I have a cheap solar charger like the one below and I was wondering if there is a way to integrate this into esphome to read the solar charge volage and battery readings
I am going to assume not as i can’t find anything via google so I will have to build something if i want this info
Just make a voltage divider with two resistors and read the voltage with analog pin.
For 12V battery, you could use 10k and 33k resistors.
Yeah a voltage divder is easy to do but if this controller already does these measuments I was just curious if there was an easy way to get them. I take it that this is not available via usb…
I might get another and take one apart ans see what ot is doing.
In the name of hacking. 
It takes 100x time to study the charger circuit than measuring the voltage.
I would be 100% sure the USB port is charge only, no data.
I wouldn’t take a risk even to try to connect that to my computer…
Or a battery. I had one that looked very similar to that which fried a battery.
How did it fry the battery?
It appears the regulator failed in short circuit and it applied full solar panel voltage to the battery. Happened within weeks of installation.
In My search around to see if there was a way to do this with teh cheap controller I have I think I found something that will work, the Victron solar charger seems to fit what i want. And it is not that much more expensive.
Although not complicated to do voltage measurement this will give me a little more info and also some automation features, and make my circuit less complicated and therefore less likely for mistakes 
An in light of certain comments I have seen about issue with the cheap controller, it might be a safer option
Good choice!
