solar generator

I am gathering information on solar power so I can build a small generator as an emergency backup. This backup will be small at first, just looking for some power for lighting or maybe a small tv or something for a couple hours. I would like to add on to this project later to add more power. I am thinking of starting with two 12v AGM batteries (one 69A and one 34A), a 25A mppt cc, and a few solar panels. Was thinking of going with two 24v panels as someone said these will charge the battery bank faster...is this true? and can I use 24v panels and 12v panels together in the same array? Any help would be greatly appreciated as this is all new to me!