BMS
For the controller I also have all the components except for one of the three relays. The two I installed are for controlling a Blue Sea Systems Remote Battery Switch (RBS) and the one I will install later is for controlling the active balancer. This PCB has many more components
BMS
We’re back in Florida so projects can resume! Surprisingly I had enough parts to build one complete cell board, which is now ready for testing. The empty DIL-8 socket is for the ATtiny microcontroller, which I program out of circuit. The RJ11 socket is for connecting these boards in
BMS
This morning I received the JLPCB shipment from Fedex. They look fantastic, better than anything I made before and they are cheaper than anything I made before, even my DIY PCBs. Below some more pictures incl. screenshots of the production timeline and shipping progress. You can see that they did
BMS
Above an impression of the finished PCB design for the main controller module. About half the board is taken by the ESP32 module with POE Ethernet port; the other half has two relays and an optocoupler to interface with the Remote Battery Switch, another relay to interface with the active
BMS
I finished the design for the controller board. It uses the Waveshare ESP32-S3-ETH module with the POE power over ethernet module. This module has an Ethernet port that will be available on the outside for connecting it to our network switch. The POE converts to 5V power and the module
BMS
My reason to use the ATtiny85V microcontroller is that it has a power-down sleep mode where it consumes as little as 1 µA, which equals zero for any practical purposes. The reason for consuming anything at all is that we can wake it up by changing the state of an
BMS
Last year I designed BMS v2 and built a prototype that worked great. I continued to design the circuit boards, finished that and then never actually ordered them… because I didn’t like the large size and mass of cabling. What I liked about the design is that it uses