Just one head-scratcher remains: why the monitor on the battery reports ~0A when the battery is discharging.

Negative power while the battery charges makes sense since the battery is receiving power rather than supplying it.

The server rack uses a combination of mains power (supplied by a 5kW solar inverter), grid power, and its own DC solar PV array during the day, but once the solar mains inverter stops producing more than 200W, mains power is shut off to the server rack… so it is forced to run off the batteries at this point.

The battery's output should be equal to the server load… but instead that INA219 reports ~0A.

Anyone have a clue what's going on there?

#INA219 #electronics

The Heltec #ESP32 Lora v3 uses #TP4054 with 2K PROG resistor so it only supports 0.5A charge current which would give roughly 2W max. This is why I'm planning on connecting ESP32 to the 5V output of solar FP6276B and let it buck-convert to 3.3V via CE6260B33M.

I'm wondering if it would be possible to somehow measure the charge current and report that via the Lora node? Is #INA219 the only option?

@rabid_inventor @foosel
Not only it doesn't respond, but I have also an #INA219 current sensor, to measure the solar input and it stopped working too.

So probably it messes with the whole I2C communication.

The sensor did fine until after some days with rain, which shot up the humidity. Unfortunately Home Assistant doesn't keep all the logs so here it's from last week.

I guess I shouldn't buy cheap sensors from china.

#BME280 #arduino #esp8266 #esp32 #homeassistant