I have a basic understanding of how to size fuses used for individual components within the system. But I want to verify the proper way to size the main fuse that is between the positive cable off of the battery bank and the main positive busbar. Attached to my busbar will be two cutoff switches - one leads to the inverter and the other leads to the DC fuse boxes (for my 24V system I will have a 24V fuse box and a 12V fuse box). The MPPT charge controller is also connected to the busbar. There are of course separate fuses for each of those components (which I better understand how to size).
What is the general formula and set of variables needed to calculate the main fuse? Is it the usual calculation but based on a total sum of all possible loads? Is it a sum of the other fuses (indirectly) attached to the busbar? Is it based on the batteries in some way? And of course the wire size has a role since that is what the fuse protects.
I'm not looking for a specific number, but the set of variables and general formula used to determine the fuse size.
What is the general formula and set of variables needed to calculate the main fuse? Is it the usual calculation but based on a total sum of all possible loads? Is it a sum of the other fuses (indirectly) attached to the busbar? Is it based on the batteries in some way? And of course the wire size has a role since that is what the fuse protects.
I'm not looking for a specific number, but the set of variables and general formula used to determine the fuse size.