LVTS-5220-HVX high-voltage battery - BMS alarm page on the battery touchscreen (LVTOPSUN BMS protection alarms)
LVTopsun Chg Diff_T error code
The temperature difference between BMS sensors exceeded the limit during charge.
Likely causes
- Uneven airflow across the modules
- One module in a stack working harder than the others
- Sensor placement or sensor fault
- High charge current in a poorly ventilated cabinet
Checks to run, in order
- 1Read the Temp Info page and compare all sensors
- 2Check airflow and spacing around each module
- 3Compare module currents during charge
- 4Check sensor wiring is seated
Fixes
- Improve airflow so the modules see the same ambient
- Reduce the charge current
- Reseat the sensor connectors
When to escalate
If one sensor consistently differs from the rest with even airflow, ask the distributor to replace that sensor or module.
Fix it with the right tools
Check the system around the fault before replacing parts: load, battery bank, PV string and commissioning settings. If you need a second opinion, send the code and your inverter model to our team.
Before you open the inverter
- Isolate both the AC and DC sides, then confirm the display is dead before touching terminals.
- Use insulated tools and one hand where possible. DC arcs do not self-extinguish like AC.
- If you see burnt terminals, swollen cells, leaking electrolyte or a burning smell, stop and escalate instead of resetting the fault.
Questions installers ask
What does LVTopsun Chg Diff_T mean?
The temperature difference between BMS sensors exceeded the limit during charge.
How do I fix LVTopsun Chg Diff_T?
Improve airflow so the modules see the same ambient Reduce the charge current Reseat the sensor connectors
When should I escalate LVTopsun Chg Diff_T?
If one sensor consistently differs from the rest with even airflow, ask the distributor to replace that sensor or module.
Can I reset LVTopsun Chg Diff_T myself?
Only after isolating the AC and DC sides and running the checks above. If LVTopsun Chg Diff_T returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show LVTopsun Chg Diff_T?
LVTopsun Chg Diff_T is documented for LVTS-5220-HVX high-voltage battery - BMS alarm page on the battery touchscreen (LVTOPSUN BMS protection alarms). Confirm the code on your own unit's display or manual before ordering parts.
More LVTopsun error codes
- LVTopsun Ahesion FltThe BMS detected a main contactor or relay that has stuck closed (contact adhesion).
- LVTopsun Chg Bat Ov_VThe pack voltage rose above the BMS charge over-voltage limit.
- LVTopsun Chg Bat Ud_VPack voltage stayed below the BMS charge under-voltage limit while the pack was supposed to be charging.
- LVTopsun Chg Cell Ov_VCharging was stopped because a cell reached the BMS charge over-voltage limit.
- LVTopsun Chg Cell Ud_VA cell fell below the BMS charge under-voltage limit while the pack was being charged.
- LVTopsun Chg Diff_VThe voltage difference between the highest and lowest cell exceeded the BMS limit during charge.
Guidance reviewed 17 October 2026 by the Mishka Energy installer team. Error codes vary by brand, model family and firmware; confirm against the manufacturer manual.
Back to troubleshooting