# Wiring Overview

## House Battery Power Distribution

House Battery Positive
├── 5A Fuse → ESP32 Controller
├── 3A Fuse → 12V→5V Buck Converter
├── 30A Fuse → Fridge Relay
└── 30A Fuse → Starlink Relay

House Battery Negative
├── ESP32 Ground
├── Buck Converter Ground
├── Relay Grounds
└── Sensor Grounds

## Dashboard Power

12V House Battery
↓
Buck Converter (5V)
↓
CAT5 Cable
↓
Pico Dashboard

## Communications

Pico
↓
RS-485
↓
ESP32

Backup:
WiFi

## Relay Control

ESP32 Relay Output
↓
Bosch Relay Coil

Bosch Relay Contacts
↓
Fridge / Starlink / Future Loads

No high-current loads pass through the ESP32 relay board.

## Temperature Sensors

Single DS18B20 Bus

Sensors:
- Fridge Zone 1
- Fridge Zone 2
- Rear Seat Area
- Outside Air

Future:
- Battery Compartment
- Cabin Air
- Water Tank