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Car battery monitor wifi12/24/2023 ![]() ![]() An esp32 would probably be a better idea, or maybe an i2c adaptor. Using an ESP8266 is a bit of a pain for trying to do this as it only has one Analog input though. 100A range would likely do, and it gives 0-10V out. I have bought a range of current measuring sensors, and something like the hall effect CT is what I’ll be using. Measure current in and out of the battery.This is no doubt similar to other EVs though, and maybe newer cars just charge the 12V quicker when charging is possible. It is sad really that they have to keep the HV and 12V system completely separated, as there are times when the 12V battery (around 1kWh of storage) can go flat even though the car main drive battery (24kWh) is full. Leaf 12V batteries seem to quite commonly be the cause of issues, and especially when they have been sitting unused for a while. Obviously this should be better than ICE vehicles, as they also only when the engine is on. the drive battery is on charge) and also when you are actually moving. They charge when the car is charging (i.e. I have a Nissan Leaf, and they seem poorly designed to keep the 12V battery topped up. Use low power (and deep sleep mode where possible) to avoid draining the battery further. ![]() Sending regular reports to MQTT (say, every 10 mins).A calibrated measure of the battery, which could be up to 15Vdc.Using the Analogue input on an ESP8266 and voltage divider to monitor the status of a 12V battery in a car. V1.2 Minor changes to the ESPHome yaml & notes… (I built a second one for another vehicle) Summary V1.1 Addition of some graphs showing voltage measurements ![]()
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