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-solar/session-logs/2026-02-09-session.md

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+# Wrightstown Solar - Session Log 2026-02-09
+
+**Session:** Initial Research and Planning
+**Machine:** ACG-M-L5090
+
+---
+
+## Work Completed
+
+### 1. Cell Selection Research
+- Researched EVE C40 (IFR40135) cylindrical LiFePO4 cells
+- Specs: 3.2V, 20Ah, 64Wh per cell, 366g, 50-60A continuous discharge
+- Selected for home solar battery pack build
+
+### 2. Pack Design
+- Determined 16S5P configuration for 5kWh packs (80 cells each)
+- 48V nominal system, 51.2V actual
+- Modular design: build in 5kWh increments up to 20kWh (4 packs)
+- Chose 5kWh over 10kWh packs for: cost spreading, manageable builds, fault isolation, single-person liftable weight
+
+### 3. Inverter Selection
+- Existing solar: Fronius IG Plus (grid-tie only, no battery port)
+- Selected Victron MultiPlus II 48/5000 for:
+  - <20ms transfer (UPS-grade seamless switchover)
+  - Physical relay disconnect (zero backfeed)
+  - Generator input support
+  - Creates micro-grid for Fronius to sync during outages
+- Architecture: whole-house UPS with generator failover
+
+### 4. Salvaged EV Battery Analysis
+- Evaluated Tesla LFP, Chevy Bolt, Nissan Leaf salvage options
+- Conclusion: New C40 cells are cheaper ($190-282/kWh vs $365-780/kWh for salvage)
+- Salvage has hidden costs: voltage conversion, custom BMS, cooling, unknown SOH
+- Most salvage is NMC chemistry (less safe than LFP for home use)
+- Decision: Proceed with new EVE C40 cells
+
+### 5. BMS Research (Victron CAN Bus Compatible)
+- Comprehensive comparison of 8 BMS models
+- Recommended: JK BMS B2A8S20P 150A ($80-150)
+  - 2A active balancing (critical for cylindrical cells)
+  - Victron integration via dbus-serialbattery driver + USB-UART cable
+  - Known gotcha: CAN pinout reversed (use USB-UART path instead)
+- Alternatives: SEPLOS V4 (native CAN, $150-250), REC Q16 (plug & play, $559)
+- Cerbo GX ($320-350) selected as GX device
+
+### 6. Budget Estimates
+- Phase 1 (5kWh + full Victron system): $2,175-2,945
+- Full 20kWh system: $3,635-5,750
+- Battery-only $/kWh: $86-153
+
+---
+
+## Decisions Made
+
+| Decision | Chosen | Over | Why |
+|---|---|---|---|
+| Cell type | EVE C40 (new) | Salvaged EV packs | Cost, safety, lifespan, simplicity |
+| Pack size | 5kWh modules | 10kWh modules | Modular, manageable, fault isolation |
+| Inverter | Victron MultiPlus II 48/5000 | Other options | UPS switchover, relay disconnect, generator support |
+| BMS | JK BMS B2A8S20P 150A | REC, SEPLOS, Daly | Active balancing, price, community support |
+| GX device | Cerbo GX | Raspberry Pi | Easier setup, native BMS-CAN port |
+
+---
+
+## Files Created
+
+- `projects/wrightstown-solar/PROJECT_INDEX.md`
+- `projects/wrightstown-solar/documentation/system-design.md`
+- `projects/wrightstown-solar/documentation/bms-comparison.md`
+- `projects/wrightstown-solar/documentation/ev-salvage-analysis.md`
+- `projects/wrightstown-solar/documentation/parts-list.md`
+- `projects/wrightstown-solar/session-logs/2026-02-09-session.md` (this file)
+
+---
+
+## Next Steps
+
+- [ ] Finalize BMS selection
+- [ ] Source EVE C40 cells (Grade A, matched, with test data)
+- [ ] Order Victron MultiPlus II + Cerbo GX
+- [ ] Design physical cell holder / bus bar layout for 16S5P cylindrical pack
+- [ ] Plan sub-panel / transfer switch wiring
+- [ ] Build Pack 1, test for 1 month before expanding