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Overkill Solar BMS Series User Manual
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2.4 Assembly
2.4.1 Arranging the Cells
Lay out your cells in the correct orientation. Do not install the bus bars yet.
NOTE:
In this section, the 12V 4-cell and 24V 8-cell configurations are shown. Other configurations are
covered in
Appendix A
.
8
10
Table of Contents
Default Chapter
2
Table of Contents
2
1 Introduction
5
What Is a BMS
5
2 How to Build a Battery Pack
5
Safety Precautions
5
Planning
5
Gather Components
5
Gather Consumables
6
Gather Tools
7
Top Balancing
7
Assembly
9
Arranging the Cells
9
Connect the Balance Wires
11
Prepare BMS
12
Add BMS
12
Temperature Sensor
13
External Switch
13
Connectivity
14
Bluetooth Module
14
USB Interface
15
Arduino LCD Display
16
3 BMS Parameters
16
Protection Parameters
16
Cell over Voltage
16
Cell under Voltage
17
Battery over Voltage
17
Battery under Voltage
18
Charge over Current
18
Discharge over Current
19
Charge over Temperature
19
Charge under Temperature
19
Discharge over Temperature
19
Discharge under Temperature
19
Capacity Parameters
19
Designed Capacity
20
Cycle Capacity
20
Full Charge Voltage
20
End of Discharge Voltage
20
Discharge Rate
20
80%, 60%, 40%, 20% Capacity Voltage Levels
21
Balance Parameters
21
Start Voltage
21
Delta to Balance
21
Balancer Enabled
21
Balance Only When Charging
21
Other Parameters / Features
21
Switch
21
Load Detect
21
LED Enabled
22
LED Capacity
22
BMS Name
22
Barcode
22
NTC Settings
22
4 Periodic Maintenance
23
Periodic Cable Check
23
Periodic Voltage Check
23
5 Troubleshooting & FAQ
24
6 Technical Support, Return, and Refund Policy
28
Appendix
29
Appendix A: Recommended Parameters
29
General Settings
29
A.2: 12V Pack, 4 Cell, Using One 12V BMS and 100Ah Lifepo4 Cells
31
Mechanical Drawing
31
Bill of Materials
31
Wiring Diagram
33
BMS Configuration Parameters
33
A.3: 12V Pack, 8 Cell, Using One 12V BMS
35
A.4: 24V Pack, 8 Cell, Using One 24V BMS
38
A.5: 24V Pack, 8 Cell, Using Two 12V Bmss
42
Appendix B: Calibration
43
Voltage Calibration
43
Current Calibration
44
Idle Current Calibration
44
Charge Current Calibration
45
Discharge Current Calibration
47
Appendix C: about Cell Balancing
49
Appendix D: BMS Specifications
55
Pinouts
56
BMS Balance Connector (12V)
56
BMS Connector
56
BMS Serial Interface Connector
57
BMS Switch Connector
58
BMS Temp Sensor Connector
59
Appendix E: BMS Application Usage
59
Xiaoxiangbms (Iphone)
59
Xiaoxiang (Android)
60
Jbdtools (PC)
63
Appendix F: Wire and Lug Sizing
66
Wire Sizing Chart
66
Battery Bus Bar Sizing Chart
66
Appendix G: Glossary
67
Appendix H: Further Reading
68
Mobile Solar Power Made Easy! by will Prowse
68
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Overkill Solar BMS Series Specifications
General
Brand
Overkill Solar
Model
BMS Series
Category
Control Unit
Language
English
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