Trying to pair solar panels with your EcoFlow station and hitting a wall of conflicting specs? You're not alone. EcoFlow publishes the numbers, but they're scattered across a dozen product pages. This reference consolidates every current model's solar input specs in one place: max watts, voltage range, and max current.
Whether you're shopping for a first setup, adding panels to a station you already own, or trying to figure out why charging stopped, the numbers below are what you need. According to EcoFlow official specifications, these figures are published as of March 2026.
The table below covers the full current lineup. Models are grouped by series. Each row shows the three numbers that control solar panel compatibility: max input wattage, the voltage window your panels must stay within, and the maximum current the port accepts.
EcoFlow Solar Input Specs: Complete Reference (2026)
| Model | Capacity | Max Solar Input | Voltage Range | Max Current |
|---|---|---|---|---|
| RIVER 2 | 256Wh | 110W | 11–30V | 8A |
| RIVER 2 Max | 512Wh | 220W | 11–30V | 13A |
| RIVER 2 Pro | 768Wh | 220W | 11–30V | 13A |
| RIVER 3 | 245Wh | 200W | 11–30V | 8A |
| RIVER 3 Plus | 500Wh | 220W | 11–30V | 13A |
| DELTA 2 | 1,024Wh | 500W | 11–60V | 13A |
| DELTA 2 Max | 2,048Wh | 1,000W | 11–60V | 15A |
| DELTA 3 1500 | 1,536Wh | 800W | 11–60V | 15A |
| DELTA 3 Plus | 1,024Wh | 800W | 11–60V | 15A |
| DELTA 3 Air | 1,024Wh | 800W | 11–60V | 15A |
| DELTA Pro | 3,600Wh | 1,600W | 11–150V | 15A |
| DELTA Pro 3 | 4,096Wh | 3,600W | 15–150V | 30A |
Source: EcoFlow published specifications, March 2026. Verify at us.ecoflow.com before purchase.
EcoFlow DELTA 2
$399.00
- 500W max solar input (11–60V, up to 13A)
- 1,024Wh LFP battery, 1,800W AC output
- 5-year warranty, X-Boost technology
RIVER Series: Solar Input Specs at a Glance
The RIVER lineup covers five models, all sharing the same 11–30V voltage window. That narrow voltage range is the defining constraint: it limits you to lower-wattage panels or a single panel at a time. What changes between models is the wattage ceiling and, in the case of the RIVER 2, the maximum current.
RIVER 2 and RIVER 2 Max: Entry-Level Limits
The RIVER 2 sits at the bottom of the solar input hierarchy with a 110W cap and 8A max current. One 100W panel is the practical match. Go above 110W and the MPPT controller simply stops drawing the excess: no damage, but no benefit either.
Step up to the RIVER 2 Max (512Wh) and the input doubles to 220W, with current rising to 13A. Two 100W panels in parallel or a single 220W panel both work cleanly. The voltage ceiling stays at 30V, which rules out series wiring of standard residential panels.
RIVER 2 Pro and RIVER 3 Plus: 220W Sweet Spot
The RIVER 2 Pro (768Wh) and RIVER 3 Plus (500Wh) share the same 220W / 11–30V / 13A solar input spec. At their respective capacity levels, 220W is a sensible ceiling. A 220W panel paired with clear-sky conditions can charge the RIVER 2 Pro from flat in roughly four to five hours, based on the station's 768Wh capacity and standard conversion losses.
The RIVER 3 (245Wh) falls in between at 200W, still within the 11–30V window. The 10W difference from the RIVER 3 Plus is minor in practice: a single 200W panel is the practical match for both.
For panel recommendations that match these specs, the EcoFlow DELTA 2 solar setup guide covers compatible wattages and connection configs in detail.
DELTA 2 and DELTA 3 Series: Mid-Range Solar Capability
Moving into the DELTA lineup means a meaningful jump in both solar input and voltage headroom. The voltage window expands from 30V to 60V, which opens up series panel wiring. The wattage ceiling climbs from 220W to 500W on the DELTA 2 and 800W across the DELTA 3 family.
DELTA 2: 500W Input, 60V Voltage Window
The DELTA 2 (1,024Wh) accepts up to 500W at 11–60V with a 13A current limit. That 60V ceiling changes the wiring math significantly. Two 220W panels connected in series will show an open-circuit voltage (Voc) around 50–52V under standard conditions, which sits comfortably within the 60V limit.
A series connection is often preferable to parallel in real-world conditions: higher voltage means less current loss over cable runs, and charging can begin at lower light levels than a parallel setup of the same wattage. The DELTA 2 at $399 is the entry point where solar wiring becomes genuinely flexible.
DELTA 3 Series: 800W Input Across All Models
The DELTA 3 generation standardizes at 800W / 11–60V / 15A across all three variants: the DELTA 3 Plus (1,024Wh), the DELTA 3 1500 (1,536Wh), and the DELTA 3 Air (1,024Wh). All three share the same solar input ceiling despite having different battery capacities. The practical consequence: the 1,536Wh DELTA 3 1500 paired with an 800W array will take roughly twice as long to charge fully as the 1,024Wh models.
The 15A current limit on the DELTA 3 series (vs. 13A on the DELTA 2) creates slightly more room for parallel panel configurations. Four 200W panels in a 2S2P arrangement (two strings of two in parallel) stay within both the voltage and current limits.
EcoFlow DELTA 3 Plus
$599.00 $799.00
800W solar input, 5 charging methods, 5-year warranty
To estimate actual charge times based on your panel and conditions, use the solar charge time calculator. The math applies across all brands.
DELTA 2 Max and DELTA Pro: High-Input Territory
DELTA 2 Max: 1,000W Input, Two Full Arrays
The DELTA 2 Max (2,048Wh) doubles the DELTA 2's solar ceiling to 1,000W. The voltage window remains 11–60V, but current increases to 15A. That current limit is what shapes the array configuration: four 220W panels in a 2S2P arrangement (two pairs, each pair wired in series) stays within both the 60V voltage cap and the 15A current limit while delivering close to the full 880W.
Analysis of the DELTA 2 Max's specs shows this is the first EcoFlow model where a full off-grid solar setup for daily use becomes practical. With 2,048Wh of capacity and 1,000W of input, a clear-sky charge from flat takes around two to three hours.
DELTA Pro: 1,600W and 150V Ceiling
The DELTA Pro (3,600Wh) introduces a spec that separates it from every model below: a 150V maximum voltage. That ceiling is the key difference. It makes the DELTA Pro compatible with high-voltage residential solar panels that would exceed the 60V limit of the DELTA 2 series.
With a 1,600W input cap and 15A current limit, the DELTA Pro can accept up to four 400W panels in series (Voc typically around 48–52V each, combined around 144–156V (stay below 150V)). Whether you're stacking panels for more voltage or paralleling for more current, the series vs parallel solar panel wiring guide covers the wiring math and what each topology does to your input figures.
DELTA Pro 3: The 3,600W Exception
The DELTA Pro 3 (4,096Wh) is in a category of its own. Its solar input ceiling of 3,600W is more than double the DELTA Pro's 1,600W and roughly ten times the RIVER series top end. No other EcoFlow station comes close. This is the model built for permanent solar installations, not portable setups.
Published specs confirm an input window of 15–150V with a 30A maximum current. That 30A ceiling is the other headline figure: it's double the 15A limit found across the rest of the lineup, which fundamentally changes what parallel configurations are possible. See the full specs on the DELTA Pro 3 product page.
What 3,600W Solar Input Actually Means in Practice
To reach the 3,600W ceiling, you'd need approximately nine 400W panels, or six 600W commercial-grade rigid panels. For most residential setups, this means the DELTA Pro 3 can absorb the full output of a small rooftop array without any clipping.
Owner data and spec analysis consistently show that real-world input sits below the rated ceiling due to angle, shading, and temperature derating. A six-panel 400W array delivering 70–80% efficiency still produces 1,680–1,920W of actual input, which charges the 4,096Wh battery from flat in roughly two to two-and-a-half hours.
Voltage Window: 15–150V on the DELTA Pro 3
One spec worth flagging: the DELTA Pro 3's minimum voltage is 15V, compared to 11V on all other EcoFlow models. This is a minor difference in most setups, but it means very-low-voltage panels (under 15V Voc) will not trigger charging. Standard 12V nominal panels with a Voc around 18–21V are fine. The 150V maximum is identical to the original DELTA Pro.
If solar input is one piece of the capacity puzzle, EcoFlow battery expansion options covers the other: which add-on batteries connect to which models.
EcoFlow Extra Battery Guide: Compatibility Chart for Every Model
Which add-on batteries work with which stations
Understanding the Numbers: Watts, Volts, and Amps Explained
Three numbers appear in every EcoFlow solar input spec. Each one controls a different aspect of panel compatibility. Getting all three right is what makes a setup work. Getting one wrong means either no charging or potential hardware damage.
Max Watts: The Total Panel Ceiling
Max wattage is the soft ceiling on total panel output. The MPPT charge controller (which manages the solar input on every EcoFlow station) simply caps the draw at the rated maximum. Connecting a 600W array to a 500W-rated station doesn't damage anything: the extra 100W of panel capacity goes unused.
In practice, mild oversizing (10–20% above the station's rated input) is a common approach to compensate for real-world efficiency losses. A 550W or 600W array with a 500W-rated DELTA 2, for example, is a reasonable configuration in overcast climates.
Voltage Range: Why It Controls Panel Wiring
The voltage range is the hard limit. Your panel array's open-circuit voltage (Voc) must stay within the station's published min and max at all times. Exceed the maximum and you risk damaging the charge controller. Fall below the minimum and charging simply won't start.
This is why the voltage window matters more than wattage when selecting panels. Wiring panels in series increases voltage; wiring in parallel increases current. The voltage ceiling of your station determines how many panels you can put in series before exceeding the safe limit.
Max Amps: The Parallel Connection Limit
The maximum current rating governs how many panels can be wired in parallel. Connecting more amperage than the port's rated maximum won't increase charge speed: the station will only draw up to its rated current. The excess capacity is unused, not absorbed. This limit becomes relevant when designing larger arrays with multiple parallel strings.
Reading Solar Input Specs: What Each Number Controls
MAX WATTS
The ceiling on total panel output the station will accept. Connecting panels above this figure does not break the unit. The MPPT controller simply caps the draw. Oversizing slightly (by 10-20%) is common practice to compensate for real-world losses.
VOLTAGE RANGE (V)
The open-circuit voltage (Voc) of your panel array must stay within these limits. Exceeding the maximum voltage can damage the charge controller. Falling below the minimum means the station will not start charging at all. This governs how panels can be wired in series.
MAX CURRENT (A)
The maximum amperage the input port can handle. This limits how many panels can be wired in parallel. Connecting more amps than this rating will not increase charge speed. The station will only draw up to its rated maximum.
EcoFlow Solar Input: Tier by Tier
Entry / Portable
110–220W
RIVER 2, RIVER 3, RIVER 2 Max, RIVER 2 Pro, RIVER 3 Plus
Mid-Range
500–800W
DELTA 2, DELTA 3 Plus, DELTA 3 1500, DELTA 3 Air
High-Capacity
1,000–1,600W
DELTA 2 Max, DELTA Pro
Powerhouse
3,600W
DELTA Pro 3
How to Match Panels to Your EcoFlow Station
Knowing the specs is one thing. Translating them into a working panel configuration is where the numbers become useful. Here's how the matching logic breaks down by station tier.
For RIVER Series Owners: Single 100–200W Panel Setups
The 30V voltage ceiling limits RIVER owners to panels with a Voc below 30V. Standard 12V nominal panels (Voc typically 18–22V) fit cleanly. Two panels in series would push Voc to 36–44V, which exceeds the limit. Parallel wiring of two panels keeps voltage in range but doubles current: check that your total current stays below the station's rated limit (8A for RIVER 2, 13A for others).
In practical terms, a single 200W panel is the most efficient match for RIVER 2 Max, RIVER 2 Pro, and RIVER 3 Plus owners. One panel, one cable, no wiring complexity.
For DELTA 2 and DELTA 3 Owners: Dual-Panel and Beyond
The 60V ceiling is where series wiring becomes practical. Two standard 220W panels in series (Voc per panel around 25–26V, combined 50–52V) fall comfortably within the DELTA 2's 60V limit. The DELTA 3 series, with its 800W ceiling and 15A current limit, can handle a 2S2P arrangement: two strings of two panels, each string in series, the two strings in parallel.
What does a 2S2P configuration look like in practice? Four 200W panels delivering up to 800W at around 50V, drawing roughly 16A before the 15A clamp takes effect. You'll see slightly less than 800W at the input port, closer to 750W real-world. That's still the highest consistent solar intake this tier offers.
For DELTA Pro and DELTA Pro 3: Multi-Array Planning
The DELTA Pro's 150V ceiling opens up high-voltage panel strings. Three 400W panels in series (Voc around 48–52V each, combined 144–156V) work if your specific panels' Voc stays below 150V. Verify the Voc on your panel's datasheet before wiring, since not all 400W panels are identical.
The DELTA Pro 3 at 30A and 150V provides the widest configuration window in the lineup. Multiple parallel strings, each within the voltage limit, can combine up to 30A total. Readers comparing EcoFlow's solar charging performance against competing brands will find the full breakdown in the best solar generators of 2026 roundup.
💡 Pro Tip: EcoFlow uses an XT60 connector on most RIVER and DELTA models. If your panels have MC4 connectors (standard on most third-party panels), you'll need an MC4-to-XT60 adapter cable. Verify connector type before purchasing panels.
Frequently Asked Questions
What is the maximum solar input for the EcoFlow DELTA 2?
The DELTA 2 accepts up to 500W of solar input with a voltage range of 11–60V and a maximum current of 13A. This means two 220W panels connected in series fall within spec, as their combined Voc typically sits around 50–52V under standard conditions. The 60V ceiling provides more wiring flexibility than the RIVER series, making the DELTA 2 a practical starting point for multi-panel setups.
Can I connect third-party solar panels to an EcoFlow station?
Yes, as long as the panel's open-circuit voltage (Voc) falls within the station's published voltage window and the wattage does not exceed its max solar input. EcoFlow uses an XT60 connector on most RIVER and DELTA models. A compatible XT60 adapter or cable is required for third-party panels with MC4 connectors, which is the standard on most residential panels. Verify both the Voc and connector type before purchasing.
What happens if my solar panels exceed the station's max wattage?
The MPPT charge controller caps the draw at the station's rated maximum. The excess panel capacity is simply unused (not absorbed, not harmful). Mild oversizing (10–20% above the station's rated input) is a common practice to compensate for real-world efficiency losses from panel angle, shading, and temperature. Pairing a 600W array with a 500W-rated DELTA 2, for example, is a reasonable configuration in less-than-ideal conditions.
Which EcoFlow model accepts the most solar input?
The DELTA Pro 3 leads the lineup at 3,600W max solar input with a 15–150V voltage window and up to 30A. This allows connection of up to nine 400W panels at once, making it the only EcoFlow station capable of fully absorbing the output of a small residential rooftop array. The next highest is the DELTA Pro at 1,600W, less than half the DELTA Pro 3's ceiling.
Why does the voltage range matter more than wattage for panel selection?
The voltage range defines the open-circuit voltage (Voc) limits within which the station's MPPT controller operates. Exceeding the maximum voltage can damage the controller or trigger protective shutdowns. Falling below the minimum means charging will not start at all. Wattage ceilings, by contrast, are soft limits: excess capacity is unused but not harmful. This is why voltage governs which panels can be wired in series and how many, while wattage simply sets a charging rate ceiling.
Do EcoFlow solar generators with the same wattage rating have identical solar input specs?
Not always. The DELTA 3 Plus and DELTA 3 1500 both accept 800W but have different battery capacities (1,024Wh vs 1,536Wh). A higher-capacity station paired with the same solar array will simply take longer to reach full charge. The voltage window and amperage limit can also vary between models with similar wattage ceilings, so always verify the full spec sheet before purchasing panels.
EcoFlow DELTA Pro 3
$1,999.00
Highest solar input in the lineup: up to 3,600W PV
Price verified March 2026. Free shipping available
Final Thoughts
EcoFlow's solar input specs follow a clear tiering pattern: RIVER models top out at 110–220W with a 30V ceiling, DELTA 2 and DELTA 3 series step into 500–800W territory with a 60V window, DELTA Pro moves to 1,600W and 150V, and the DELTA Pro 3 stands alone at 3,600W. Capacity and solar ceiling scale together, which makes model selection fairly straightforward once you know your target daily energy consumption.
The voltage window is the spec most people overlook. Max wattage sets your charging speed ceiling; voltage determines which panels can be wired in series. Get both right and your EcoFlow station will charge efficiently from whatever array you connect. Get the voltage wrong and you either get no charging (below minimum) or risk controller damage (above maximum).
The EcoFlow DELTA 2 solar setup guide goes deeper on specific panel recommendations and wiring diagrams for the mid-range models. For a full comparison of EcoFlow against competing brands on solar performance, the best solar generators of 2026 roundup covers the full field.
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Originally published: March 31, 2026