C&G 2922-34 Solar PV case studies
C&G 2922-34 Solar PV · Put your knowledge to work in context.
C&G 2922-34 is the City & Guilds qualification in the Installation and Maintenance of Small Scale Solar Photovoltaic Systems, a Level 3, competence-focused award for people who already work in electrical installation and want to extend their work into grid-connected small-scale solar PV. Candidates typically arrive able to select protective devices, size cables, test circuits and work safely at height, and the qualification builds directly on those skills rather than teaching electrical fundamentals from scratch. The C&G 2922-34 Solar PV case studies are 5 cases and about 4,354 words.
1Adding modules to a string on a cold Aberdeenshire roof
A 4.8 kWp domestic system is being designed using 12 x 400 W modules on a south-facing roof in Aberdeenshire. Module data: Voc 41.6 V, Vmp 34.2 V, Isc 12.4 A, Imp 11.6 A, Voc temperature coefficient -0.29 %/degC, Vmp coefficient -0.35 %/degC.
788 words, about 4 min2Asbestos cement roof, 16 kWp, and a grant deadline
A farm packhouse has a pitched roof clad in corrugated asbestos cement sheets installed in 1978. The sheets look sound and undamaged.
820 words, about 4 min3Slate roof, cellar inverter and an isolator the customer wants hidden
A 6 kWp array of 15 x 400 W modules (Voc 41.2 V, Vmp 34.5 V, Isc 12.4 A, Imp 11.6 A) is to be fitted to a 1900 slate roof on a three-storey Victorian house. Two roof lights sit in the proposed field, and there is a lead-lined valley and a clay chimney stack.
927 words, about 5 min4Back-feeding a 5 kW hybrid into a full 16th edition board
A customer has ordered a 5 kW single-phase hybrid inverter with a declared maximum AC output current of 21.7 A. The supply is TN-C-S with a 100 A cut-out.
945 words, about 5 min5Two-year-old 4 kWp system producing 'half of what it did'
A 4 kWp system commissioned two years ago is reported by the customer as 'making about half what it used to'. The array is two strings of 5 x 400 W modules on a west-facing roof at 35 degrees, paralleled through a Y-branch connector pair onto a single MPPT.
874 words, about 4 min