I have built a li-ion 18650 7S pack as my solar backup. It is being charged by 3*250W solar panels in series (about 105V 8A.)
My charger doesn't have an option to monitor individual cell voltages. It just charges the battery pack to the given voltage (4.2V*7 = 29.4V.)
I have a BMS monitoring my pack and if a cell goes above 4.2V it generates a signal which I monitor using an ESP32.
What I want to do is turn off solar side if cell goes above 4.2V with that signal.
Can Mosfet do this job or is there a better way to achieve this?
Note: The BMS has overvoltage cutoff but if I connect the solar charger through the BMS, it cuts off the battery power to the controller while PV side is on. The controller manual clearly say that cut PV before battery.