LVTS-5220-HVX high-voltage battery - BMS alarm page on the battery touchscreen (LVTOPSUN BMS protection alarms)
LVTopsun Chg Cell Ov_V error code
Charging was stopped because a cell reached the BMS charge over-voltage limit.
Likely causes
- Cell imbalance - one cell reaches the limit before the rest of the pack
- Inverter or charger charge voltage set above the battery profile
- BMS cell-voltage sensing error
- Charging at low temperature, where the allowed cell voltage is lower
Checks to run, in order
- 1Open the battery touchscreen Cell page and record the highest and lowest cell voltage
- 2Compare the highest cell with the pack average and with the other modules in the stack
- 3Check the inverter charge voltage and selected CAN protocol against the LVTOPSUN battery profile
- 4Confirm the battery temperature is inside the charging window
Fixes
- Stop charging and let the BMS balance the pack
- Set the inverter charge voltage to the LVTOPSUN profile and restart charging
- If one cell stays at the limit after balancing, quarantine that module
When to escalate
If the same cell reaches the limit on every charge once the charge voltage and temperature are correct, ask the distributor to test that 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 Cell Ov_V mean?
Charging was stopped because a cell reached the BMS charge over-voltage limit.
How do I fix LVTopsun Chg Cell Ov_V?
Stop charging and let the BMS balance the pack Set the inverter charge voltage to the LVTOPSUN profile and restart charging If one cell stays at the limit after balancing, quarantine that module
When should I escalate LVTopsun Chg Cell Ov_V?
If the same cell reaches the limit on every charge once the charge voltage and temperature are correct, ask the distributor to test that module.
Can I reset LVTopsun Chg Cell Ov_V myself?
Only after isolating the AC and DC sides and running the checks above. If LVTopsun Chg Cell Ov_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 Chg Cell Ov_V?
LVTopsun Chg Cell Ov_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 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.
- 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.
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