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wkcollis1-eng/README.md

William Collis

Residential Energy Systems & Data-Driven Home Automation

I build, instrument, and analyze residential energy systems with engineering-grade rigor. My projects combine DIY hardware, statistical analysis, and open data.

Projects

⚡ LiFePO₄ Battery Bank Study

500Ah DIY battery bank with 130+ days of continuous monitoring. Validates "architectural immunity" hypothesis for mixed-brand parallel cells. Includes 712k high-frequency samples, reproducible analysis scripts, and open datasets.

DOI

🔌 DIY LiFePO₄ UPS

12V UPS for Home Assistant and network equipment. Sub-millisecond switchover via MOSFET ideal diode, 8+ hour runtime, Shelly Plus Uni monitoring.

🏠 Home Assistant Config

Production Home Assistant configuration implementing statistical process control (±2σ bounds) for HVAC efficiency monitoring. CI/CD validated.

📊 HVAC Performance Baseline

50-month energy study of a 2,440 ft² home in Connecticut. Establishes diagnostic baselines using verified utility data and runtime telemetry. 42.8 kBTU/ft²-yr (31% better than regional average).

Approach

  • Open data — Raw datasets published for reproducibility
  • Statistical rigor — OLS regression, control charts, uncertainty quantification
  • Documentation — Methodology, evidence maps, replication guides
  • DIY pragmatism — Cost-effective solutions with measured performance

Connecticut, USA

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  1. Lifepo4-Battery-Banks Lifepo4-Battery-Banks Public

    DIY LiFePO₄ 12V battery bank study: ~397Ah delivered in load test; 94+ days of pack-level monitoring of mixed-brand parallel topology (“architectural immunity” hypothesis). Includes raw data, analy…

    Python

  2. Residential-HVAC-Performance-Baseline- Residential-HVAC-Performance-Baseline- Public

    This repository documents a comprehensive energy performance baseline for a 2,440 sq. ft. high-efficiency residential structure in Central Connecticut (Climate Zone 5A). The analysis integrates fou…

  3. home-assistant-config home-assistant-config Public

    Home Assistant configuration for energy performance tracking and HVAC monitoring

    Python

  4. DIY-LiFePO4-UPS DIY-LiFePO4-UPS Public

    DIY 12V LiFePO4 UPS for Home Assistant Green and Xfinity XB7 modem. Victron BP-65 LVD, MOSFET ideal diode, 13.3V float, Shelly Plus Uni monitoring.

    3