Victron Smart BatteryProtect 12V/24V: Setup & Wiring

Key Takeaways

• The Smart BatteryProtect SBP-65 SBP-100 SBP-220 provides high-efficiency solid-state DC load protection for 12V and 24V battery systems.
• Supports heavy continuous DC current loads: Max. continuous load current 65A 100A 220A with surge capacities of Peak current 250A 600A 600A.
• Operates across a wide direct-current supply window: Operating voltage range 6 - 35 V with automatic system voltage detection.
• Ultra-low standby battery drain: BLE On and when on: 1.4mA When off or low voltage shutdown: 0.9mA and BLE Off and when on: 1.2mA When off or low voltage shutdown: 0.7mA.
• Filters transient voltage dips with an Alarm output delay 12 seconds and Max. load on alarm output 50mA - short circuit proof.
• Includes built-in disconnect timing: Load disconnect delay 90 seconds (immidiate if triggered by a BMS).
• Prevents load hunting on voltage recovery: Load reconnect delay 30 seconds.
• Pre-configured with standard deep-cycle protection levels: Default thresholds Disengage: 10.5 V or 21 V Engage: 12 V or 24 V.
• Engineered for extreme thermal conditions: Operating temperature range Full load: -40 °C to +40 °C (up to 60% of nominal load at 50 °C).

Solid-State DC Protection & System Architecture

The Victron Smart BatteryProtect isolates non-essential DC circuits before deep discharge harms the battery bank. Using advanced MOSFET power transistors rather than mechanical solenoids, it eliminates coil holding current and prevents contact arcing.

The Victron Smart BatteryProtect 12V/24V is a solid-state DC disconnect switch series (SBP-65 at 65A, SBP-100 at 100A, SBP-220 at 220A; Operating DC Voltage Window: 6 - 35 V with automatic 12V/24V detection) featuring programmable protection logic:

• Battery Protection: 10.5V / 21V Diseng, 12.0V / 24V Engage, 1.4mA BLE Draw, Unidirectional Flow.
• Timing & Alarms: 12s Alarm Delay, 50mA Alarm Port, 90s Disc Delay, 30s Reconn Delay.
• Programming: Bluetooth BLE, VictronConnect, 9 Presets, PROG Pin GND.

Installation Rules & Unidirectional Flow

1. Strict Current Direction: Current must flow strictly from the IN terminal (connected to battery positive) to the OUT terminal (connected to DC loads). Never connect inverters or chargers downstream of an SBP, as reverse current will permanently destroy the MOSFET switches.
2. Wide Operating Window: Compatible with all lead-acid and lithium systems across an Operating voltage range 6 - 35 V.
3. Low Parasitic Drain: Operates with minimal capacity loss: BLE On and when on: 1.4mA When off or low voltage shutdown: 0.9mA, or BLE Off and when on: 1.2mA When off or low voltage shutdown: 0.7mA.

Bluetooth Programming & Threshold Timing

The Smart BatteryProtect is easily tailored using VictronConnect or the manual programming pin:

• Factory Presets: Factory configured to Default thresholds Disengage: 10.5 V or 21 V Engage: 12 V or 24 V, with 9 selectable preset levels available in the app.
• Alarm Delay: An Alarm output delay 12 seconds on the short-circuit-proof alarm terminal (Max. load on alarm output 50mA - short circuit proof) allows brief motor starts without triggering false alarm signals.
• Disconnect & Reconnect Delays: Incorporates a **Load disconnect delay 90 seconds (immidiate if triggered by a BMS) to filter temporary dips, followed by a **Load reconnect delay 30 seconds once voltage stabilizes above the engage threshold.
• Thermal Capabilities: Maintains Operating temperature range Full load: -40 °C to +40 °C (up to 60% of nominal load at 50 °C) for reliable operation in vehicle engine bays and machinery compartments.

Technical Specifications & Current Sizing Table