The EcoFlow 400W kit pairs one foldable 400W solar panel with one STREAM microinverter to help offset a portion of your daytime electricity use. Its distinguishing feature is the foldable panel: the protective case doubles as a kickstand, and the panel folds for storage or a move. This guide covers what is included, panel placement, power output, safe setup and the questions to answer before buying.

It is not whole-home power or an outage-backup system. There is no battery in this kit, and the microinverter stops supplying power when the grid goes down.

In this guide

• Bottom line: who is this kit for?
• What is included and technical specifications
• Do vertical panels produce less power?
• How much electricity and money could it save?
• Is your home ready? Setup and permissions
• Certifications, warranty and limitations
• Frequently asked questions
• The next step

Bottom line: who is this kit for?

This kit is for renters or homeowners who want a simple, lower-cost way to start with plug-in solar and have room for one unfolded panel in direct sun. Set the panel up on a flat, open spot such as a balcony, patio or open ground, with room to prop it up on its case. A sunny balcony is simply one possible spot, with the panel laid flat on the floor or propped on its kickstand. One panel makes a smaller dent in your bill than a larger kit, so think of it as a starting point.

Before choosing it, check the space, circuit, property permissions and utility requirements. The kit generates power while the sun is shining; it does not replace your utility service.

What is included and technical specifications

Our current kit listing includes one 400W foldable panel, one case/kickstand, two solar connection cables, 4 snap hooks, one STREAM microinverter with mounting hardware, and an AC connection cable. Monitoring is through the EcoFlow app. A battery and an export-control meter are not listed as included.

Specification	Value
Rated solar capacity (DC)	400W total: 1 x 400W panel
Panel rating, each	400W, +/-10W, at standard test conditions
Panel operating voltage/current	41V / 9.8A at maximum power
Panel open-circuit voltage / short-circuit current	48V / 11A
Panel cells / connection	Monocrystalline silicon; MC4-compatible connection
Microinverter model	EcoFlow STREAM EF-PS-1200 (North America)
Microinverter rating	1,200W maximum; 120V; 60Hz; maximum 10A (this kit's panels supply 400W of that)
Default feed-in power	360W by default; can be raised in the EcoFlow app with a matching electrical setup
Solar tracking / inputs	3 MPPTs, 4 pairs of PV terminals; PV2 and PV3 share an MPPT
MPPT range / maximum input voltage	16-60V / 60V
Maximum input current	3 x 14A; short-circuit limit 3 x 20A
Panel efficiency	22.6% efficiency
Panel dimensions / weight	Unfolded 41.7 x 93.1 x 1.0 in; folded 41.7 x 24.4 x 1.0 in; about 35.3 lb
Microinverter size / weight	12.2 x 9.3 x 1.4 in; 11 lb
Microinverter weather rating	NEMA 6; still follow sheltered-placement instructions
Microinverter operating temperature	-40 to 149 F (-40 to 65 C)
Connectivity / monitoring	WLAN and Bluetooth; EcoFlow app; install the EcoFlow app and connect the device to the app

Table sources: EcoFlow STREAM Microinverter data sheet and EcoFlow 400W panel data sheet

Do vertical panels produce less power?

They can. Panels collect the most direct sunlight when the sun's rays hit their surface square-on. A fully vertical panel may miss more of the high midday sun than a panel tilted toward it. Where the approved mounting method allows, adjust the angle toward the sun and keep the whole panel out of shade.

There is no single percentage penalty for vertical placement. The difference depends on where you live, which way the panel face, the season, shade and the time of day. Independent studies put rough numbers on this: at US latitudes, modeling estimates a fully vertical panel makes about 60 to 80 percent of the energy of a well-tilted one, and a year-long outdoor test measured 44 percent less in May but slightly more in January. Vertical panels can suit a low winter sun; tilting is not automatically better at every hour. Even well-positioned panels will not continuously produce their full rated 400W. EcoFlow says a 400W panel facing the sun square-on on a clear day usually makes about 320W to 350W. Heat is part of that gap: the panel's power temperature coefficient is about minus 0.39 percent per degree Celsius, and EcoFlow's manual says summer surface temperatures near 140 F (60 C) trim nominal power by about 13 percent.

EcoFlow recommends aiming the panel perpendicular to sunlight. The panel manual says the case can prop the panel up at 40 to 80 degrees, and for the best results it suggests using the kickstand before 10:00 am or after 2:00 pm and laying the panel flat around midday. If you would rather set the panel up once and leave it, that works too: keep it on the kickstand, or simply lay it flat on a balcony, patio or the ground, and it will still produce power, just less than a panel that follows the sun through the day. The manual also says a difference of up to 10 degrees from square-on has little effect. A panel standing fully vertical is steeper than the kickstand range and may not reach its full output, so tilt it back when you can. Do not add a tilt bracket EcoFlow has not approved.

How much electricity and money could it save?

The 400W rating is power under standard test conditions, not a promise of constant output. Sunshine, shade, temperature and panel angle change production. The inverter also has an output setting. EcoFlow sets it to 360W by default. EcoFlow says a 400W panel facing the sun on a clear day usually makes about 320W to 350W, so on those figures the default setting rarely holds anything back for this kit. EcoFlow says the setting has to match your electrical setup, so make sure your system is on a dedicated circuit before you change it.

Watts describe power at one moment. Kilowatt-hours, or kWh, describe electricity over time and are the units on your electric bill. A useful estimate needs your location, panel direction and angle, shade, inverter limit, electricity rate, and how much solar electricity your home uses as it is produced.

Related: our plug-in solar glossary

A simple way to estimate daily production: multiply the kit's 0.4kW solar capacity by your location's peak sun hours, then subtract real-world losses. At 4.5 peak sun hours (the US average), that's about 1.8kWh per day before losses; heat, wiring, conversion and panel angle together typically take off roughly 10 to 15 percent. Sunshine and shade are the biggest variables.

A worked example:

• Location: Mid-Atlantic yard, about 4.5 peak sun hours on an average day, south-facing, panel on the kickstand, no significant shade
• Output setting: default 360W
• Production: 0.4kW x 4.5 hours = 1.8kWh per day, minus about 15% real-world losses = about 1.5kWh per day, or about 46kWh per month
• Compared with the average bill (Maryland): Maryland's average electric rate is $0.2141/kWh (EIA, July 2026) and its average home uses 929kWh for a bill of about $198.86 per month. If your home uses all 46kWh as it is produced, 46kWh x $0.2141 = about $9.85 per month (about $118 per year). That's about 5% of the average Maryland electric bill ($9.85 / $198.86).

The same math at different sun and rate levels, with real state examples:

• Lower sun, lower rate (Washington): about 36kWh per month at $0.147/kWh = about $5.29 per month or $63 per year (3.5 peak sun hours). That's about 4% of Washington's average electric bill ($5.29 / $140.55 per month, based on 955kWh average use at $0.147/kWh).
• Higher sun, higher rate (California): about 61kWh per month at $0.336/kWh = about $20.50 per month or $246 per year (6 peak sun hours). That's about 12% of California's average electric bill ($20.50 / $169.13 per month, based on 503kWh average use at $0.336/kWh).

State rates are from EIA's Electric Power Monthly, Table 5.6.A (July 2026); average bills and usage are from ElectricityPlans' state-by-state EIA data (July 2026). These are modeled estimates with chosen assumptions. Your number depends on your sun, your rate, your placement and shading, the output setting, and how much of the daytime production your home actually uses.

Do not assume that exported power earns a credit or that every meter handles it the same way. Check our state tracker or ask your utility how it will measure and bill your setup, including any required approval or notification. This kit is not zero-export on its own.

Is your home ready? Setup and permissions

• A sunny, unshaded space for one unfolded panel in a safe, secure placement.
• A suitable outdoor outlet on a dedicated circuit, with proper grounding and GFCI protection.
• A sheltered, ventilated microinverter location, protected from direct sun, rain and snow.
• A cable route that matches the included connector length and does not require a power strip.
• Any required landlord or HOA permission if needed, plus state, local and utility checks.
• Confirmation that your meter and billing are suitable for grid-connected solar.

At a high level: choose the panel placement, mount the microinverter as directed, connect the panel as the STREAM instructions describe, plug in to the outlet, and install the EcoFlow app and connect the device to the app. Do not use the portable power station series-wiring diagram from the panel manual for this grid-connected installation. Use the STREAM microinverter installation instructions.

Have a qualified electrician assess any circuit changes, new outlet work or uncertainty about your setup. Do not raise the app limit if you install the kit on a shared circuit. If you move the kit, recheck the electrical requirements at the new location.

How to check a dedicated circuit

GFCI outlets and plug-in solar

Plug-in solar rules by state

Certifications, warranty and limitations

EcoFlow describes the STREAM microinverter as UL 1741 and UL 3700 certified, which includes anti-islanding, output-overcurrent and output-overvoltage protection. Those certification claims are for the microinverter, not the system as a whole.

Panels have a 12-month warranty; the STREAM microinverter has a 10-year warranty with the manufacturer. These are component terms, not a single warranty for the whole kit.

Weather resistance does not replace installation instructions. The inverter has a NEMA 6 rating, but EcoFlow still says to protect it from direct sun, rain and snow as much as possible. The panel manuals warn not to immerse the junction box or connection points in water.

What plug-in solar certification labels mean

Frequently asked questions

Will this cover my whole electricity bill?

It is designed to offset a portion of daytime electricity use. Your savings depend on your site, output setting, household use and electricity tariff. It does not eliminate utility service or fixed charges.

Can I tilt the panel instead of keeping it vertical?

Yes. Fully vertical panels may not reach full capacity, so tilting at an angle is better when you can. EcoFlow's case kickstand holds the panel at 40 to 80 degrees. The goal is sunlight hitting the panel square-on, and there is no single best angle for every site and season.

What happens on cloudy days or in shade?

Output falls when less sunlight reaches the panels. Keep panels clear of railing shadows and other obstructions. Separate MPPT inputs help manage separate panel inputs, but they do not make shade harmless or guarantee full output.

Does it work during a blackout or include a battery?

No. There is no battery in this kit, and the grid-connected microinverter stops output during a blackout. Do not buy this kit as emergency backup power.

Can I add an EcoFlow portable power station?

This kit has no battery or storage. The STREAM microinverter is compatible with STREAM Ultra, sold separately, which can be used with it for more solar power. Do not assume other EcoFlow batteries or portable power stations will work with it.

Do I need a permit, utility approval or a new meter?

That depends on your location and utility. Check before buying or installing. Ask the utility specifically about export, meter compatibility, and billing.

Why does the app say 360W?

EcoFlow sets the default feed-in power to 360W, which lets the unit run from a standard household circuit. Based on EcoFlow's figures, one 400W panel usually peaks near that level on a clear day, so most people will not need to change it.

Can I move it or expand it later?

The panel folds for storage and transport. Recheck approved placement, electrical requirements and local rules when you move. The STREAM microinverter has four panel terminals, so you can add panels later, up to four panels total. Check the electrical requirements and the output setting before you do. Note that the microinverter's maximum output at a given moment remains at 1,200W.

The next step

If you have a sunny space and want a foldable panel rather than a rooftop installation, explore our 400W EcoFlow kit. Not sure about panel placement, your outlet or your meter? Ask us before you order.

View the EcoFlow 400W kit