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>
2026-02-10 18:44:35 -07:00
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+# Wrightstown Solar - BMS Comparison (Victron CAN Bus Compatible)
+
+**Created:** 2026-02-09
+**System:** 16S5P, EVE C40 20Ah, 48V, Victron MultiPlus II + Cerbo GX
+
+---
+
+## Quick Comparison
+
+| BMS | Price | Current | Balancing | Victron Method | Complexity |
+|---|---|---|---|---|---|
+| **JK BMS B2A8S20P** | $80-150 | 100-200A | 2A Active | dbus-serialbattery (USB) | Moderate |
+| **SEPLOS V3/V4** | $150-250 | 100-200A | Passive | Native CAN | Easy |
+| **Overkill Solar (JBD)** | $280-320 | 100A | Passive | dbus-serialbattery (USB) | Moderate |
+| **123SmartBMS Gen3** | $300-400 | Configurable | 1A Active | Native USB to Cerbo | Easy |
+| **REC BMS Q16** | $559 | Varies | 0.9A Passive | Native CAN (plug & play) | Easiest |
+| **Batrium WatchMon** | $650-850 | High (shunt) | 28Ah/day | Native CAN | Complex |
+| **Daly Smart BMS** | $80-150 | 100A/50A charge | 30mA Passive | dbus-serialbattery | Moderate |
+| **Orion BMS** | $500+ | Configurable | Active options | Native CAN | Easy |
+
+---
+
+## Recommended: JK BMS B2A8S20P (150A Version)
+
+### Why This BMS for EVE C40 Cylindrical Cells
+
+- **2A active balancing** -- Critical for cylindrical cells which have more cell-to-cell variation than prismatic. With 5P strings, mismatches multiply. Passive balancing at 30-200mA takes days; JK's 2A active balancing corrects in hours.
+- **150A rating** -- 16S5P is 100Ah, so 150A provides headroom for inrush and peak loads
+- **$80-150** -- Best value in the market
+- **Huge DIY community** -- Every problem already solved on forums
+
+### Specs
+
+- Current ratings: 100A, 150A, 200A options
+- Balancing: 2A active (best in class at this price)
+- Communication: Bluetooth, RS485, CAN, UART
+- Monitoring: Real-time via smartphone app
+- Temperature: Multiple sensor inputs
+
+### Victron Integration
+
+```
+JK BMS --[USB-UART cable ($15)]--> Cerbo GX
+                                      |
+                                 dbus-serialbattery
+                                 (free open-source driver)
+                                      |
+                                 DVCC enabled
+                                      |
+                              Victron MultiPlus II
+```
+
+**Required:**
+1. USB-UART cable (~$15)
+2. dbus-serialbattery driver (free, install via SSH on Cerbo)
+3. DVCC enabled in Cerbo settings
+
+### [WARNING] Known Gotcha: Reversed CAN Pinout
+
+JK BMS has CAN-H and CAN-L SWAPPED compared to Victron's RJ45 pinout. Solutions:
+- Buy pre-made JK-to-Victron cable (AliExpress)
+- Make your own cable and swap pins 7 & 8
+- Use USB-UART connection instead (avoids CAN entirely -- recommended path)
+
+### Known Issues
+
+- Firmware updates frequently with no changelog -- check forums before updating
+- SOC can jump from 85% to 100% prematurely during fast charge
+- Battery capacity/consumed Ah data may not transmit to Cerbo via some driver versions
+- Inconsistent quality control between batches -- test thoroughly on arrival
+
+### Where to Buy
+
+- AliExpress: $80-120 (multiple sellers)
+- Amazon: $120-180 (JKBMS official store)
+- EEL Battery, SeLian Energy (resellers)
+
+---
+
+## Alternative: SEPLOS V3/V4 (Easiest Native CAN)
+
+### Why Consider
+
+- Native Victron CAN protocol -- no drivers needed
+- One CAN cable to Cerbo, auto-detects
+- Multiple units can chain on one CAN link (good for expansion to 4 packs)
+- $150-250 is reasonable mid-tier pricing
+
+### Drawbacks
+
+- Passive balancing only (slower than JK's active)
+- Less community documentation
+- Setup can be tricky initially
+
+### Where to Buy
+
+- Seplos.com (official)
+- AliExpress, Alibaba
+
+---
+
+## Premium Option: REC BMS Q16 (Zero Hassle)
+
+### Why Consider
+
+- TRUE plug and play -- one CAN cable, auto-detected, DVCC works immediately
+- Most reliable Victron integration available
+- Professional-grade, excellent documentation
+- SOC/SOH calculation, cell resistance measurement
+
+### Drawbacks
+
+- $559 -- nearly 4x the JK price
+- Passive balancing only (0.9A) -- slower for cylindrical cells
+- No active balancing option
+
+### Where to Buy
+
+- Off Grid and Marine Energy (OGM Energy): $559
+- REC-BMS.com (official)
+
+---
+
+## Budget Option: Daly Smart BMS [NOT RECOMMENDED]
+
+### Why to Avoid for This Build
+
+- 100A discharge but only **50A charge** -- will bottleneck solar charging
+- 30mA passive balancing -- useless for large cells (would take 200+ hours)
+- CAN speed mismatch: Daly defaults to 250kbit/s, Victron uses 500kbit/s
+- Developers of dbus-serialbattery specifically do NOT recommend Daly for new builds
+- Bad CAN communication implementation
+
+---
+
+## Victron Side Configuration
+
+### Hardware Required
+
+**Cerbo GX ($320-350) -- Recommended**
+- Native BMS-CAN port (500kbit/s)
+- 2x USB ports for dbus-serialbattery driver
+- Built-in display, Ethernet, WiFi
+- VRM remote monitoring portal
+
+**Budget Alternative: Venus OS on Raspberry Pi 4 (~$100)**
+- No native CAN bus -- needs USB CAN adapter ($20-40)
+- More complex setup
+- Works for USB-UART BMS connection (JK, Overkill)
+
+### CAN Cable Pinout (Cerbo GX BMS-CAN RJ45)
+
+| Pin | Function |
+|---|---|
+| 3 | GND |
+| 7 | CAN-H |
+| 8 | CAN-L |
+
+Only 3 wires needed. Always verify against your specific BMS datasheet.
+
+### Software Settings
+
+1. **Update firmware** on Cerbo GX, MultiPlus II, and any MPPTs to latest
+2. **Battery Monitor:** Set to BMS (not "Automatic")
+3. **DVCC:** Enable
+4. **DVCC Sub-settings:**
+   - Limit managed battery charge voltage: OFF (let BMS control via CVL)
+   - SVS (Shared voltage sense): ON
+   - SCS (Shared current sense): OFF
+   - STS (Shared temperature sense): Optional
+5. **BMS-CAN speed:** 500kbit/s (default, don't change)
+
+### dbus-serialbattery Driver (for JK/Overkill/Daly via USB)
+
+- Install on Cerbo via SSH
+- Edit `/data/etc/dbus-serialbattery/config.ini`
+- Set BMS type and serial port
+- Free, open source: https://github.com/Louisvdw/dbus-serialbattery
+
+### DVCC Explained
+
+DVCC allows the BMS to send real-time limits to the Victron system:
+- **CVL** (Charge Voltage Limit) -- max voltage the battery will accept
+- **CCL** (Charge Current Limit) -- max charge current right now
+- **DCL** (Discharge Current Limit) -- max discharge current right now
+
+The Cerbo relays these to the MultiPlus and any solar chargers, preventing overcharge, over-discharge, and overcurrent dynamically.
+
+---
+
+## Common Mistakes to Avoid
+
+1. **CAN speed mismatch** -- Victron is 500kbit/s, some BMS default to 250kbit/s
+2. **JK pinout reversal** -- CAN-H and CAN-L are swapped on JK BMS
+3. **Enabling DVCC without setting battery monitor** -- set monitor FIRST
+4. **SVS with disconnect BMS** -- if BMS disconnects on overvoltage, turn SVS OFF
+5. **Multiple BMS on CAN** -- only ONE BMS should control Victron via DVCC (use master/slave for multi-pack)
+6. **Charging below 0C** -- LFP cannot be charged below freezing; ensure BMS low-temp cutoff is configured
+7. **Passive balancing on large cells** -- 30mA on 20Ah cells takes forever; use active balancing
+
+---
+
+## Sources
+
+- [Victron Compatible BMS - DIY Solar Forum](https://diysolarforum.com/threads/victron-compatible-lifepo4-bms.47111/)
+- [Victron Community - Compatible BMS List](https://community.victronenergy.com/questions/13574/list-of-compatible-bms-vebus-or-canbus.html)
+- [JK BMS and DVCC - Victron Community](https://community.victronenergy.com/t/jk-bms-and-dvcc/29580)
+- [REC BMS Victron Integration Guide - OGM Energy](https://ogm-energy.com/community/ogm-user-forum/topic/154310/)
+- [dbus-serialbattery GitHub](https://github.com/Louisvdw/dbus-serialbattery)
+- [Victron DVCC Documentation](https://www.victronenergy.com/media/pg/CCGX/en/dvcc---distributed-voltage-and-current-control.html)
+- [VE.Can to CAN-bus BMS Cables](https://www.victronenergy.com/live/battery_compatibility:can-bus_bms-cable)