second example solar collector arrangement 50 with an array of photovoltaic modules 52 supported by a roof as shown the modules 52 may be installed flush or relatively close to a roof plane 54 photovoltaic modules are typically packed and shipped in cardboard boxes as depicted in fig3 multiple boxes 302 are generally stacked on top of each other and shipped together as a unit the stack of boxes 302 are typically strapped to a wood pallet 304 and shipped together as a unit two solar modules may be included in each cardboard box with a cardboard sheet between them another packaging solution for solar modules is depicted in fig4 this solution uses corner elements 402 to support and stack multiple modules 404 on top of each other the stack with the corner elements is then strapped to a wood pallet 406 and shipped together as a unit applicants have determined that these conventional packaging solutions have disadvantages and inefficiencies the conventional solution of packaging the modules in cardboard boxes results in extra cost for the boxes in addition there is substantial work needed to unpack the modules and recycle the boxes at the installation site for example in a large installation there is typically a worker dedicated to this task on unpacking and recycling boxes furthermore the cardboard material takes up space in a stack of modules being shipped and so reduces the shipping density of the modules a lower shipping density means that fewer modules may be shipped in a fixed.