have you decided on your setup? (Fuso is 12v)
Pretty much, but I have yet to buy some of the hardware.
I have 400A of LiFePO4 batteries and will have 400W of amorphous (UniSolar) solar panels on the roof.
To get the same "usable" output from AGM batteries I would need about 900A. My 400A weighs just under 60KG. That is the batteries themselves and the restrictive mounting enclosure I built for them.
My preference is to charge the batteries at 14.0V, which means that I need to reduce the output of my alternator in order to do that. Sterling Power now make a 120A step down charger. This makes it relatively easy to charge the LFP batteries from my alternator (as well as solar). There are other safety mechanisms that should be included in any LFP setup, but these are not rocket science, despite what you might read online.
The biggest problem with LiFePO4 batteries, as I see it, is the lack of "real" information about them. Nearly everyone I have spoken to, from a commercial perspective, make out that they are dangerous and very complicated to setup. I totally disagree with that, as I am sure a few others on this forum would do (I know Shan and Alastair both have LFP setups).
Each to their own, but my personal opinion is that lithium batteries are the best solution currently.
Less weight, smaller physical size, higher resting voltage, no discernible voltage drop from 100% to 20% SOC, the ability to handle high current loads with ease, longer life, faster to charge and the list goes on.
The sticker shock for LFP batteries, and all of the associate equipment required to make a viable "LFP system", does turn people away from them, but if you do the math, usable amps per dollar spent is still better over the life of the batteries.