The charge controller is really just a voltage regulator for the solar panel to prevent over charging the battery.
The solar panel at peak power will deliver 17.1 volts, too many volts for a 12 volt system.
So the charge controller will reduce the voltage to a maximum of around 14.6 volts, monitor the battery voltage, reduce the output both voltage and wattage to prevent overcharging the battery.
I have installed a simple MorningStar ProStat 15amp maximum solid state controller.
Mounting the controller in a cabin that carries lots of stuff from time to time I wanted something quite rugged to protect it from being bounced around.
So, I looked around among my extra stuff and found an ammo can that would work perfectly.
|ammo can with hole|
Since I like to monitor the battery voltage, I made a hole in it to install a digital voltmeter to know what the voltage is at anytime.
The leads are long enough to be able to move the unit to another location, (as in outdoors), the can is sealed and I can use the unit in wet outdoor weather, the wires have connectors so it can mobile.
There are times when I would like to use another solar panel, that is sitting on the ground and need a controller to run that one.
Another thing I like about the "Ammo Can Box" is that it is somewhat .... EMP proof (just in case ;) )
Coming next the Battery