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Solar Panels and Heat Pump fitted but savings not as suggested.
Comments
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chris_n said:Using electric showers when you have a heat pump or gas and storage is madness. It is just like burning £10 notes. The claims that the solar would cover most of your daytime usage is true for most people using electricity in the way that it is expected to be used. I own a property in the UK and it only imports during the day on occasional days when the weather is reallybad (today).
Even if your panels were at full tilt you would still be importing 7kW. Maybe misunderstood rather than. misled or misheard would be the order of the day.0 -
jaynexxx_2 said:It's not an electric shower, it runs off the hot water. We are as energy efficient as possible, and very careful with what we useAre you certain of that?In your first post you said:The 'peaks' during the day do tend to be around shower times at around 1kwh per 5 minute shower (2 per day)Using 1kWh in 5 minutes suggests a load of 12kW. That's the sort of drain that is only generally seen if running an electric shower, or maybe if charging an electric car.What is the make and model of your shower?If the 12kW load isn't due to the shower, what else do you run at those times?N. Hampshire, he/him. Octopus Intelligent Go elec & Tracker gas / Shell (now TT) BB / Lebara mobi. Ripple Kirk Hill member.
2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 3.6kw inverter. 33MWh generated, long-term average 2.6 Os.Not exactly back from my break, but dipping in and out of the forum.Ofgem cap table, Ofgem cap explainer. Economy 7 cap explainer. Gas vs E7 vs peak elec heating costs, Best kettle!2 -
QrizB said:jaynexxx_2 said:It's not an electric shower, it runs off the hot water. We are as energy efficient as possible, and very careful with what we useAre you certain of that?In your first post you said:The 'peaks' during the day do tend to be around shower times at around 1kwh per 5 minute shower (2 per day)Using 1kWh in 5 minutes suggests a load of 12kW. That's the sort of drain that is only generally seen if running an electric shower, or maybe if charging an electric car.What is the make and model of your shower?If the 12kW load isn't due to the shower, what else do you run at those times?
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if it is using this amount of electricity to heat the hot water, how much will it be using in winter to power the heatingI think we need to start at the beginning.Before you had solar panels and a heat pump, how did you heat your home? How much energy (of each type, if it wasn't all electricity) did you typically use in a year?Just to give you an idea, a typical dual-fuel home might use 3000kWh of electricity and 12000kWh of gas/LPG/oil per year.
N. Hampshire, he/him. Octopus Intelligent Go elec & Tracker gas / Shell (now TT) BB / Lebara mobi. Ripple Kirk Hill member.
2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 3.6kw inverter. 33MWh generated, long-term average 2.6 Os.Not exactly back from my break, but dipping in and out of the forum.Ofgem cap table, Ofgem cap explainer. Economy 7 cap explainer. Gas vs E7 vs peak elec heating costs, Best kettle!1 -
QrizB said:if it is using this amount of electricity to heat the hot water, how much will it be using in winter to power the heatingI think we need to start at the beginning.Before you had solar panels and a heat pump, how did you heat your home? How much energy (of each type, if it wasn't all electricity) did you typically use in a year?Just to give you an idea, a typical dual-fuel home might use 3000kWh of electricity and 12000kWh of gas/LPG/oil per year.0
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jaynexxx_2 said:QrizB said:jaynexxx_2 said:It's not an electric shower, it runs off the hot water. We are as energy efficient as possible, and very careful with what we useAre you certain of that?In your first post you said:The 'peaks' during the day do tend to be around shower times at around 1kwh per 5 minute shower (2 per day)Using 1kWh in 5 minutes suggests a load of 12kW. That's the sort of drain that is only generally seen if running an electric shower, or maybe if charging an electric car.What is the make and model of your shower?If the 12kW load isn't due to the shower, what else do you run at those times?
Or, if it's consuming 1kWh for a shower (in total), then I don't think that's too bad either.Mart. Cardiff. 8.72 kWp PV systems (2.12 SSW 4.6 ESE & 2.0 WNW). 20kWh battery storage. Two A2A units for cleaner heating. Two BEV's for cleaner driving.
For general PV advice please see the PV FAQ thread on the Green & Ethical Board.1 -
You mentioned in an earlier post that you have a 3.6kWh array, so it’s clear that your array isn’t big enough to fully cover your electrical needs if you use 3.562kWh per year, let alone the heat pump.
You need more panels. Or use less electricity.2 -
jaynexxx_2 said:QrizB said:if it is using this amount of electricity to heat the hot water, how much will it be using in winter to power the heatingI think we need to start at the beginning.Before you had solar panels and a heat pump, how did you heat your home? How much energy (of each type, if it wasn't all electricity) did you typically use in a year?Just to give you an idea, a typical dual-fuel home might use 3000kWh of electricity and 12000kWh of gas/LPG/oil per year.In normal times, LPG is about 5p/kWh (35p/l) so £800 would be 16000kWh. (Last winter it was closer to 10p/kWh, 70p/l, so it would be useful to know what price you were paying when it worked out as £800/yr.)Replacing 16000kWh via a heat pump with a 3:1 SCOP will take 5300kWh, which would suggest a total annual electricity demand of about 9000kWh.ecraig said:You mentioned in an earlier post that you have a 3.6kWh arrayI don't know what tariff you are on, but at the default SVT of 30p/kWh you could be looking at an annual electricity bill of £2200.The 1700kWh that you sell back to the grid could (assuming Outgoing Fixed at 15p/kWh) earn you £250 which will be a little help.I have made several big assumptions to get to this numbesr, as mentioned above. If you have more accurate figures it should be possible to refine this estimate further.N. Hampshire, he/him. Octopus Intelligent Go elec & Tracker gas / Shell (now TT) BB / Lebara mobi. Ripple Kirk Hill member.
2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 3.6kw inverter. 33MWh generated, long-term average 2.6 Os.Not exactly back from my break, but dipping in and out of the forum.Ofgem cap table, Ofgem cap explainer. Economy 7 cap explainer. Gas vs E7 vs peak elec heating costs, Best kettle!2 -
QrizB said:jaynexxx_2 said:QrizB said:if it is using this amount of electricity to heat the hot water, how much will it be using in winter to power the heatingI think we need to start at the beginning.Before you had solar panels and a heat pump, how did you heat your home? How much energy (of each type, if it wasn't all electricity) did you typically use in a year?Just to give you an idea, a typical dual-fuel home might use 3000kWh of electricity and 12000kWh of gas/LPG/oil per year.In normal times, LPG is about 5p/kWh (35p/l) so £800 would be 16000kWh. (Last winter it was closer to 10p/kWh, 70p/l, so it would be useful to know what price you were paying when it worked out as £800/yr.)Replacing 16000kWh via a heat pump with a 3:1 SCOP will take 5300kWh, which would suggest a total annual electricity demand of about 9000kWh.ecraig said:You mentioned in an earlier post that you have a 3.6kWh arrayI don't know what tariff you are on, but at the default SVT of 30p/kWh you could be looking at an annual electricity bill of £2200.The 1700kWh that you sell back to the grid could (assuming Outgoing Fixed at 15p/kWh) earn you £250 which will be a little help.I have made several big assumptions to get to this numbesr, as mentioned above. If you have more accurate figures it should be possible to refine this estimate further.0
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£800-worth of LPG at 68p/l is roughly 8200kWh of heat, which will take roughly 2700kWh of electricity to replace.Your total electricity demand for the year will therefore be about 6300kWh, not 9000.Net of solar self-use, you might need to buy 4500kWh from the grid at a cost of £1350.Hopefully that's a bit more reasonable!As part of your solar PV installation you should have been fitted with a generation meter (that measures all the electricity your solar panels produce). You should also have a smart meter which will be measuring how much electricity you export. If you compare those readings you can work out how much solar electricity you have used in your house.Do you know where to find those numbers? Could you share them here?Also, have you signed up yet with an electricity supplier to pay you for your exported electricity?
N. Hampshire, he/him. Octopus Intelligent Go elec & Tracker gas / Shell (now TT) BB / Lebara mobi. Ripple Kirk Hill member.
2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 3.6kw inverter. 33MWh generated, long-term average 2.6 Os.Not exactly back from my break, but dipping in and out of the forum.Ofgem cap table, Ofgem cap explainer. Economy 7 cap explainer. Gas vs E7 vs peak elec heating costs, Best kettle!0
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