For many locomotives, the only information available about the battery is its voltage. This alert is designed to detect a low battery charge using the battery voltage.
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The principle behind this alert is that during battery discharge, the voltage remains mostly constant until near the end. However, as the charge drops, the voltage decrease becomes steeper, allowing the alert to detect that the end of the discharge is approaching. The alert uses past battery data to determine a voltage threshold indicating a low charge.
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​Two thresholds are provided:

To account for battery variability (which depends heavily on history and ageing), thresholds are computed per asset and updated monthly.
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For each asset that includes battery voltage data, Railnova automatically computes alert thresholds after one month of data collection (the update occurs on the first day of each month).

The Railnova system then automatically generates a “battery_warning_level” or “battery_critical_level” message. To convert these messages into alerts, the Railgenius Rule Engine can be used.

For instance, to set up an alert when the battery reaches the critical level, the opening condition would be as follows:

For more details about how to use the Railgenius Rule Engine, you can refer to the following documentation article:

⚠ The message “battery_critical_level” and “battery_warning_level” will only appear in the rule engine if the message has already been generated once on one of your fleet’s locomotives for a specific class.

This behaviour will be corrected shortly, allowing alert configuration from the installation day onward.