LVTS-5220-HVX high-voltage battery - BMS alarm page on the battery touchscreen (LVTOPSUN BMS protection alarms)
LVTopsun Dsg Cell Ud_V error code
A cell fell below the BMS discharge under-voltage limit.
Likely causes
- Deep discharge of the pack
- Weak or ageing cell reaching cut-off first
- Large cell imbalance
- Discharge current too high for the pack temperature
Checks to run, in order
- 1Read the lowest cell and the pack SOC on the touchscreen
- 2Check the inverter low-DC cut-off and discharge depth settings
- 3Compare the low cell with the rest of the pack
- 4Check the load current against the datasheet limit
Fixes
- Stop discharge and recharge the pack
- Raise the low-DC cut-off so the pack keeps a reserve
- Reduce the discharge current or load
When to escalate
If one cell hits cut-off well before the others, ask the distributor to capacity-test the 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 Dsg Cell Ud_V mean?
A cell fell below the BMS discharge under-voltage limit.
How do I fix LVTopsun Dsg Cell Ud_V?
Stop discharge and recharge the pack Raise the low-DC cut-off so the pack keeps a reserve Reduce the discharge current or load
When should I escalate LVTopsun Dsg Cell Ud_V?
If one cell hits cut-off well before the others, ask the distributor to capacity-test the module.
Can I reset LVTopsun Dsg Cell Ud_V myself?
Only after isolating the AC and DC sides and running the checks above. If LVTopsun Dsg Cell Ud_V returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show LVTopsun Dsg Cell Ud_V?
LVTopsun Dsg Cell Ud_V 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_TThe temperature difference between BMS sensors exceeded the 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.
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