Victron Energy Solar Charge Controller: “Err 1”
warning RV solar charge controller error codes
What it means
Battery temperature too high. The charge controller has stopped charging because the battery temperature it is reading (via a connected temperature sensor or a Smart Battery Sense / VE.Smart network) is above the safe limit.
Most likely causes
- Battery genuinely too hot (poor ventilation, hot ambient, hard charging) common
- Temperature sensor reading is wrong or sensor/wiring fault less common
Safe checks you can do yourself
- Confirm the battery bank is hot to the touch and improve ventilation/airflow around it
- Check the temperature sensor (Smart Battery Sense or T-sense) is mounted on the battery and wired correctly
- Let the bank cool; the error auto-resets once temperature drops to a safe value
How to reset / clear Err 1
- No manual reset needed: the controller resumes charging automatically after the battery temperature falls back into range
When to call a technician
The error persists when the battery is clearly cool, suggesting a defective temperature sensor or controller.
Applies to
SmartSolar MPPT (all) · BlueSolar MPPT (all)
FAQ
What does Victron Energy Solar Charge Controller code "Err 1" mean?
Battery temperature too high. The charge controller has stopped charging because the battery temperature it is reading (via a connected temperature sensor or a Smart Battery Sense / VE.Smart network) is above the safe limit.
How do I reset Victron Energy Solar Charge Controller Err 1?
No manual reset needed: the controller resumes charging automatically after the battery temperature falls back into range
What is the most common cause of Err 1 on a Victron Energy Solar Charge Controller?
The most likely cause is battery genuinely too hot (poor ventilation, hot ambient, hard charging).
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Sources
- MPPT Solar Charger Error Codes — Err 1 — Battery temperature too high (Victron Energy)
Note: Title and behavior confirmed on the official Victron error-code page. A widely copied third-party page mislabels Err 1 as a battery-voltage-setting problem; that is incorrect.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.