What Does This Error Mean?

EcoFlow solar charging not working is almost always a voltage mismatch — the panel's open-circuit voltage (Voc) is outside the EcoFlow model's MPPT input range. Check your panel's Voc on the label and compare it to EcoFlow's spec (typically 12–60V for RIVER, up to 150V for DELTA Pro).

Affected Models

EcoFlow DELTA
EcoFlow DELTA 2
EcoFlow DELTA Pro
EcoFlow RIVER
EcoFlow RIVER 2
EcoFlow RIVER Pro

Common Causes

Panel Voc too low — underperforming or shaded panels below MPPT minimum
Panel Voc too high — exceeds MPPT maximum for the EcoFlow model
MC4 connector not fully clicked in — partial contact, no current flow
Panels in shade or partial cloud cover — output drops below charging threshold
Wrong polarity on the solar cable — positive and negative wires swapped
Faulty solar adapter cable between panel and EcoFlow charging port

How to Fix It

Check the panel's open-circuit voltage (Voc).

Find the Voc value on the panel's label (usually on the back). Compare it to your EcoFlow model's solar input spec in the manual. Example: DELTA 2 accepts 11–60V; DELTA Pro accepts 11–150V. A single 100W panel with Voc of 21V is fine; two panels in series at 42V is also fine, but three at 63V would exceed the DELTA 2 limit.
Verify the MC4 connectors are fully seated.

MC4 connectors require a firm push until you hear a click. A partially inserted connector will pass no current. Disconnect and reconnect both the positive and negative MC4 connectors with firm pressure.
Point panels directly at the sun and remove obstructions.

Solar panels need direct, unshaded sunlight to reach the MPPT minimum input threshold. Even partial shade on one cell can drop output dramatically. Tilt the panel perpendicular to the sun's angle for maximum output.
Check cable polarity.

The positive (red or marked +) cable from the panel must connect to the positive MC4 on the EcoFlow adapter. If the polarity is reversed, the MPPT controller will not accept input and may display 0W. Disconnect and reverse the connectors if you are unsure.
Test with a different cable or panel.

If another solar panel of the correct Voc charges the EcoFlow normally, your original cable or panel has a fault. Faulty MC4 adapters are a common failure point — replace the cable before assuming the EcoFlow unit is faulty.

When to Call a Professional

If the solar input port shows 0W even with full sun, correct Voc, and a known-good cable, the MPPT charge controller may have failed. Contact EcoFlow support.