We'd like to remind Forumites to please avoid political debate on the Forum. This is to keep it a safe and useful space for MoneySaving discussions. Threads that are - or become - political in nature may be removed in line with the Forum’s rules. Thank you for your understanding.

How we reduced our heating gas consumption by 25%

Options
124

Comments

  • Screwdriva
    Screwdriva Posts: 1,188 Forumite
    First Post First Anniversary Name Dropper Photogenic
    edited 2 March 2022 at 2:15AM
    Options
    paul991 said:
    yes  but  your problem will be with a 4 kw system a lot of the time you will be importing for a 3 kw immersion
    We appear to import minimal amounts from the 11-1pm peak generation window, if at all.
    -  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!
  • EricMears
    EricMears Posts: 3,252 Forumite
    First Anniversary Name Dropper First Post
    edited 2 March 2022 at 10:28AM
    Options
    paul991 said:
    yes  but  your problem will be with a 4 kw system a lot of the time you will be importing for a 3 kw immersion
    We appear to import minimal amounts from the 11-1pm peak generation window, if at all.
    That might not prove your panels were supplying enough electricity to (almost) supply immersion.  If tank is well lagged and very little hot water used in that period,  immersion would be off most of time.
    NE Derbyshire.4kWp S Facing 17.5deg slope (dormer roof).24kWh of Pylontech batteries with Lux controller BEV : Hyundai Ioniq5
  • Screwdriva
    Screwdriva Posts: 1,188 Forumite
    First Post First Anniversary Name Dropper Photogenic
    Options
    EricMears said:
    That might not prove your panels were supplying enough electricity to (almost) supply immersion.  If tank is well lagged and very little hot water used in that period,  immersion would be off most of time.
    I have attached a graph for a typical clear sunny summer day. Should do the explaining about immersion supply.

    Our hot water consumption pattern ensures the tank will always be depleted prior to 11am.

    -  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!
  • 2nd_time_buyer
    Options
    EricMears said:
    That might not prove your panels were supplying enough electricity to (almost) supply immersion.  If tank is well lagged and very little hot water used in that period,  immersion would be off most of time.
    I have attached a graph for a typical clear sunny summer day. Should do the explaining about immersion supply.

    Our hot water consumption pattern ensures the tank will always be depleted prior to 11am.

    Is there such a thing as a "typical clear sunny summer day" in the UK? 
  • Verdigris
    Verdigris Posts: 1,725 Forumite
    First Post First Anniversary Name Dropper
    Options
    It's called a hen's tooth, hence the shape of the graph.
  • Screwdriva
    Screwdriva Posts: 1,188 Forumite
    First Post First Anniversary Name Dropper Photogenic
    Options
    Is there such a thing as a "typical clear sunny summer day" in the UK? 
    I checked 2021 (which wasn't anywhere as clear as 2020) and I counted 30 such graphs.
    -  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!
  • QrizB
    QrizB Posts: 13,822 Forumite
    First Anniversary First Post Photogenic Name Dropper
    Options
    Is there such a thing as a "typical clear sunny summer day" in the UK? 
    I checked 2021 (which wasn't anywhere as clear as 2020) and I counted 30 such graphs.
    1 day in 12, ish? That's more than I'd have guessed!
    N. Hampshire, he/him. Octopus Go elec & Tracker gas / Shell BB / Lyca mobi. Ripple Kirk Hill member.
    2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 3.6kw inverter. 30MWh generated, long-term average 2.6 Os.
    Taking a break, hope to be back eventually.
    Ofgem cap table, Ofgem cap explainer. Economy 7 cap explainer. Gas vs E7 vs peak elec heating costs.
  • 2nd_time_buyer
    Options
    QrizB said:
    Is there such a thing as a "typical clear sunny summer day" in the UK? 
    I checked 2021 (which wasn't anywhere as clear as 2020) and I counted 30 such graphs.
    1 day in 12, ish? That's more than I'd have guessed!
    I get the same shape on a constantly cloudy day too. Only the output is about 1/10th!
  • EricMears
    EricMears Posts: 3,252 Forumite
    First Anniversary Name Dropper First Post
    Options
    EricMears said:
    That might not prove your panels were supplying enough electricity to (almost) supply immersion.  If tank is well lagged and very little hot water used in that period,  immersion would be off most of time.
    I have attached a graph for a typical clear sunny summer day. Should do the explaining about immersion supply.

    Our hot water consumption pattern ensures the tank will always be depleted prior to 11am.

    From that graph,  if your immersion is the normal 3kW job and nothing else in house was running you would have avoided imports between 11am & 2pm.  When immersion had been running for 3 hours tank might have got to temperature.
    NE Derbyshire.4kWp S Facing 17.5deg slope (dormer roof).24kWh of Pylontech batteries with Lux controller BEV : Hyundai Ioniq5
  • Magnitio
    Magnitio Posts: 974 Forumite
    First Anniversary First Post Name Dropper
    Options
    You can get lower power immersion heaters which provide more flexibility. I've installed a 1.5kw immersion controlled by a TP-Link HS110 smart plug that allows scheduling and also records energy consumption.
    6.4kWp (16 * 400Wp REC Alpha) facing ESE + 5kW Huawei inverter + 10kWh Huawei battery. Buckinghamshire.
Meet your Ambassadors

Categories

  • All Categories
  • 12 Election 2024: The MSE Leaders' Debate
  • 344.1K Banking & Borrowing
  • 250.4K Reduce Debt & Boost Income
  • 450.1K Spending & Discounts
  • 236.3K Work, Benefits & Business
  • 609.6K Mortgages, Homes & Bills
  • 173.5K Life & Family
  • 248.9K Travel & Transport
  • 1.5M Hobbies & Leisure
  • 15.9K Discuss & Feedback
  • 15.1K Coronavirus Support Boards