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Keith Arnold avatar image
Keith Arnold asked

Charge Voltage Setpoint

I get High Voltage Alarm from BMV, hi alarm set at 55 V. I track Charge Voltage Setpoint on VRM custom widget, 57.5 V in Bulk (battery Volts are normal), where does this setpoint come from? The High alarm seems to occur when the VE bus state changes from Bulk to Absorption, in Absorption setpoint becomes 53.5 (battery Volts settle on 53.5V), as set in VE Config, and Setpoint 51 V when in Float (Battery volts 51 V). all as per battery requirements. Max volts on battery is 55 V. Some voltage spikes are higher than 58 V. i have been trying to catch this on my fluke 187 with fast high/low V but have not managed it yet....

system is Multiplus 5 kW, 250/70 smart solar, AC coupled Fronius 4 kW, 4 Huawei 120A Li-Ion, bmv 700, CCGX.

overvoltage
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Alexandra avatar image Alexandra ♦ commented ·
@Keith Arnold

I have seen what you are describing when batteries switch off or bms refuses charge. You can get an overshoot in production when they do that, hence the spike.

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