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1.3 AUX battery Distribution (Passenger Wheel Well)

Overview

The AUX battery (Dakota Lithium 135Ah LiFePO4) in the passenger wheel well provides power for high-current accessories and cabin systems:

  1. Direct high-current → Winch (recovery system, no CB per manufacturer spec)
  2. CONSTANT Bus Bar (Blue Sea 2107 PowerBar, 600A) - Feeds SwitchPros, SafetyHub 150, BODY PDU, Fusion Amp
  3. Direct charging input → BCDC Alpha 50 output

See CONSTANT Bus Bar for complete bus bar specifications, SafetyHub for fused distribution, and Circuit Breakers for CB details.

Single Source of Truth

This page is the authoritative source for all AUX battery wire specs (gauge, distance, voltage drop). Component pages reference here. For battery specs see Section 1.1. For ground bus bars see Section 1.5.

AUX battery Positive Terminal (3 connections)

Circuit Destination Wire Gauge Distance Current Voltage Drop Protection
BCDC Alpha 50 Local 4 AWG Short 50A Negligible None
CONSTANT Bus Bar Local 1/0 AWG ~3 ft 254A max 0.9% @ 20°C None
Winch Front bumper 1/0 AWG 13 ft 250A typ, 450A peak 4.9-7.9% @ 20°C None

AUX battery Negative Terminal (5 connections)

Circuit Destination Wire Gauge Distance Current Voltage Drop
Rear Frame Rail Local (chassis) 2/0 AWG ~3 ft 654A peak <0.1V @ 20°C
BCDC Alpha 50 Local 4 AWG Short 50A Negligible
Fusion Apollo Amp Cab firewall 4 AWG ~8-10 ft 78A max 1.2% @ 30°C
START Battery Driver wheel well 1/0 AWG 5-6 ft 75A max <0.05V @ 20°C
Winch Front bumper 1/0 AWG 13 ft 250A typ, 450A peak 4.9-7.9% @ 20°C