BMS circuit for 1.5v cells

hi
i am traing to do a BMS circuit for 3 1.5v batteries and and am using 1.5v solar panel for charging,and i wan to use the 3 batteries as source for another circuits
there is schematic

and whenever i do am not getting the 1.5v for single battery, and am getting fix total of 2.96v

need some help to get it right

Please explain how you think a 1.5V panel will charge a 4.5V series battery connection.

What is the function of the LM317?

according to this tutorial Homemade BMS - Balanced LiPo Charger Multiple Cells and Current Limit - YouTube we can charge 3 3.7 batteries using 5v generator

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