6v 300mah solar panels for individual cell balancing?

[novembersierra28]

Need some help figuring out how to wire these into a bms for safe high voltage cutout at 3.6v for lifepo4.

Reason I went for 6v is they work fine in the shade at above 4v... but in direct sunlight you're looking at serious problems with overcharge

[Jeremy Harris]

The simple way to do this is to use a shunt regulator set for the maximum cell voltage you're looking for.

If it were me, then I'd just hook up an LM431/TL431 shunt regulator across the solar cell, with an external transistor to increase the current handling capability.

If you take a look at the original Fechter/Goodrum/McCree BMS circuit you will see exactly what you need, just use the shunt regulator part directly across the solar cell - you don't need the opto-isolator or the LED.

Jeremy