I have an existing off-grid solar system that currently uses (16) 230ah 6v lead-acid batteries that are near the end of their life. I would like to replace these with some pre-made lithium iron phosphate batteries, and have been making some inquiries on Alibaba. The problem is, I'm relatively clueless of what I need for replacement batteries, and can use your advice. My current system is 48 volt, using a Schneider SW 4048 inverter/controller, and is tied to (12) 330w solar panels. It's in Baja Sur, Mexico.