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How Does ‘DC Input Low Pre-Alarm’ setting work in VictronConnect using Multiplus
There’s a setting named ‘DC input low pre-alarm’ in the ‘Inverter’ section of the VictronConnect app, after connecting my Multiplus-II to my computer, using the MK3 USB interface device. Can you explain the function of this setting and its relation to the other DC input settings like ‘low restart’ and ‘low shut-down’?
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1 Reply
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The ‘DC input low pre-alarm’ setting in VictronConnect is designed to give you an early warning that the battery is approaching a critically low voltage level before it actually reaches the shutdown threshold.
Function:
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This pre-alarm alerts you that the battery voltage is getting close to the ‘DC input low shutdown’ level, allowing you to take action to reduce consumption or initiate charging before the inverter shuts down to protect the batteries.
Relative Setting:
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The pre-alarm level is set as an offset relative to the ‘DC input low restart‘ voltage. Since the ‘low restart‘ level is already set above the ‘low shutdown’ voltage, the pre-alarm is essentially a higher level than both of these, occurring before either shutdown or restart conditions are met.
Interconnected Changes:
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It’s important to note that when you adjust either the ‘DC input low restart‘ or the ‘DC input low shut-down’ levels, the ‘DC input low pre-alarm’ level changes as well because it is tied to these settings.
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If, for example, you raise the ‘low restart‘ voltage, the ‘pre-alarm‘ voltage will increase by the same amount, maintaining its offset from the restart level.
Usage Tips:
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When configuring your system, you should determine the pre-alarm level based on how much advance notice you need to respond to a low battery situation, and how quickly your battery voltage tends to drop.
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This feature is particularly useful in systems where manual intervention is necessary to start a backup generator or to switch off non-essential loads to conserve power.
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