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COP or Cost Per kWh

 
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Air Source Heat Pumps (ASHPs)
Last Post by Ringi 7 months ago
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bontwoody
 bontwoody
(@bontwoody)
Noble Member Contributor
Joined: 3 years ago
Posts: 835
Topic starter 17/09/2024 3:33 pm  

@majordennisbloodnok Hi, as you say carbon intensity is the best measure if you can use that. What really interests me is why the variation in correlation is so large.

Some days price is a very good indicator of carbon intensity and others not so good. On the 8th Sept there was actually no correlation between the two which is mystifying to me, especially as it had a similar intensity to the 29th Aug which had a good correlation.

I only took one month of data in autumn so its possible winter and summer might yield different results.

House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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 Derek M
(@derek-m)
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Joined: 4 years ago
Posts: 4427
17/09/2024 3:52 pm  

@bontwoody

The price will be dependent upon which generators are operating, and also how many 'middle men' are taking their cut.


   
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bontwoody
 bontwoody
(@bontwoody)
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Joined: 3 years ago
Posts: 835
Topic starter 17/09/2024 3:59 pm  

@derek-m I suppose it was unrealistic of me to expection production and customer prices to track each other. Just look at petrol prices 🙂

House-2 bed partial stone bungalow, 5kW Samsung Gen 6 ASHP (Self install)
6.9 kWp of PV
5kWh DC coupled battery
Blog: https://thegreeningofrosecottage.weebly.com/
Heatpump Stats: http://heatpumpmonitor.org/system/view?id=60


   
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 Ringi
(@ringi)
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Joined: 8 months ago
Posts: 2
09/12/2024 8:50 pm  

Carbon intensity can be high for some grid zones while its zero for others due to limited connections between grid zones.   Marginal price is set nationally, so for example can be high while wind turbines in a zone can't generate due to low local demand.


   
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 Ringi
(@ringi)
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Joined: 8 months ago
Posts: 2
09/12/2024 9:12 pm  

If all we cared about was cost per kwh of heat, we can get £0.07 using oversized traditional storage heaters, but on many days we would open windows due to limit control over discharge rate.  So clearly we care more about comfort than kwh of heat, for example a drafty home needs to be heated to a higher temperature to feel comfortable.

But can add 30kwh of basic Chinese batteries to an exisiting inverter for a little over £3k, the £3k would not pay to upgrade many radiators and pipework when chasing higher COPs.   If the choose is between a replacing a functional DHW tank with a heappump optimized DHW tank or 15kwh of batteries, (assume EV driver) then the batteries are likely to lower per kwh costs more.


   
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