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EcoFlow•Delta Pro

Analysis by Marcus & Team

EcoFlow Delta Pro Discharging While Plugged Into AC

Troubleshoot EcoFlow Delta Pro discharging while plugged into AC power. Diagnose battery drain, inverter malfunction, and phantom loads in residential solar+storage systems.

Frequently Asked Questions

•What should I do if the EcoFlow app shows a fault code?

Consult the EcoFlow user manual or website for a list of fault codes and their meanings. Contact EcoFlow support for assistance.

•Can I use a third-party charger with my EcoFlow Delta Pro?

No, only use the charger provided by EcoFlow or a charger specifically approved by EcoFlow. Using an incompatible charger could damage the unit or create a safety hazard.

•How do I properly dispose of an EcoFlow Delta Pro battery?

Do not dispose of the battery in the trash. Contact your local recycling center or EcoFlow for proper disposal instructions.

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Marcus leads the technical research department at Storage Faults. Together with a team of systems analysts, he specializes in translating complex solar storage error codes into actionable diagnostic steps for the US market.

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What to Look For:

The EcoFlow Delta Pro portable power station is observed discharging its battery even while connected to a live AC power source. The unit should be charging or in pass-through mode, but instead, the SOC is decreasing.

Important Warnings:

The EcoFlow Delta Pro contains high DC voltage. Never attempt to open or repair the unit yourself. Improper handling can result in electric shock, fire, or explosion. Always disconnect the AC power source before performing any inspection. If the unit is smoking, swelling, or emitting unusual odors, immediately move it to a safe outdoor location and contact emergency services.

Step-by-Step Fix:

1

Verify AC power source: Use a multimeter to confirm the AC outlet provides the correct voltage (e.g., 120V, 60Hz in North America) and is properly grounded.
2

Inspect AC input cable and connector: Check for damage or loose connections. Try a different AC cable.
3

Check EcoFlow app for charging status and error messages: The app may provide diagnostic information.
4

Measure AC input current with a clamp meter: Verify the unit is drawing current from the AC source. If the current is very low or zero, it indicates a charging problem.
5

Disconnect all loads: Unplug any devices connected to the Delta Pro to eliminate the possibility of excessive parasitic loads.
6

Monitor battery SOC with no load and AC connected for at least 1 hour. If discharging continues, the charging circuit is likely faulty.
7

Contact EcoFlow support for warranty service or repair. Do not attempt to disassemble the unit yourself.

Expert Tip:

Check the EcoFlow app's advanced settings for any adjustable charging parameters, such as charging speed or AC input voltage range. Incorrect settings could prevent the unit from charging properly. A full reset via the app (if available) may also resolve software glitches.

How It Works:

The EcoFlow Delta Pro contains an internal inverter, battery management system (BMS), and charging circuitry. When connected to AC, the AC input should power the inverter directly (pass-through) or charge the battery via an AC-DC converter. The BMS monitors cell voltages, temperature, and current, and controls charging and discharging. An unexpected discharge suggests an issue with the AC input detection, the charging circuit, or excessive parasitic loads exceeding the charge rate.

Possible Causes:

Faulty AC input detection: The unit might not be correctly sensing the presence of AC power.
Defective AC-DC charging circuit: The charging circuit is unable to convert AC to DC for battery charging.
High parasitic loads: Internal components or connected devices drawing more power than the charging circuit can provide.
BMS malfunction: The BMS is incorrectly reporting SOC or controlling charge/discharge behavior.
Firmware bug: Software error causing incorrect power management.
Damaged battery cells: Reduced battery capacity leads to faster discharge rates even with some charging.

Prevention:

Keep the unit clean and free of dust.
Perform regular capacity tests by fully charging and discharging the battery.
Update the firmware to the latest version via the EcoFlow app.
Avoid operating the unit in extreme temperatures.
Store the unit with a SOC between 50% and 80% when not in use for extended periods.