10-02-2017, 02:51 PM
There are better options than the 18650 cells for a bulk storage. If your thinking about going that route google prismatic lifepo4 cells.. they can be had in many capacities from 10-300ah per cell, many are rated for 1c charge and 3c discharge and rated for greater than 5000 cycles at those rates with 80% capacity remaining. They will run slightly higher in cost than nano carbons when you compare useable AH (50% dod on nanos). There is debate about BMS longevity in all lithium battery packs, personally I have had more failures due to BMS than cells, and 80% of the cell failures were due to failed BMS. There are variables that need to be considered before going that road, but it’s not difficult or scary and can be a very reliable long lived solution.