Hello everyone. I have an circuit similar to the given photograph the difference is that the load's negative is being triggered through the P55NF06 mosfets and the negative of the solar and battery is being differentiated bt pc807 optocoupler. I want to know what is the need of these mosfets for triggering the load what if we direct connect the load with the circuit.

 

That's just a simple window comparator using a Lm358, No Mosfets?

 

I have another circuit which is similar application with attached circuit which is having mosfets