A few thoughts :
Firstly you'll need to calculate the total expected current load for all devices, and those in the future, that will not only include the obvious devices, but also things like lighting, dehumidifiers ?, security, roof-openers etc.
Once you have it then you'll either double, treble or even quadruple the figure depending on how many days you expect to run without being able to charge the batteries. Being Solar charged you are very much prone to the vagaries of the weather, but this can be augmented with mains chargers, which then negates the purpose of the exercise .....
Once you have your figure, you can then work out the number\type of batteries you require. These could either be deep cycle, lead acid or tracer type (with spares ?), but in any event you will need to then physically find space, securely and safely fit them, together with their charging\control system.