TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Method: The diode comprises bypass diode (32) and/or blocking diode, and the detecting comprises monitoring a passive device and/or an active device within the photovoltaic modules or an array to assure proper installation, commissioning, operation, maintenance, reliability and/or safety. The method further comprises correcting or repairing or replacing at least one of the photovoltaic modules upon detecting a failure of the diodes, where: the failure of the diodes occurs due to reverse current flow, improper electrical connection, cracked solar cells, mismatched solar cells, shading of solar cells, improper fusing within the photovoltaic module, improper grounding of the photovoltaic module and/or improper fusing outside the photovoltaic module; a technician or an installer performs a check of an array of the photovoltaic modules by visually inspecting the temperature indication devices while traversing a portion of the array during or after installation; visually checking comprises easily observing a front portion of the photovoltaic module without physically opening a part of a photovoltaic module; and detecting the failure of the diodes comprises monitoring an approach to a temperature rating of the diodes, or monitoring a rise to or above a temperature rating of the diodes, where the temperature rating of the diodes is 125-300 degrees C. The method further comprises mounting photovoltaic modules to a support structure, and electrically connecting the photovoltaic modules. Preferred Components: The module further comprises at least one electrically conducting boards disposed between the transparent front sheet and the back sheet, and the portion of the electrical circuits mounted to the electrically conducting boards, where: the diodes mount to the electrically conducting boards laminated between the transparent front sheet and the back sheet with the diodes facing the solar cells; and the temperature indication devices mount to the circuit board on a same side or an opposite side as the diodes, where the temperature indication devices provide visual indication related to a temperature of at least a portion of the electrical circuits. The diode comprises surface mount technology Schottky diodes integrally laminated into a portion of the photovoltaic module. The temperature indication device comprises: reversible temperature indication devices, non-reversible temperature indication devices, active temperature indication devices and/or passive temperature indication devices; a scale to illustrate a temperature or a color change to indicate a certain threshold temperature has been reached; temperature sensitive material that visually changes color or visually changes shape upon exposure to a threshold temperature or threshold temperature ranges; a thermotropic liquid crystalline polymer; and a temperature indication label, a temperature sensitive paint, a temperature melting material, a temperature softening material, a temperature activated cement, a temperature activated lacquer and/or a temperature activated crayon. The solar cell comprises Czochralski silicon, float zone silicon, monocrystalline silicon, near monocrystalline silicon, microcrystalline silicon, multicrystalline silicon, geometric multicrystalline silicon, amorphous silicon, cast silicon, sheet silicon, ribbon silicon, cadmium sulfide, cadmium telluride, copper indium selenide, copper indium gallium selenide, germanium, gallium arsenide, organic materials and/or polymer materials. The electrical circuit comprises the diodes and the temperature indication device comprises active device and/or passive device. EXAMPLE - No suitable example given.