{"id":327456,"date":"2026-06-18T13:29:53","date_gmt":"2026-06-18T11:29:53","guid":{"rendered":"https:\/\/www.noel.pl\/self-consumption-what-is-it-why-increase-it\/"},"modified":"2026-06-18T13:29:53","modified_gmt":"2026-06-18T11:29:53","slug":"self-consumption-what-is-it-why-increase-it","status":"publish","type":"post","link":"https:\/\/www.noel.pl\/en\/self-consumption-what-is-it-why-increase-it\/","title":{"rendered":"Self-Consumption – What Is It and Why Should You Increase It?"},"content":{"rendered":"

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In renewable energy, self-consumption means using the energy produced directly at the place where it is generated instead of sending it to the grid or storing it for later. In photovoltaic systems, this concept is especially important because it helps maximize the benefits of investing in solar panels.<\/span><\/p>\n

Key aspects of self-consumption in photovoltaic systems<\/h2>\n
    \n
  1. Financial savings:<\/strong> By using electricity directly from solar panels, you reduce the amount of energy purchased from the grid.<\/li>\n
  2. Lower grid load:<\/strong> Higher self-consumption means less energy is sent to the public grid, which reduces strain on infrastructure.<\/li>\n
  3. Energy independence:<\/strong> The more energy you use on site, the less dependent you are on external suppliers and price changes.<\/li>\n
  4. Flexible energy management:<\/strong> Combined with HEMS systems, self-consumption allows more conscious and efficient use of produced energy.<\/li>\n
  5. Support for renewable energy:<\/strong> Increasing self-consumption supports the practical use of clean energy in everyday operation.<\/li>\n
  6. Lower CO2 emissions:<\/strong> Using solar energy directly reduces emissions connected with conventional electricity production.<\/li>\n<\/ol>\n

    Net-billing versus self-consumption<\/h2>\n

    As net-billing becomes standard and electricity settlement moves toward more flexible rates, self-consumption becomes increasingly important. When the grid receives large amounts of solar energy, selling electricity may be less profitable than using it for your own needs.<\/p>\n

    For this reason, it is often more beneficial to direct energy to the building, especially during sunny hours in spring and summer.<\/p>\n

    How much energy is consumed immediately?<\/h2>\n

    There is no universal answer, but in an average single-family house the self-consumption rate is often around 30%. This means that about 30% of the energy produced by solar panels is used directly where it is generated.<\/p>\n

    What affects the level of photovoltaic self-consumption?<\/h2>\n
      \n
    1. Installation size<\/strong> – the power of the system should match the real demand of the building.<\/li>\n
    2. Time of electricity use<\/strong> – homes or businesses that consume more energy during the day usually achieve better self-consumption.<\/li>\n
    3. HEMS energy management<\/strong> – advanced systems automatically adapt consumption to current production.<\/li>\n
    4. Panel orientation<\/strong> – south-facing panels peak around midday, while east-west systems may better match morning and evening use.<\/li>\n
    5. Weather conditions<\/strong> – sunlight and seasonal conditions affect production and therefore self-consumption.<\/li>\n<\/ol>\n

      How to calculate self-consumption?<\/h2>\n

      To calculate self-consumption, compare the energy used directly from your photovoltaic installation with the total energy produced by the installation.<\/p>\n

      Self-consumption (%) = energy used from panels \/ total energy produced x 100<\/strong><\/p>\n

      For example, if the panels produced 400 kWh in a month and 100 kWh was used directly in the building, the self-consumption level is 25%.<\/p>\n

      How to increase self-consumption?<\/h2>\n
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      • Energy storage:<\/strong> Storage can help, although battery systems may involve high initial costs, limited capacity and energy losses.<\/li>\n
      • Electric car:<\/strong> Charging an electric vehicle during peak photovoltaic production can improve the economics of both the car and the installation.<\/li>\n
      • Conscious energy use:<\/strong> Planning washing, cooking or other tasks during production hours increases direct use of solar energy.<\/li>\n
      • 253V voltage regulator:<\/strong> This can help maintain continuous photovoltaic production when grid voltage becomes too high.<\/li>\n
      • Heat buffers and heat storage with heaters:<\/strong> A well-insulated domestic hot water tank or heat buffer can store thermal energy for later use. High efficiency requires HEMS software, good insulation, copper coils and correct sizing for the building and photovoltaic system.<\/li>\n<\/ul>\n

        The example below shows how self-consumption was increased in September 2023 using a NOEL hybrid electric boiler and HEMS system. Values are given in kWh.<\/p>\n