Bottom mount rail, also known as H rail, used with clamp, average structure cost per watt can be half of conventional side mount railing system, when need an L connector.
H rail strength is lighter than conventional side mount rail though.
Suggest wind speed below 40m/s.
The type of clamp is optional according to the roof.
Standing seam roof clamp works out non-penetrating installation. Bottom mount rail is H shape (SR-RH4), sit on the top area of clamp saving cost of connector.
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