If I could get from you more specific details on your system as you have it now and how you use would be great.
Also, think about what things you may need or want your system to do in the future.
What are your input charging sources, so, total solar capacity, other sources you may wish to monitor, wind, hydro, nuclear?
Your battery setup, cell voltage, number of cells, Amp/hr capacity of each cell, battery configuration (parallel or series)?
Will the monitoring system be powered from the battery direct or via inverter?
Does inverter go into pulsed standby mode or is it always online?
We need to determine that you have available capacity in your existing system to operate such a monitoring system, even though the little Arduino doesn't consume a lot of power, we need to be certain you have the battery capacity to run this 24/7.
Are you thinking of web based display or just a local display or both?
Having all this information beforehand can help you understand better how to design a suitable monitoring system.
There is probably little point banging something in either thinking or hoping it will work.
If you can put together such a list Randy we will be better able to assist you in your endeavour.
Just ask if you find something you don't fully understand, there are plenty here who are willing to help.
What parts do you have so far, or are we starting with a blank sheet?
For my project, I recently bought and have made ready to install one of those 50 Amp Allegro hall effect sensors.
I bought the 50 Amp uni-directional. On that link you provide in your first post, there is at this point in time one available, might be worth grabbing if you don't already have one. The one I bought was not on a PCB, just the chip, so I mounted it in a good sized DIN rail terminal fuse, a pretty good fit actually. I have photos I'll try to get off my smartypants phone if I can. This sensor will go inline with my inverter in the coming days so I will then be able to see and monitor the current from the battery to inverter.
lndk, bon projet, though I have to say providing links as you have is most likely not going to help Randy.