverter | Hoymiles HiFlow Pro (per unit) |
|---|---|---|
| Nominal output | 1200 W, single unit | 360 to 500 W, stack up to 4 for 1200 W |
| Solar input | 3 MPPT, up to 1350 W | 1 MPPT per unit, one panel each |
| Certification | UL1741 | UL3700 (first in the US) |
| Entry price | ≈ $369 | ≈ $169 for one 360 W unit |
In short, the Stream Microinverter reaches the full 1200 W in a single box and, at full scale, costs less per watt than stacking four HiFlow Pro units. The Hoymiles route lets a household start smaller and cheaper with one panel, then add units over time, and carries the newer UL 3700 certification built specifically for this category. Either way, both still depend on your own state's plug-in solar rules for a self-install purchase today.
Related video
Video: EcoFlow Stream microinverter: buying guide, test and review - Published on 03/05/2025
Our tester's review: Julien De Jurquet
As a way to dip a toe into US solar without a full battery system, the Stream Microinverter makes a strong case. At $369 it is the cheapest entry point into EcoFlow's STREAM lineup, and the promise holds up: bolt it behind a couple of panels, plug its cord into a standard 120V outlet, and the EcoFlow app walks through setup in minutes, no electrician required in Utah. Its 1200 W nominal output is notably higher than the typical European balcony cap, thanks to Utah's more generous HB 340 limit. The catch, which EcoFlow itself flags, is that it only makes sense with net metering. Without it, power sent to the grid while nobody is home is simply given away, with no battery to bank that surplus. It is also, for now, a Utah-only product for self-install; shoppers elsewhere need a licensed electrician and a standard interconnection agreement instead. Within those bounds, it is an honest, capable, well-priced way to start.
In-depth review EcoFlow Stream (Microinverter): Our Full Review 4.0/5 Read our full review → Efficiency 3.9 Portability and size not measured Weather resistance not measured Output ports not measured Capacity and expansion not measured Solar input and MPPT 4.3 Control and smart features 3.7 Installation and compliance 4.4 Build and endurance 3.8 Battery compatibility not measured Safety and protections not measuredFrequently asked questions: EcoFlow Stream 1200W plug-in solar microinverter
EcoFlow currently markets self-install specifically for Utah under HB 340. Other states have since passed similar plug-in solar laws, so check your state and utility before assuming a DIY install is allowed where you live.
Yes, and EcoFlow says so directly: without net metering, any power sent to the grid while you are not using it is simply given away, since this unit has no battery to store it for later.
Up to roughly 1350 W across three MPPT trackers and four pairs of PV terminals, for a nominal grid output of 1200 W, higher than the typical 800 W cap used in Europe.
Yes, it pairs with the EcoFlow Stream Ultra battery, sold separately, to store surplus power instead of exporting it, useful if net metering is not available or not favorable.
Yes, it is UL1741 certified with built-in overcurrent, overvoltage and anti-islanding protection, meaning it automatically stops feeding power out during a grid outage.
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