BAT1 is the battery in the front of the van which was build in. It is being charged by the alternator while the car engine is running. This also turns on the 12V 70A relays which usually means that it also charges BAT2.
I ran this for a while. But then BAT2 basically died. This could be because I overdischarged it, but makes me worry.
Sidenote: The two appliances FRIDGE1 and LS1 are examples. In reality there are more.
Today I checked and with mild sunshine at an okay angle, the 2x(12V 100W) solar panels were delivering around 15V 0.1A. So there is a problem. Do you have any idea how I can figure out what that problem is?
The ground is the hull of the van. Is that an issue that everything is connected like this??
More information was requested. The black image between the labels Bat and Load depicts a solar charge controller (30A max). I attached a bluetooth reader to it. My readings come as information from the charge controller and a multimeter. I used the multimeter only to measure voltage.
-15.5 V (can be more sometimes, but not significantly)
-set up in series as depicted
-14.4 V max (while car engine is on), 12.2-12.9 V otherwise
-the 160Ah hour Calcium Battery is still good enough for making a coffee☕, but the voltage drops significantly when doing so.
-I plan to exchange it with a lithium battery. But before that I want to make sure that my setup doesn't break it.
-60Ah Lead battery under the hood -12.39V (single measurement with multimeter yesterday)
To precise my questions:
- Is it okay to connect everything to the same ground like that?
- How do I "debug" my solar setup to figure out what's wrong?
If there is anything else missing, please clearly tell me what that is.