sync: Add Wrightstown Solar and Smart Home projects

New projects from 2026-02-09 research session:

Wrightstown Solar:
- DIY 48V LiFePO4 battery storage (EVE C40 cells)
- Victron MultiPlus II whole-house UPS design
- BMS comparison (Victron CAN bus compatible)
- EV salvage analysis (new cells won)
- Full parts list and budget

Wrightstown Smart Home:
- Home Assistant Yellow setup (local voice, no cloud)
- Local LLM server build guide (Ollama + RTX 4090)
- Hybrid LLM bridge (LiteLLM + Claude API + Grok API)
- Network security (VLAN architecture, PII sanitization)

Machine: ACG-M-L5090
Timestamp: 2026-02-09

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

projects/wrightstown-smarthome/documentation/ha-yellow-setup.md

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+# Home Assistant Yellow - Setup Guide
+
+**Created:** 2026-02-09
+**Hardware:** Home Assistant Yellow (owned, not yet set up)
+
+---
+
+## What's In the Yellow
+
+- Custom carrier board with Zigbee 3.0 radio (external antenna)
+- Matter-ready architecture
+- M.2 slot for NVMe SSD (add terabytes of storage)
+- Power supply with international adapters (or PoE)
+- Custom heatsink and thermal pad
+- Ethernet cable
+
+**Important:** Yellow production ended October 2025, but continues receiving full software updates. No action needed -- it's still fully supported.
+
+**Requires separately:** Raspberry Pi Compute Module 4 or 5
+- Minimum: CM4 with 2GB RAM + 16GB eMMC
+- Recommended: CM4 4GB RAM + 32GB eMMC
+- CM4 Lite option requires NVMe SSD (no eMMC)
+- CM5 supported since HAOS 14 (November 2024)
+
+---
+
+## Setup Process
+
+### Hardware Assembly
+
+1. Install CM4/CM5 -- align CE mark at bottom, press firmly onto connectors
+2. Apply thermal pad to SOC (silver square near Raspberry icon)
+3. Place heatsink on thermal pad
+4. (Optional) Install NVMe SSD in M.2 slot
+5. Close enclosure
+
+### First Boot
+
+1. Connect Ethernet cable to router
+2. Connect power supply
+3. Wait 5-10 minutes for initial setup
+4. Access Home Assistant at `http://homeassistant.local:8123`
+5. Follow onboarding wizard:
+   - Create admin account
+   - Set location and timezone
+   - Auto-discover devices on network
+
+### Post-Setup Essentials
+
+1. **Install HACS** (Home Assistant Community Store) -- for custom integrations
+2. **Configure Zigbee** -- ZHA integration auto-detects the built-in radio
+3. **Set up backups** -- Automatic daily backups to NAS or cloud
+4. **Install File Editor** -- for editing YAML configs in browser
+
+---
+
+## Local Voice Assistant (Replace Alexa/Google)
+
+### Core Components (All Local, No Cloud)
+
+**Whisper** -- Speech-to-text (OpenAI's engine, runs locally)
+- Processing: ~8 seconds on RPi4 for transcription
+- Languages: English primary, expanding multilingual
+
+**Piper** -- Text-to-speech (neural TTS, optimized for RPi)
+- Multiple voice options
+- Very fast synthesis
+- Natural-sounding output
+
+**Wyoming Protocol** -- Communication standard between voice services
+- Connects Whisper, Piper, and wake word detection
+- Supports remote satellites
+
+**openWakeWord** -- Wake word detection
+- "Hey Jarvis", "Alexa" (custom), "OK Nabu"
+- Custom wake words trainable
+- English-only currently
+
+### Setup Steps
+
+1. Go to Settings > Add-ons
+2. Install "Whisper" add-on > Start
+3. Install "Piper" add-on > Start
+4. Install "openWakeWord" add-on > Start
+5. Go to Settings > Voice Assistants
+6. Create new assistant:
+   - Speech-to-text: Whisper
+   - Text-to-speech: Piper
+   - Wake word: openWakeWord
+   - Conversation agent: (Home Assistant default, or Ollama later)
+
+### Voice Satellites (Room-by-Room Control)
+
+**Option 1: Wyoming Satellite (RPi-based)**
+- Raspberry Pi Zero 2W + microphone + speaker
+- ~$30-50 per room
+- Full wake word + voice processing
+
+**Option 2: ESPHome Voice Satellite (ESP32-based)**
+- ESP32-S3 + I2S microphone + speaker
+- ~$15-25 per room
+- Auto-discovery via Zeroconf
+- Supports media player, timers, conversations
+- ESPHome 2025.5.0+ integration
+
+---
+
+## Key Integrations
+
+### Zigbee (Built-in Radio)
+
+The Yellow has a Silicon Labs Zigbee radio. Use ZHA (Zigbee Home Automation) integration:
+- Auto-detected on first boot
+- Supports 100+ Zigbee device brands
+- No additional dongle needed
+
+**Recommended Zigbee Devices:**
+- Lights: IKEA Tradfri, Philips Hue (Zigbee mode)
+- Sensors: Aqara door/window, motion, temperature
+- Switches: Sonoff SNZB series
+- Plugs: Innr, IKEA, Sonoff
+
+### Victron Solar (Future Crossover)
+
+When Victron MultiPlus II + Cerbo GX are installed:
+
+**Integration Methods:**
+- **Modbus TCP** (recommended): Direct polling via `hass-victron` custom integration
+- **MQTT**: Bidirectional via Cerbo GX
+- **VRM API**: Cloud-based (60-minute refresh, built-in since HA 2025.10)
+
+**Best Practice:** Use 5-second Modbus scan interval (not 20 seconds)
+
+**Energy Automations:**
+- Run high-load devices when battery SOC > 75%
+- Trigger charging at 25%, stop at 50%
+- EMHASS (Energy Management for Home Assistant) for optimal solar usage
+
+### Ollama / Local LLM
+
+Native Ollama integration (HA 2025.6+):
+1. Settings > Devices & Services > Add Integration > "Ollama"
+2. Enter Ollama server URL: `http://<llm-server-ip>:11434`
+3. Settings > Voice Assistants > Select "Ollama" as conversation agent
+
+**Extended OpenAI Conversation** (HACS custom component):
+- Supports OpenAI-compatible APIs (Ollama, LiteLLM)
+- Function calling for HA service control
+- Create automations, query APIs, control devices via natural language
+- Install via HACS custom repository
+
+**Multi-Model Strategy:**
+- Agent 1: Qwen 2.5 7B for real-time voice commands (fast, <1s response)
+- Agent 2: Llama 3.1 70B for complex reasoning (slower, smarter)
+- Route via LiteLLM proxy
+
+---
+
+## Sources
+
+- https://www.home-assistant.io/yellow/
+- https://yellow.home-assistant.io/guides/install-cm4/
+- https://www.home-assistant.io/integrations/wyoming/
+- https://www.home-assistant.io/voice_control/voice_remote_local_assistant/
+- https://www.home-assistant.io/integrations/ollama/
+- https://github.com/jekalmin/extended_openai_conversation