NCCER Solar PV case studies
NCCER Solar PV · Put your knowledge to work in context.
NCCER Solar PV is a craft training credential in the NCCER catalog of construction trades. NCCER describes itself as "an independent 501(c)(3) nonprofit educational foundation" created in 1996, and its programs and crafts are delivered through accredited organizations and points of delivery rather than by NCCER directly. The NCCER Solar PV case studies are 5 cases and about 3,935 words.
1Energized DC at Dawn: Opening a Connector Under Load
on a clear January morning the ambient temperature is -6°C and plane-of-array irradiance is about 90 W/m². Your crew is at a residential 9.6 kWdc array: 24 modules in two strings of 12, each module rated Voc 41.6 V at 25°C with a Voc temperature coefficient of -0.30%/°C.
778 words, about 4 min2Conduit Ampacity and Fuse Sizing on a Hot Commercial Roof
A 22 kWdc commercial rooftop system has four source circuits, each with Isc 13.9 A, combined into two combiner outputs. Each output is a 2-wire circuit, so four current-carrying conductors share one 1 in.
805 words, about 4 min3Chimney Shadow, Ridge Setback, and a DC Interconnection Cap
A designer lays out 26 modules of 400 W (39 in. × 66 in.) on a south-facing roof plane 40 ft wide by 14 ft slope length with a 5/12 pitch.
752 words, about 4 min4Lag Bolt Between Rafters on a 24-Inch Layout
A 9 kWdc array is being installed on a 12-year-old composite shingle roof over 7/16 in. OSB sheathing and 2×8 rafters at 24 in.
756 words, about 4 min5One String Down 30% and a Ground Fault After Rain
A 15 kWdc array has three strings of 12 modules (400 W, Imp 9.5 A, Voc 42.5 V) on a string inverter with two MPPTs. Strings A and B share MPPT1; string C is alone on MPPT2.
844 words, about 4 min