I have 8 shelves of 1600x600mm that we want to mount on the wall. The suggestion I've received is to have 3 C-profile rails 1000mm/shelf and 570mm C-brackets (also 3/shelf). The shelves will be placed in two tiers and the total length will be 6400mm/tier. What is the maximum load each shelf (1600mm) can handle with the proposed C-rails and brackets? Of course, fasteners, wall, attachment points, etc. play a role, but I hope to get an idea of how much the shelves can handle.
I am quite sure that what limits the load on each shelf is the capacity of the brackets. The shelf manufacturer Pelly has a brochure called "Tips and Advice" (couldn't download it right now). It states the capacity of the different brackets. If each bracket supports 50 kg, then a shelf can support 3x50, i.e., 150 kg. Then, it's important that the screws holding the rails match the load, but that's quite likely. However, this depends on what the wall looks like and which screws you use. Divide the maximum load for each shelf section by the number of screws to see what each screw must support in the vertical direction. You could complicate it further, but I don't think it's necessary here.