Hi Dave, I hope that all is well in your part of the World. If your system is higher than 12 volts, I would be reluctant to use automotive fuses as they are not designed to quench arcs at higher voltages. There are DC fuses and circuit breakers for higher dc voltages but they are a bit more pricey. For tiny 12VDC systems, I have simply used inline fuse holders attached at the battery. For me, as a simple rule, I try to fuse all power sources, panels, and batteries, as near to the power source as possible just in case of line shorts or mischief, although the tiny 12V systems I just installed in the Philippines were fused only at the battery. Rich