Update:
As they say idle hands make a devils workshop so as I am waiting for my Lexan side covers which have been cut by my glass shop.
I now need to prepare them to mount to the battery packs, and I need a couple of hrs in the glass shop to cut holes and do some fine tuning.
That will probably happen this weekend.
In the meantime I am planning for the enclosure that I will place these batteries into.
Since I live in Maine and the temperature can go from one extreme to the other and the batteries are going to be in a shed and not in a "climate controlled environment" I need to take some things into consideration. Heat and Cold.
So with my limited knowledge of microprocessors I went to work.
My idea is to build a box to house the packs into that has some form of temperature management.
For the heat management the box will have 3 flaps/vents 2 on the sides and 1 on top. Under the top flap/vent there will be 2 or 3 fans.
The flaps/vents will be servo controlled and open around 23 C and the fans will kick in around 28C. I have not decided if I will PWM them for speed control relevant to temp yet but I am considering it.
For the cold management I will install 2 incubator heaters to maintain the box temperature at a minimum of 2C
The system will be managed by an esp32 module that will control 3 servos and 2 relays to accomplish this. The system will be independently powered by my secondary 12V solar system. The shed has its own solar panels,charge controller and AGM batteries (To be replaced with Li-io in the future)and is responsible for its own power consumption.
The first challenge was to get the esp32 to do all that which I have accomplished.
It has a DHT11 sensor (which will be replace by a DHT22 for greater temp range capabilities) for temp and humidity it is a rather slower reacting sensor so the servos and fans don't constantly kick in and out at the threshold temps. I suppose I can also debounce the readings in the sketch.
It has a 0.96in OLED attached soon to be replaced with a 1.3in OLED to display the status of the battery box and it also sends data to my influx db so the parameters can be monitored remotely.
Don't laugh at the breadboard but the prototype works.
Also the influx data visualized in grafana.
That's it for now
Wolf