Abstract: A PV module frame, includes a module recess, a sidewall vertical to the module recess and a bottom portion vertical to the sidewall. The bottom portion extends from the bottom of the sidewall along the opposite direction of the recess of the module recess. A PV module having the PV module frame and a PV module installation system for installing the PV module onto a support, wherein the bottom portions of the adjacent solar cell assemblies are socket jointed and fixed to at least one installation beam which is fixed to the support. The beneficial effect of the present invention is that: fast installation of a PV module could be realized only by using the improved frame and one installation beam, Which reduces the quantity of the members in an installation system module and makes the installation more efficient, easier and more economical.

Abstract: The present invention discloses a PV module frame, comprising: an module recess, a sidewall vertical to the module recess and a bottom portion vertical to the sidewall. Said bottom portion extends from the bottom of said sidewall along the opposite direction of the recess of said module recess. The present invention also discloses a PV module having said PV module frame and further discloses a PV module installation system for installing said PV module onto a support, wherein the bottom portions of the adjacent solar cell assemblies are socket jointed and fixed to at least one installation beam which is fixed to said support. The beneficial effect of the present invention is that: fast installation of a PV module could be realized only by using the improved frame and one installation beam, which reduces the quantity of the members in an installation system module and makes the installation more efficient, easier and more economical.

Abstract: A bonding washer for making electrical connection between two metal pieces that are to be mechanically fastened together. The washer, to be interposed between the two metal pieces, is constructed so as to fasten to one of the pieces before the two pieces are joined. Teeth on the washer, positioned at right angles to the plane of the washer, are forced into each of the two metal pieces when the fastener is tightened, making electrical connection between the two metal pieces.

Abstract: An insolation survey device consisting of a panoramic head mounted on an additional rotational stage. In operation, the entire assembly can be leveled. The additional rotational stage then allows the panoramic head to be aligned to north without affecting the level. The panoramic head accepts a digital camera as attachment. Pictures taken at intervals can be combined into a panorama and analyzed for shading factor.