EPEVER Solar Charge Controller: “Battery red solid — over-discharged”
warning RV solar charge controller error codes
What it means
A steady red battery indicator means the battery is over-discharged: voltage has dropped to the Low Voltage Disconnect point, so the controller has cut its load output to protect the battery.
Most likely causes
- Loads drew the battery down faster than the panels could recharge it (undersized array or several cloudy days) most likely
- Battery aged or undersized for the load demand common
- Little or no PV charging (shading, disconnected/dirty panels) over an extended period common
Safe checks you can do yourself
- Measure battery voltage; it should be at or below the Low Voltage Disconnect setting
- Check that the PV is charging during daylight (charging indicator should show charging)
- Review your daily load vs. available solar — reduce loads or add panel/battery capacity if chronically undersized
How to reset / clear Battery red solid — over-discharged
- Allow the battery to recharge (via solar, or an external charger) until voltage rises to or above the Low Voltage Reconnect (LVR) point
- The controller-connected load output recovers automatically once LVR is reached
When to call a technician
If the battery will not hold charge or voltage collapses immediately under load after recharging, the battery is likely failed — have it tested/replaced.
Applies to
EPEVER Triron N series · EPEVER Tracer-AN series · EPEVER Tracer-BN/BP series
FAQ
What does EPEVER Solar Charge Controller code "Battery red solid — over-discharged" mean?
A steady red battery indicator means the battery is over-discharged: voltage has dropped to the Low Voltage Disconnect point, so the controller has cut its load output to protect the battery.
How do I reset EPEVER Solar Charge Controller Battery red solid — over-discharged?
Allow the battery to recharge (via solar, or an external charger) until voltage rises to or above the Low Voltage Reconnect (LVR) point The controller-connected load output recovers automatically once LVR is reached
What is the most common cause of Battery red solid — over-discharged on a EPEVER Solar Charge Controller?
The most likely cause is loads drew the battery down faster than the panels could recharge it (undersized array or several cloudy days).
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Sources
- EPEVER TRIRON N Series Modular MPPT Solar Charge Controller User Manual — TRIRON-SMS-EL-V1.2, Section 4.1 — Battery LED Red On Solid = Over discharged; Section 6.2 Troubleshooting (Battery over discharged, recover at LVR) (EPEVER (Huizhou EPEVER Technology Co., Ltd.))
- MPPT Solar Charge Controller User Manual, Tracer-AN series — Tracer-AN-Manual-EN-V2.6, Section 4.2 Troubleshooting — Battery over discharged: load recovers at/above LVR (EPEVER (Huizhou EPEVER Technology Co., Ltd.))
Note: Loads wired directly to the battery (not through the controller load terminals) are not disconnected and can continue to drain the battery.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.