Pontypridd sits at the confluence of the Rhondda and Taff valleys in Rhondda Cynon Taf. CF37 covers a varied housing stock: Victorian terrace streets in the town centre, 1970s and 1980s commuter estate at Rhydyfelin and Hawthorn, and newer detached properties at Church Village on the plateau.
Valley floor terraces: the shading arithmetic
Pontypridd town centre carries Victorian miners’ cottages with tight inter-row spacing. At 945 kWh/kWp for the CF37 valley floor, a standard 4 kWp string inverter on a shaded Graig Hill terrace might deliver only 3,400 to 3,500 kWh annually after shading losses — approximately 10% below theoretical. SolarEdge panel-level optimisation recovers the majority of that loss.
FLD’s standard CF37 valley-floor specification uses SolarEdge HD-Wave. The optimised system typically delivers 3,700 to 3,780 kWh where string would produce 3,400 to 3,500 kWh. The annual financial difference is approximately £84 to £107 at 28p/kWh — compounding over 25 years.
Rhydyfelin commuter semi-detached payback
Rhydyfelin and Hawthorn, south of Pontypridd on the A4054, are 1970s and 1980s commuter-suburb estates with south and south-west facing rear pitches. A 4.5 kWp south-facing Rhydyfelin semi at 948 kWh/kWp generates approximately 4,266 kWh annually. At 36% daytime self-consumption, year-one benefit: approximately £740. On £7,800 installed cost, simple payback: 10.5 years.
Church Village plateau
Church Village and the plateau above the Rhondda Valley sit at materially better solar exposure than the valley floor. Elevation removes inter-row shading; the south-facing pitches on 1990s and 2000s detached stock carry more panel area. A 5.5 kWp Church Village detached at 950 kWh/kWp generates 5,225 kWh annually. At 46% self-consumption, year-one benefit: approximately £1,030. On £9,400 installed cost, simple payback: 9.1 years.
Getting a Pontypridd survey
FLD is 40 minutes from Pontypridd. We cover CF37 on east-Wales routes also taking in Caerphilly and the lower Rhondda. Call Paul on 01792 680611.
