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Overkill Solar JBD-SP04S020 - User Manual

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Overkill Solar BMS Instruction Manual
Version: 0.1.0
Date: August 31, 2020

Table of Contents

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Summary

How to Build a Battery Pack

Safety Precautions

Essential safety guidelines to follow when handling battery cells and building a battery pack.

Planning

Steps involved in planning the battery pack build, including gathering components and consumables.

Top Balancing

Procedure for top-balancing battery cells to ensure equal voltage before assembly.

Assembly

Step-by-step instructions for assembling the battery pack and connecting components.

Connect the Balance Wires

Detailed steps for connecting the balance wire harness to the BMS and cells.

Prepare BMS

Instructions on how to mount and prepare the BMS for installation in the battery pack.

Add BMS

Mounting the BMS onto the pack and making essential connections.

Temperature Sensor

Instructions for installing and taping the temperature sensor to the battery cells.

BMS Parameters

Protection Parameters

Parameters related to the BMS's protection features against over/under voltage and temperature.

Cell over voltage

Protects cells from overvoltage during charging by disconnecting current.

Cell under voltage

Protects cells from undervoltage during discharging by disconnecting current.

Battery over voltage

Protects the entire pack from overvoltage during charging.

Battery under voltage

Protects the entire pack from undervoltage during discharging.

Charge over current

Protects against excessive current during charging.

Discharge over current

Protects against excessive current during discharging.

Charge over temperature

Protects against high temperatures during charging.

Charge under temperature

Protects against low temperatures during charging.

Discharge over temperature

Protects against high temperatures during discharging.

Discharge under temperature

Protects against low temperatures during discharging.

Capacity Parameters

Parameters used to display battery capacity and calculate state of charge.

Cycle Capacity

Measures the actual capacity of the pack for accurate state of charge calculation.

Balance Parameters

Settings controlling the cell balancing process and thresholds.

Periodic Maintenance

Troubleshooting & FAQ

Charge Under-Temperature Warning

Troubleshooting steps for under-temperature warnings and sensor issues.

Bluetooth Pairing Issues

Troubleshooting common problems encountered when pairing the Bluetooth module to a phone.

Cell Voltage Discrepancies

Diagnosing and resolving issues with differing cell voltages.

Recovering from Under-Voltage Cutoff

Methods to recover a battery pack that has entered under-voltage protection.

Necessity of a BMS

Arguments and evidence supporting the essential use of a BMS with lithium batteries.

Appendix A: Recommended Parameters

12 V Pack, 4 Cell, Using One 12 V BMS and 100 Ah LiFEPO4 cells

Configuration and Bill of Materials for a 12V, 4-cell battery pack assembly.

12 V Pack, 8 Cell, Using One 12 V BMS

Configuration for a 12V, 8-cell battery pack assembly.

24 V Pack, 8 Cell, Using One 24 V BMS

Configuration for a 24V, 8-cell battery pack assembly.

Appendix B: Calibration

Voltage Calibration

Step-by-step guide to calibrating the BMS voltage readings using a multimeter and app.

Appendix C: About Cell Balancing

Importance of Top-Balancing

Explains why top-balancing is critical for LiFePO4 batteries due to their voltage curve.

Appendix D: BMS Specifications

Appendix E: BMS Application Usage

Overkill Solar JBD-SP04S020 Specifications

General IconGeneral
BrandOverkill Solar
ModelJBD-SP04S020
CategoryControl Unit
LanguageEnglish

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