you will get the charger controller regulator. function of the battery control regulator is set to come out of the module volt solar panel so that out of the heat volt solar panel
does not exceed the limit.EXAMPLE: you have a solar panel
with 12 volt input then you must also have a battery control regulator with 12 volt input. Heat gained from solar panel modules could exceed that limit could be up to 17 volts then to anticipate the damage to the battery or car battery control regulator is required to heat can be regulated
so as not to damage the 12-volt battery