How Battery Monitors Actually Work (and Why You Need One) - Battery Monitoring Playlist | Ep: 1/3
October 31, 2025 · 11 min · 29K views
Hands hold shunt against blue studio backdrop
What this video covers
Battery monitors provide essential data on state of charge, depth of discharge, voltage, and current flow for off-grid electrical systems.▶ 0:25 While simple voltage-sensing monitors work for lead-acid or AGM batteries, they fail to accurately track lithium batteries because lithium voltage remains relatively stable across a wide range of discharge.▶ 3:25 Shunt-based monitors, such as the Victron SmartShunt, BMV712, or models from Red Arc and Midnight Solar, use a shunt installed in-line between the battery bank and system loads to measure actual current flow.▶ 5:59 This hardware acts as a fuel-tank sending unit, providing the data necessary for display hubs like the Victron Cerbo GX or Ekrano GX.▶ 9:58 Although some modern batteries include internal monitoring, a dedicated shunt provides a reliable, brand-agnostic fallback that ensures consistent data regardless of firmware compatibility between different manufacturers.▶ 11:04 Installing a shunt-based monitor prevents the guesswork associated with managing battery capacity, functioning similarly to a fuel gauge in a vehicle.
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