Fred had some really great thoughts. One thing to add.

Fast blow versus slow blow? Slow blow seems like the easy way to
helping to prevent blown fuses. Slow blow (slo-blo) fuses were
created to handle devices with high "inrush" currents. That is, when
you turn on this type of device, there is a high initial current draw
for a short period (maybe 1-2 seconds) which settles down to a lower
level. Simplistic examples are motors and incadesent light bulbs.

Do you have any devices in your glider that need a slo-blo? Highly
doubtful. I don't know of any "modern" (last 10+ years) avionics/
instruments that need slo-blo. I don't use any. Check the manual on
all your devices to be sure.

Finally, as to using one fuse total or using one fuse per
device...this is a question in which you will get equal proponents on
each side. I prefer one fuse directly at the battery. I run two
batteries.

My $0.02.

- John DeRosa