I am an electrical engineering student doing a work term for a university doing magnetic field research and building a remote monitoring station to be put in the field. Despite my couple years in school, I have very little practical knowledge of power systems and the way they work so I would appreciate any guidance you could give me.

I have a solar panel and turbine leading to a charge controller (Phocus CIS-N). This powers the two 12V batteries in parallel and the load output leads to my main breaker. With this system I have to power:
Power Supply Unit ( 12V 1.25A )
BulletPlus Modem ( 12V 2A )
BeagleBoneBlack ( 5V 2A)
I have a CUI Inc 12V to 5V converter that outputs 5VDC 3A to power the BeagleBone. I have attached a rough drawing of the circuit if it is easier to visualize.


I am very new to power calculations and have never set up a circuit on my own so I am wondering if there is someway that I have to limit the input current into my devices or if they will only draw what they need. I realize that this might be a really simple question but I have almost no experience with power circuits.

Thank you in advance

 

All devices will draw the current that they need to supply.

 

All devices will draw the current that they need to supply.

Ok, that is helpful to know, and should I add any fuses or fail safes into the circuit?

 

Always good practice to put fuses or breakers in.