In that case you d get a charge controller rated for 30 amps.
How to charge 12 volt batteries with solar panels.
For example if your solar panel is 300w and you want to charge a 12v battery you d divide 300 by 12 to get 25 amps.
3 choose an mppt charge controller for better efficiency.
For an effective charge you need to make sure that the panel is directly facing the sun and no obstacles in between.
Keep your 12 volt battery topped off with a 12v battery with solar panel charger in all seasons.
If you re concerned about performance and speed invest in a 16 volt solar panel instead.
12v battery with solar panel.
Wiring pv panel to charge controller 12v battery 12vdc load.
Therefore never connect your solar panel directly to a battery it could be overcharge the battery and damage it.
In order to charge a 12 volt battery efficiently you ll need a solar panel that produces 12 volts.
12 volt solar panel system convert 17 volt to charge your battery.
In this simple solar panel wiring tutorial we will show how to connect a solar panel to the solar charge controller battery and direct dc load according to the rating.