====== Batteries ======  
This section covers Wolf's experiments, tests, and guides on off-grid battery systems, including LiFePO4, NMC, and repurposed EV batteries.  

===== Categories =====  
  * [[:diy-lithium-batteries|DIY Lithium Batteries]]  
  * [[:battery-testing|Battery Testing & Comparisons]]  
  * [[:bms|Battery Management Systems (BMS)]]  
  * [[:second-life-batteries|Second-Life EV Batteries]]  

===== DIY Lithium Batteries =====  
Wolf's builds and guides for home-assembled LiFePO4 and other lithium-based systems.  

=== 12V LiFePO4 Build ===  
  * **Cells Used**: 280Ah LiFePO4 (EVE, CATL)  
  * **BMS**: JBD/Overkill Solar 120A  
  * **Project Notes**:  
    - [[https://off-grid-garage.com/sample-lifepo4-build|Step-by-step build log]]  
    - [[https://youtube.com/watch?v=example|Video Tutorial]]  

=== 48V Solar Storage Pack ===  
  * **Cells Used**: 16x 3.2V LiFePO4 (used EV modules)  
  * **BMS**: Daly 250A Smart BMS  
  * **Efficiency Test Results**: 94% round-trip  

===== Battery Testing & Comparisons =====  
Independent capacity, cycle life, and performance tests.  

=== LiFePO4 vs. NMC ===  
^ Chemistry ^ Cycle Life ^ Energy Density ^ Cost ^  
| LiFePO4 | 3000+ cycles | Lower | $$$ |  
| NMC | 1000-2000 cycles | Higher | $$ |  

=== Capacity Degradation Tests ===  
  * [[https://off-grid-garage.com/test-1|Test 1: 0.5C vs 1C Discharge Impact]]  
  * [[https://off-grid-garage.com/test-2|Test 2: Temperature Effects]]  

===== Second-Life EV Batteries =====  
Guides for reusing Nissan Leaf, Tesla, or BMW modules.  

=== Nissan Leaf Modules ===  
  * **Voltage**: 7.5V per module  
  * **Capacity**: ~60Ah (varies with health)  
  * **Project**: [[https://off-grid-garage.com/leaf-storage|24V Solar Bank Build]]  

===== Tools & Resources =====  
  * [[:busbars|Busbar Sizing Guide]]  
  * [[:spot-welding|Spot Welding Tips]]  
  * [[:safety|Battery Safety Protocols]]  


====== Battery DIY-Kits (Off-Grid-Garage) ======

This page presents a range of DIY battery construction kits designed for building your own battery packs. These kits include pre‐configured cases with all the necessary accessories (e.g. flexible busbars, BMS options, compression supports, terminals, etc.) to assemble battery systems for applications like off‑grid solar, electric vehicles, RVs, and more.

===== DIY Solar Battery Projects =====
The DIY‑Kits page features several popular options:

  * **YIXIANG DIY Case for 24V and 48V Systems**  
    - Comes with a 200A JK Inverter BMS, 4.3″ touch display, DC breaker, flexible busbars, double M8 terminals, a middle support rail, side handles, and a hook & latch system for stacking.  
    - Review video and Alibaba product link available (see [[https://youtu.be/...|review video]] and [[https://offer.alibaba.com/...|Alibaba link]]).

  * **Gobelpower DIY Kit**  
    - Offers a complete set for building your battery; you may either use your own cells or buy them directly from Gobelpower.
    - The new V2 version now includes a 200A JK Inverter BMS and a 2A active balancer.
    - More details at [[https://www.gobelpower.com/...|Gobelpower product link]].

  * **EEL V5 JK-48V-Box**  
    - A recently upgraded DIY Box Kit featuring a JK inverter BMS with a 4.3″ touch display, integrated 250A fuse, flexible busbars, and additional safety elements such as a fire extinguisher.
    - See the [[https://youtu.be/...|review video]] and product page at [[https://eelbattery.myshopify.com/...|EEL product link]].

  * **Other Options:**  
    - **EEL 48V/16s DIY Box:** Available in stackable, free-standing, and wall-mounted formats, suitable for 230–330Ah cells.
    - **SEPLOS MASON DIY Kit:** Designed for building a robust 48V system (~15kWh). Comes with a 200A Seplos BMS, cables, and balance boards.
    - **Sun Fun Kits DIY Battery Kits:** These kits are available in variations (with or without batteries, with heating or active balancing) and offer flexibility for 12V systems.

===== EVE LiFePO₄ Cells Compatibility =====
The DIY‑kits are particularly popular for use with prismatic LiFePO₄ cells from EVE (such as the MB30/MB31 and LF304 models).

  * **Typical Cell Dimensions:**  
    - **Length:** Approximately 173.5–173.7 mm  
    - **Thickness:** Approximately 71.7–72.0 mm  
    - **Height:** Approximately 207–209 mm  
      - Some datasheets further specify height “with terminal” (around 207.2 mm) and “without terminal” (around 204.6 mm).

These dimensions are well suited to the internal layout of the Off‑Grid‑Garage DIY‑kits. In fact, the cases are designed with a focus on accommodating common LiFePO₄ prismatic cell sizes. Customer review videos and product descriptions consistently show that these cells integrate seamlessly into the kit enclosures.

===== Conclusion =====
Based on the documented dimensions and the design philosophy of the DIY‑Kits, **the EVE LiFePO₄ cells (MB30/MB31/LF304) do indeed fit in these battery DIY‑kits.** If you plan on building a battery pack using these kits, be sure to verify your chosen cell’s datasheet and compare its measurements with the kit’s internal dimensions.

===== External References =====
  * [[https://off-grid-garage.com/diy-kits/|Battery DIY-Kits – Off-Grid-Garage]]
  * [[https://youtu.be/...|DIY Case Review Video]]
  * [[https://offer.alibaba.com/...|Alibaba Product Link]]

===== Discount Codes & Additional Notes =====
  * **Discount Codes:**  
    - `DF5HJ67SD` – 2% off (min order $100)  
    - `SAVING12OFG` – 4% off (min order $500)  
    - `UIKFGRD5` – 5% off (selected products)  
    - `PCTOFFADY` – 5% off (for certain cells)

  * **Note:** Always check the latest cell datasheet (dimensions, voltage, and capacity) before ordering to ensure complete compatibility with your chosen DIY‑kit.