Michel
New member
- Joined
- Apr 30, 2018
- Messages
- 14
Hi Everyone,
Like many of us whom are looking to buy or make a simple BMS which would monitor and (passively) balance cells in our powerwall I've been playing with the idea to make my own based on ESP8266 modules. I've seen the DIY BMS that Stuart Pittaway has been working on but I find it way too complex and almost impossible for the average joe to make.
I'm looking forward to make a DIY BMS that's:
Each 1s module would have one board with the following components:
1 * ESP8266 D1 Mini (SOC)
1 * MCP1700-3302E/TO (3.3v regulator, regulate input/battery voltage to 3.3v for ESP)
2 * FK28X5R0J105K (1u 6.3v Capacitor, regulate input and output for/from MCP regulator)
5 * SFR16S0003300JA500 (330 Ohm resistor, for voltage divider and LED's)
2 * 1 Ohmn 20W Ceramic Resistor (For balancing/discharging)
2 * BUK98150-55A/CUF (N-Channel Mosfet, to switch resistors on/off)
2 * LED (as an indicator if resistors/balancing is active)
The primary function of the ESP8266 will be monitoring the voltage (to grafana) and activate the resistors when the battery surpasses a certain voltage (first resistor at 4.1V, second at 4.15V for example?). Since it's a SOC the software can be modified and improved over time.
I have little to no experience creating my own circuit, so this will be my first try, kindly please have a look at my plans, and if you have comments/suggestions please do share them.
Like many of us whom are looking to buy or make a simple BMS which would monitor and (passively) balance cells in our powerwall I've been playing with the idea to make my own based on ESP8266 modules. I've seen the DIY BMS that Stuart Pittaway has been working on but I find it way too complex and almost impossible for the average joe to make.
I'm looking forward to make a DIY BMS that's:
- As simple as possible
- As little different components as possible
- Software programmable/WiFi manageable.
Each 1s module would have one board with the following components:
1 * ESP8266 D1 Mini (SOC)
1 * MCP1700-3302E/TO (3.3v regulator, regulate input/battery voltage to 3.3v for ESP)
2 * FK28X5R0J105K (1u 6.3v Capacitor, regulate input and output for/from MCP regulator)
5 * SFR16S0003300JA500 (330 Ohm resistor, for voltage divider and LED's)
2 * 1 Ohmn 20W Ceramic Resistor (For balancing/discharging)
2 * BUK98150-55A/CUF (N-Channel Mosfet, to switch resistors on/off)
2 * LED (as an indicator if resistors/balancing is active)
The primary function of the ESP8266 will be monitoring the voltage (to grafana) and activate the resistors when the battery surpasses a certain voltage (first resistor at 4.1V, second at 4.15V for example?). Since it's a SOC the software can be modified and improved over time.
I have little to no experience creating my own circuit, so this will be my first try, kindly please have a look at my plans, and if you have comments/suggestions please do share them.