Tech-dat/insulator-dat/insulator-dat.md
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+# insulator-dat
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+- **Yellow Wax Tube (Varnished Glass Fiber Sleeving)**: A traditional insulating sleeve made from glass fiber braided with a coating of synthetic resin. It provides basic electrical insulation and mechanical protection for wires and joints.
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+- **Barley Paper (Fish Paper)**: A durable, flexible electrical insulation paper (often green or cyan) made from vulcanized fiber. It is widely used for insulating battery packs (between cells and cases), transformers, and motor windings due to its high dielectric strength and mechanical toughness.
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+
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+## ref
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battery-dat/battery-pack-LFP-dat/battery-pack-LFP-dat.md
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- [[battery-LFP-4S-dat]] == 12.8V
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+- [[battery-pack-solderless-dat]]
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+
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## Build
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| Cells | Configurations |
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![](2026-07-08-04-22-23.png)
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+4x8 == 48V 30A
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+## 16S
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+
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+### 1. Voltage Specifications Matrix
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+Because LFP voltage profiles shift based on charge state and current load, configurations must align with the three primary operational thresholds:
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+| Parameter State | Per Cell Threshold | **Total 16S Pack Voltage** | Engineering & BMS Logic |
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+| :--- | :--- | :--- | :--- |
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+| **Maximum Charge Cut-off** | 3.65 V | **58.4 V** | Absolute high-voltage ceiling. BMS must trip if any single cell touches 3.65V. |
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+| **Nominal Rating** | 3.20 V | **51.2 V** | Standard baseline used for calculating pack system capacity (Wh = Ah × 51.2V). |
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+| **Discharge Cut-off (Empty)** | 2.50 V | **40.0 V** | Absolute low-voltage floor. BMS must disconnect loads to prevent copper plating/permanent damage. |
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+
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+---
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+
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+### 2. Resting Voltage vs. State of Charge (SoC)
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+Due to the characteristic flat discharge curve of $LiFePO_4$ chemistry, open-circuit voltage (OCV) remains highly stable throughout the mid-range of capacity. The following values reflect a settled, resting 16S pack (no load, no charge for at least 30 minutes):
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+
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+* **100% SoC:** ~54.4 V to 56.0 V *(Surface charge dissipates rapidly down from 58.4V once charging terminates)*
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+* **90% SoC:** ~53.3 V
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+* **70% SoC:** ~52.5 V
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+* **50% SoC:** ~51.5 V
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+* **30% SoC:** ~51.3 V
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+* **10% SoC:** ~50.4 V *(The curve begins its sharp downward knee here)*
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+* **0% SoC:** 40.0 V to 44.0 V *(Voltage drops off a vertical cliff under load)*
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## Ref
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- [[battery-LFP-pack]] - [[battery-li-lfp]]
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battery-dat/battery-pack-dat/battery-pack-design-dat/2026-07-08-04-45-31.png
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battery-dat/battery-pack-dat/battery-pack-design-dat/battery-pack-design-dat.md
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+# battery-pack-design-dat
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+- [[battery-pack-design-dat]] - [[battery-pack-dat]] - [[battery-pack-solderless-dat]]
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+## simple column to column series design
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+6x13 == 6P13S == 48V 15A
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+![](2026-07-08-04-45-31.png)
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+## ref
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+
battery-dat/battery-pack-dat/battery-pack-solderless-dat/2026-07-08-04-26-56.png
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battery-dat/battery-pack-dat/battery-pack-solderless-dat/2026-07-08-04-29-52.png
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battery-dat/battery-pack-dat/battery-pack-solderless-dat/2026-07-08-04-30-40.png
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battery-dat/battery-pack-dat/battery-pack-solderless-dat/2026-07-08-04-32-25.png
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battery-dat/battery-pack-dat/battery-pack-solderless-dat/battery-pack-solderless-dat.md
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+# battery-pack-solderless-dat
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+- [[battery-pack-dat]] - [[battery-pack-solderless-dat]]
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+- [[fab-3d-print-dat]]
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+![](2026-07-08-04-26-56.png)
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+- [[bolt-dat]] - [[spring-dat]]
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+![](2026-07-08-04-29-52.png)
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+![](2026-07-08-04-30-40.png)
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+![](2026-07-08-04-32-25.png)
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+## ref
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battery-dat/battery-pack-li-dat/battery-pack-dat.md
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# battery-pack-dat
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-
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+- [[battery-pack-dat]] - [[battery-pack-solderless-dat]]
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- [[battery-holder-dat]] - [[battery-holder-18650-dat]] - [[battery-holder-AA-dat]]
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- [[battery-charger-dat]]
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+- [[insulator-dat]] - [[fab-PCB-soldering-dat]]
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+- [[battery-pack-dat]] - [[battery-pack-LFP-dat]]
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+- [[battery-pack-design-dat]]
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## accessories
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- [[sensor-dc-voltage-dat]]
fab-mechanics-dat/mechanical-parts-dat/bolt-dat/bolt-dat.md
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- [[bolt-t-dat]] - [[bolt-dat]]
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-
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+- [[bolt-dat]] - [[spring-dat]] - [[battery-pack-solderless-dat]]
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## bolt vs screw