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This page will outline all the electrical components everything that will be going inside of the enclosure. This will include everything that requires electrical connection except the battery pack and the aux batteryThe top level battery box CAD should in theory include everything as well, but it takes time to include everything in the CAD and opening top level is kinda annoying so this is a better reference.

Main Power Switch

Type

Part

Used For

QTY

Location/Mounting Method

Battery

Battery Module

  • Makes up the main pack

  • 9 modules in series, each module is 4S8P, each cell is a 21700 LG M50T battery

9

Bolted to the bottom of the enclosure, 2 bolts for each module (diagonal holes).

AUX Battery

  • Back-up batteries for power-up sequence and in case main pack fails

  • Heat shrunk 10S1P, each cell is a NiMH battery.

1

Inside a separate 3D printed box. Box itself is secured on top of a module

Boards

AFE

  • Handles interactions with main pack

  • Reads cell voltages & temperatures.

  • Performs load balancing

3

Mounted on top of three modules using bolts (using heat set inserts on the modules).

Current Sense

  • Reads pack current

1

BMS Carrier

  • Brain of the BMS system. Logs voltage, current, temperature, triggers BMS switch.

  • Used for SOC model

  • Watches our for overvoltage, overcurrent, undervoltage, undercurrent

1

DCDC

  • Converts pack voltage (HV) to voltage usable for low voltage electrical components (like fans, boards, lights, horn, etc.)

1

Mounted on top of a module using an adapter plate. DCDC goes onto adapter plate, adapter plate goes onto the module.

Relay

Main Pack Relay

  • Electrically isolates battery pack

  • Part of Main Power Switch (as defined by ASC)

2

Solar Relay

  • Electrically isolates battery pack

  • Part of Main Power Switch (as defined by ASC)

1

Motor Switch

  • Used for facilitating pre-charge

1

Fuse

Main Fuse

  • Protects components in case of current surge

1Battery Pack Accessories

Cooling Components

Noctua NF-F12 IPPC 3000 Fans

  • Cooling main pack (hopefully)

2

Air Baffles

  • Three types of air baffles

  • Prevents airflow going over the modules

4

Inlet

  • 3D Printed inlet for connecting to air duct

2

Outlet/Fan Holders

  • 3D Printed outlet for holding outlet fans

2

Connector

Molex MX150L 12 Circuit Panel Mount Plug

(MFG. P/N: 194290031)

  • For LV connections including boards & AUX

1

Molex MX150L 4 Circuit Panel Mount Plug

(MFG. P/N: 194290025)

  • 1 for HV connection to solar

  • 1 for extra in case we need more LV connections

2

SB120 Anderson Connector

(MFG. P/N: 6810G1-BK)

  • For HV connection to motor

1

Possible Changes

...

ASC reg. 8.5.B states that wires “branching off the main bus circuit must have properly sized fuses”. Currently the main fuse is between the positive terminal of the pack and a main pack relay. It must be clarified with ASC whether by “branching off the main bus circuit”, they are requiring us to have fuses after the main fuse to protect components. I asked Forest and he wasn’t 100% sure either.

...