Best advice I got when starting to design my electrical system was to create a power budget first... figure out in watts how much energy you need for the things you want to have. Then from there calculate out how much battery storage and solar capacity you need (again, in watts). Then shop for materials and decide on 12/24/48 volt. If the financial figure is too high, start scaling back power-consuming devices in the power budget and recalculate your capacities.
That power budget is hard, you have to figure out what all you're going to have, find its power usage (or measure it with a kill-o-watt if its something you already have) then decide how often its going to run. Worth it in the end though.
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