Solar Panels and Heat Pump fitted but savings not as suggested.

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  • The best way to optimise your heat pump for water heating is to heat your water when your solar panels are generating the most power.  Then, if you can, turn off your water heating until the same time the following day.  Heating the cylinder once a day will only work if you don't use too much hot water and your cylinder is well-enough insulated.  You might need to heat the cylinder to a slightly higher temperature than you have been using to achieve this. Or it might not be possible, it depends on your circumstances.

    The best way to optimise your heat pump for space heating is to make sure you use the Weather Compensation feature.  This may go under a different name and setting the right parameter can take some time by trial and error but you'll have to wait until it starts to get cold out for that.    
    Thanks, not sure how to do that, but will definitely look into it 
  • Reed_Richards
    Reed_Richards Posts: 3,997
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    You should be able to set when your heat pump is ON for hot water heating and when it is OFF.  If you set it to be ON for an hour when your solar power peaks (which should be 1 pm if the panels face due south) and OFF the rest of the time, you can see if you have enough hot water. 
    Reed
  • zeupater
    zeupater Posts: 5,350
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    My heat pump is set to heat the water in the cylinder to 50 C and to reheat when the temperature drops to 45 C or less.  Both the maximum temperature and the temperature drop before a reheat is triggered (5 C in my case) are programmable.  I don't have a Samsung heat pump but I Imagine it's the same.

    My heat pump has its own electricity meter so I know exactly how much energy it uses (but not how much of that comes from my solar panels and how much from the grid.  Averaged over the first tow years it was in use (14/12/20 to 13/12/22 it used an average of 5980 kWh per year.

    How were you heating your house before you got your heat pump?    


    I don't think mine has a separate meter, i have had a look through the display tho, and it does tell me how much energy it has used each day/week or month, which is helpful. It was set at 50 C but i have dropped it down to 45 C.  Not sure what the reheat temperature is tho, i will keep checking it.  I presume its ok to have it set at 45 C? 

    We were previously on LPG for hot water/heating.  
    Hi
    Are these the settings on the heat pump itself & do you have the ability for separate temperature settings, timings & delays on the cylinder itself? ... also, does the cylinder have boost immersion(s) - if so how many & what's the total power rating (likely multiple of 3kW) ... ?
    Z

    "We are what we repeatedly do, excellence then is not an act, but a habit. " ...... Aristotle
    B)
  • zeupater said:
    My heat pump is set to heat the water in the cylinder to 50 C and to reheat when the temperature drops to 45 C or less.  Both the maximum temperature and the temperature drop before a reheat is triggered (5 C in my case) are programmable.  I don't have a Samsung heat pump but I Imagine it's the same.

    My heat pump has its own electricity meter so I know exactly how much energy it uses (but not how much of that comes from my solar panels and how much from the grid.  Averaged over the first tow years it was in use (14/12/20 to 13/12/22 it used an average of 5980 kWh per year.

    How were you heating your house before you got your heat pump?    


    I don't think mine has a separate meter, i have had a look through the display tho, and it does tell me how much energy it has used each day/week or month, which is helpful. It was set at 50 C but i have dropped it down to 45 C.  Not sure what the reheat temperature is tho, i will keep checking it.  I presume its ok to have it set at 45 C? 

    We were previously on LPG for hot water/heating.  
    Hi
    Are these the settings on the heat pump itself & do you have the ability for separate temperature settings, timings & delays on the cylinder itself? ... also, does the cylinder have boost immersion(s) - if so how many & what's the total power rating (likely multiple of 3kW) ... ?
    Z

    The settings are on the water tank. It allows me to set the temperature but not sure about timings etc 
  • Niv
    Niv Posts: 2,457
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    I think it may also be worth installing a immersion heater controller, I have a solic 200, no need to set timers or anything, it will heat the water if there is 'spare' solar available - it only turns the immersion heater on if there is excess solar being generated and turns off when household demand rises (e.g. you put the kettle on) or if solar is not being generated.
    YNWA

    Target: Mortgage free by 58.
  • markin
    markin Posts: 3,723
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    What controller is it?

    "Samsung although very customisable makes it very difficult.  As pointed out weather compensation is known as water law, which is the Korean translation"


  • zeupater
    zeupater Posts: 5,350
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    zeupater said:
    My heat pump is set to heat the water in the cylinder to 50 C and to reheat when the temperature drops to 45 C or less.  Both the maximum temperature and the temperature drop before a reheat is triggered (5 C in my case) are programmable.  I don't have a Samsung heat pump but I Imagine it's the same.

    My heat pump has its own electricity meter so I know exactly how much energy it uses (but not how much of that comes from my solar panels and how much from the grid.  Averaged over the first tow years it was in use (14/12/20 to 13/12/22 it used an average of 5980 kWh per year.

    How were you heating your house before you got your heat pump?    


    I don't think mine has a separate meter, i have had a look through the display tho, and it does tell me how much energy it has used each day/week or month, which is helpful. It was set at 50 C but i have dropped it down to 45 C.  Not sure what the reheat temperature is tho, i will keep checking it.  I presume its ok to have it set at 45 C? 

    We were previously on LPG for hot water/heating.  
    Hi
    Are these the settings on the heat pump itself & do you have the ability for separate temperature settings, timings & delays on the cylinder itself? ... also, does the cylinder have boost immersion(s) - if so how many & what's the total power rating (likely multiple of 3kW) ... ?
    Z

    The settings are on the water tank. It allows me to set the temperature but not sure about timings etc 
    Hi
    Okay ... I think you'll also need to look for the DHW settings (temperature/timings etc) on the heat pump itself to see what's been set there as that is logically set as the primary heat source .... if there is an immersion in the cylinder it should be set to only top up heat to a level higher than the HP is set to supply (eg sterilisation cycle) or when an immediate manual boost is required. The way the two units communicate and how they're configured can often lead to poor energy use efficiencies.
    HTH - Z
    "We are what we repeatedly do, excellence then is not an act, but a habit. " ...... Aristotle
    B)
  • Reed_Richards
    Reed_Richards Posts: 3,997
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    Apparently Weather Compensation is called "Water Law" on Samsung heat pumps.  That's their own terminology, possibly a mistranslation from Korean?
    Reed
  • Qyburn
    Qyburn Posts: 2,082
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    Apparently Weather Compensation is called "Water Law" on Samsung heat pumps.  That's their own terminology, possibly a mistranslation from Korean?
    How does that work on a domestic installation? If it just varies the overall flow temperature, doesn't that play hell with DHW? 
  • Reed_Richards
    Reed_Richards Posts: 3,997
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    Qyburn said:
    Apparently Weather Compensation is called "Water Law" on Samsung heat pumps.  That's their own terminology, possibly a mistranslation from Korean?
    How does that work on a domestic installation? If it just varies the overall flow temperature, doesn't that play hell with DHW? 
    Of course it does, so it is not applied when heating the DHW.  This is exactly the same as with a gas boiler that uses Weather Compensation except that the improvements in efficiency that it gives you with a heat pump are greater than with a gas boiler.  I take it you have neither, @Qyburn.
    Reed
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