Why Do I Get Different Voltage Readings Between My Battery Monitor and My Control Panel?
26 December 2020 · 3 min · 4K views
What this video covers
Voltage discrepancies between a DC control panel and a Balmar battery monitor occur because the battery monitor measures values directly at the source, while the control panel measures downstream.0:30 Under electrical load, voltage drop causes the panel to display a lower reading than the battery terminals.1:12 A one-volt difference often indicates undersized wiring between the battery and the panel or poor electrical connections, such as faulty crimps.1:35 Amperage readings also differ because many high-draw devices—including inverters, bilge pumps, downriggers, and heaters—are wired directly to the battery bank rather than through the DC panel.2:05 A properly installed battery monitor uses a shunt to capture the total current flowing in and out of the battery, whereas a panel ammeter only tracks the subset of loads routed through it.2:53 Battery monitors provide a more accurate representation of the system's state than panel-mounted gauges.3:07
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