I caught this thread a little late, but I have a hard number to be used in this discussion. We have worked with a umber of AHJs about the dead load of a PV system, and we routinely quote 2.6 lbs/sq-ft. This based on the actual module plus hardware weights for an array of four (4) BP Solar SX3200 modules, six (6) ProSolar 4-1/2" Fast Jacks, six (6) Oatey flashing (plus caulk), six (6) ProSolar mid-clamps (with channel nuts), four(4) ProSolar end-clamps (with channel nuts). The total weight is 157.8 lbs and the "array size" used is the full rail length times the long dimension of the module, 62.8 sq-ft. We did not include wire, conduit, pull boxes or anything of the like, as these components are not typically found "underneath" the PV array. Tilt racks would weight more. Larger arrays may actually come in at a slightly lower weight per unit area.
- Peter Peter T. Parrish, Ph.D., President California Solar Engineering, Inc. 820 Cynthia Ave., Los Angeles, CA 90065 CA Lic. 854779, NABCEP Cert. 031806-26 <mailto:peter.parr...@calsolareng.com> peter.parr...@calsolareng.com Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
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