With respect to your original question on data display I would like to offer an alternative approach. Rather than purchase an off the shelf solution - usually quite expensive - I suggest you just make your own! The basics - say a shunt on the batteries and a MODBUS data connection into your solar charge controller are available at very low cost (<$50) and offer essentially unlimited capabilities all with no cost tools. I'm not saying it will be easy but it will be cheap and you will end up really knowing what is going on with your system. If you are at all technically inclined I'm sure it is achievable. Something to consider...