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7.3 kW Bi Facial Rooftop Panels: ~7 year ROI: Fact OR fiction?

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  • Screwdriva
    Screwdriva Posts: 1,528 Forumite
    Fifth Anniversary 1,000 Posts Name Dropper Photogenic
    Petriix said:
    For comparison we generated 22.3kWh in Norwich today from our budget 3.42kWp system. Not a cloud in the sky.
    A quick check shows Norwich at 110+ miles from Rotherhithe. I'm hoping for a system within 5 miles for a fair comparison. 
    -  10 x 400w LG + 6 x 550W SHARP BiFacial Panels + SE 3680 HD Wave Inverter + SE Optimizers. SE London.
    -  Triple aspect. (22% ENE/ 33% SSE/ 45% WSW)
    -  Viessmann 200-W on Advanced Weather Comp. (the most efficient gas boiler sold)

    Feel free to DM me if I can help with any energy saving!
  • Screwdriva
    Screwdriva Posts: 1,528 Forumite
    Fifth Anniversary 1,000 Posts Name Dropper Photogenic
    Hit a new system peak generation high of 3.44 kWh today, despite some early cloud cover. Weird graph here.
    -  10 x 400w LG + 6 x 550W SHARP BiFacial Panels + SE 3680 HD Wave Inverter + SE Optimizers. SE London.
    -  Triple aspect. (22% ENE/ 33% SSE/ 45% WSW)
    -  Viessmann 200-W on Advanced Weather Comp. (the most efficient gas boiler sold)

    Feel free to DM me if I can help with any energy saving!
  • Petriix
    Petriix Posts: 2,297 Forumite
    Ninth Anniversary 1,000 Posts Photogenic Name Dropper
    You'll find that you hit the highest peak when the sun comes out at midday after a shower or period of cloud cover because the panels are cold. On days of full sunshine the heat builds up, reducing the peak generation.
  • Screwdriva
    Screwdriva Posts: 1,528 Forumite
    Fifth Anniversary 1,000 Posts Name Dropper Photogenic
    A new system high reached today. 21.16kWh despite a cloudy morning, highlighted by the attached graph.
    -  10 x 400w LG + 6 x 550W SHARP BiFacial Panels + SE 3680 HD Wave Inverter + SE Optimizers. SE London.
    -  Triple aspect. (22% ENE/ 33% SSE/ 45% WSW)
    -  Viessmann 200-W on Advanced Weather Comp. (the most efficient gas boiler sold)

    Feel free to DM me if I can help with any energy saving!
  • Screwdriva
    Screwdriva Posts: 1,528 Forumite
    Fifth Anniversary 1,000 Posts Name Dropper Photogenic
    21.54 kWh today, besting the previous high. Creeping up towards that first maiden. Much better looking graph here.
    -  10 x 400w LG + 6 x 550W SHARP BiFacial Panels + SE 3680 HD Wave Inverter + SE Optimizers. SE London.
    -  Triple aspect. (22% ENE/ 33% SSE/ 45% WSW)
    -  Viessmann 200-W on Advanced Weather Comp. (the most efficient gas boiler sold)

    Feel free to DM me if I can help with any energy saving!
  • Screwdriva
    Screwdriva Posts: 1,528 Forumite
    Fifth Anniversary 1,000 Posts Name Dropper Photogenic
    22.88 kWh, a new high and a great looking graph here. Here's hoping for a "maiden" this week! 
    -  10 x 400w LG + 6 x 550W SHARP BiFacial Panels + SE 3680 HD Wave Inverter + SE Optimizers. SE London.
    -  Triple aspect. (22% ENE/ 33% SSE/ 45% WSW)
    -  Viessmann 200-W on Advanced Weather Comp. (the most efficient gas boiler sold)

    Feel free to DM me if I can help with any energy saving!
  • Screwdriva
    Screwdriva Posts: 1,528 Forumite
    Fifth Anniversary 1,000 Posts Name Dropper Photogenic
    23.77 kWh today. So close!!
    Graph here
    -  10 x 400w LG + 6 x 550W SHARP BiFacial Panels + SE 3680 HD Wave Inverter + SE Optimizers. SE London.
    -  Triple aspect. (22% ENE/ 33% SSE/ 45% WSW)
    -  Viessmann 200-W on Advanced Weather Comp. (the most efficient gas boiler sold)

    Feel free to DM me if I can help with any energy saving!
  • Screwdriva
    Screwdriva Posts: 1,528 Forumite
    Fifth Anniversary 1,000 Posts Name Dropper Photogenic
    24.1 kWh today!! Finally, a maiden, despite a very slow start as highlighted by today's graph. Expecting to best this tomorrow.
    -  10 x 400w LG + 6 x 550W SHARP BiFacial Panels + SE 3680 HD Wave Inverter + SE Optimizers. SE London.
    -  Triple aspect. (22% ENE/ 33% SSE/ 45% WSW)
    -  Viessmann 200-W on Advanced Weather Comp. (the most efficient gas boiler sold)

    Feel free to DM me if I can help with any energy saving!
  • Screwdriva
    Screwdriva Posts: 1,528 Forumite
    Fifth Anniversary 1,000 Posts Name Dropper Photogenic
    26.05 kWh today despite an imperfect peak of the curve. Didn't expect this kind of performance from a triple aspect system.


    -  10 x 400w LG + 6 x 550W SHARP BiFacial Panels + SE 3680 HD Wave Inverter + SE Optimizers. SE London.
    -  Triple aspect. (22% ENE/ 33% SSE/ 45% WSW)
    -  Viessmann 200-W on Advanced Weather Comp. (the most efficient gas boiler sold)

    Feel free to DM me if I can help with any energy saving!
  • KevinG
    KevinG Posts: 2,088 Forumite
    Part of the Furniture 1,000 Posts Name Dropper
    Screwdriva said:
    26.05 kWh today despite an imperfect peak of the curve. Didn't expect this kind of performance from a triple aspect system.


    Please feel free to post on this thread as not really relevant here:
    https://forums.moneysavingexpert.com/discussion/3853851/renewables-talking-bout-my-generation#latest
    2kWp Solar PV - 10*200W Kioto, SMA Sunny Boy 2000HF, SSE facing, some shading in winter, 37° pitch, installed Jun-2011, inverter replaced Sep-2017 AND Feb-2022.
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