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Analysis by Marcus & Team

SolarEdge Battery Not Charging from Solar During Outage

Troubleshoot why your SolarEdge battery isn't charging from solar during a power outage. Find diagnostic steps and safety information for residential systems.

Frequently Asked Questions

•What is the typical DC voltage I should expect from my solar panels during peak sunlight?

The DC voltage depends on the number of panels in series (string voltage). Consult your system design documents for the expected voltage. Use a multimeter to measure string voltage at the inverter DC input terminals (with appropriate PPE).

•How do I clean my solar panels safely?

Use a soft brush and water. Avoid harsh chemicals or abrasive cleaners. Early morning or late evening is best to avoid thermal stress on the panels. Ensure you are following all safety guidelines when working at heights.

•How often should I have my SolarEdge system professionally inspected?

A professional inspection is recommended every 3-5 years, or more frequently if you notice any performance issues.

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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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Technical Background:

SolarEdge hybrid inverters manage power flow between solar panels, battery, grid, and loads. During an outage, the inverter isolates from the grid (anti-islanding) and creates a microgrid powered by the battery and solar. The inverter's MPPT (Maximum Power Point Tracking) algorithm optimizes solar power extraction. The DC/DC converter regulates voltage for battery charging. A failure in any of these components can prevent charging. The Energy Storage System (ESS) requires properly configured AC Coupling or DC Coupling. Rapid Shutdown (RSD) per NEC 2017/2020 must function correctly.

Symptoms:

During a grid outage, the SolarEdge battery is not charging from the solar panels, despite sufficient solar irradiance. The inverter may indicate a fault, or show no charging current to the battery. Battery state of charge (SOC) may remain static or decrease.

Possible Causes:

Incorrect inverter configuration for backup operation. Backup settings may be disabled or improperly configured in the SolarEdge monitoring portal.
DC disconnect switch is open, preventing solar power from reaching the inverter.
Communication failure between the inverter and the battery management system (BMS), preventing proper charging control.
Firmware issue in the inverter or battery, affecting charging algorithms.
Faulty DC/DC converter within the inverter, preventing power conversion for battery charging.
Insufficient solar irradiance to meet minimum charging requirements of the battery.

Solution:

1

*Safety First:** Verify the AC disconnect is open and the DC disconnect is open before inspecting any wiring. Follow all NEC rapid shutdown procedures. A qualified electrician is required.
2

*Check Inverter Configuration:** Use the SolarEdge monitoring portal or SetApp to verify that the backup power function is enabled and correctly configured. Ensure the battery charge settings are appropriate.
3

*Verify DC Disconnect Switch:** Ensure the DC disconnect switch is closed, allowing solar power to flow to the inverter. Use a multimeter to verify voltage at the inverter DC input terminals (with appropriate PPE).
4

*Inspect Communication Cables:** Check the communication cables between the inverter and battery for damage or loose connections. Use a multimeter to test continuity of the communication wires.
5

*Check Firmware Versions:** Verify that both the inverter and battery have the latest firmware versions installed. Use the SolarEdge monitoring portal or SetApp to update firmware if necessary.
6

*Monitor Solar Irradiance:** Ensure adequate sunlight is reaching the solar panels. Shading or soiling can significantly reduce power output. A clamp meter can measure DC current from each string.
7

*Qualified Technician Required:** If the above steps do not resolve the issue, contact a qualified SolarEdge technician to diagnose and repair any internal inverter or battery faults.

Safety Warning:

SolarEdge systems operate at high DC voltages (up to 600V+). Arc flash hazards are present. Never work on live circuits. Always disconnect AC and DC power sources before performing any maintenance or troubleshooting. NEC rapid shutdown requirements must be followed. Only qualified electricians should perform repairs.

Prevention:

• Regularly monitor system performance through the SolarEdge monitoring portal.
• Schedule periodic licensed technician inspections of the system, including battery capacity testing and thermal imaging of connections.
• Keep the solar panels clean to maximize solar irradiance.
• Ensure the inverter and battery firmware are always up to date.
• Check DC disconnect switch functionality annually.

Expert Tip:

Use the SolarEdge SetApp service menu to access advanced diagnostic information, including battery voltage, current, temperature, and state of charge (SOC). The service menu also allows for manual charging commands and error code resets. Note: Access to the service menu requires installer-level credentials.