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Buck or boost for charging a battery

If I have a deep cycle battery and I want to charge it using MPPT method from the solar panel. There will be some time in a day where the voltage from the solar panel will be less than the voltage of battery, in this case the buck converter will not work? and maybe this will make current flow in the opposite direction damaging the solar panel. Do we have to maybe use buck-boost converter instead?
 
You should use a decent MPPT controller that has built in reverse current protection ... any good unit will have it
Thank you for ur answer, I will be designing this MPPT controller and will consider the reverse current protection. but I want to know the best option for cases where the output voltage is less than the input, which creates a problem here. Maybe in using buck-boost with MPPT method? but I am not sure if it is possible or not
 

davenn

Moderator
Maybe in using buck-boost with MPPT method? but I am not sure if it is possible or not

that would require some fancy switching for it to detect input voltage level
tho they may exist, I don't know if a buck-boost unit that will do that
 
that would require some fancy switching for it to detect input voltage level
tho they may exist, I don't know if a buck-boost unit that will do that
I think I have to do more research about this.

Thank you, davenn for ur answers
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
If you use a flyback inverting topology it won't matter if the panel voltage is higher or lower than the battery voltage.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
The key point is "inverting". This allows you to do buck or boost with a very simple topology.
 
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