I think one of the most important items you can install is that shunt based battery monitor!!! - that you already have (and should have been installed a long time ago.
That will tell how how much power you are making and how much you are using. Something is not right in your system.
With that much solar and batteries, you should have no issues making it through the night.
One other tool that you probably need is a Digital Multimeter with clamp on current like this:
Klein Tools CL320 Digital Clamp Meter, HVAC AC Auto-ranging 400A, AC/DC Voltage, TRMS, DC Microamps, Resistance, Frequency, NCVT, Temp, More https://a.co/d/iPx4kRP
I have a Klein like that one - there are other cheaper ones - I just don’t know how good they are.
With this you can see how much current is flowing down a wire for example:
It’s sunny and I should be making lots of solar power - but is the current flowing? Now you can know.
You need some trouble shooting in your system- is power flowing to the first battery - is it flowing to the last battery- are those two current amounts the same?
Good Luck
That will tell how how much power you are making and how much you are using. Something is not right in your system.
With that much solar and batteries, you should have no issues making it through the night.
One other tool that you probably need is a Digital Multimeter with clamp on current like this:
Klein Tools CL320 Digital Clamp Meter, HVAC AC Auto-ranging 400A, AC/DC Voltage, TRMS, DC Microamps, Resistance, Frequency, NCVT, Temp, More https://a.co/d/iPx4kRP
I have a Klein like that one - there are other cheaper ones - I just don’t know how good they are.
With this you can see how much current is flowing down a wire for example:
It’s sunny and I should be making lots of solar power - but is the current flowing? Now you can know.
You need some trouble shooting in your system- is power flowing to the first battery - is it flowing to the last battery- are those two current amounts the same?
Good Luck