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Thanks for your answer. Looking at this today I realized that this is an opportunity to simplify and improve things. I found a really reasonable 36v/50ah LifePO4 Battery with BMS and High/Low Temp ($280 and 20kg vs the 210lbs plus (3) 100ah Lead Acid Batteries I have now!) Also sourced a used...

Although admittedly not common for off-grid solar, 36v/3-12v series battery systems are extremely common for marine trolling motor applications. I'm trying to figure out the most cost effective way to recharge (not just trickle/maintain) a 50ah system that will be used 2-3 hours then stored for...