SteamyTea

How cold do you think the UK usually is in winter? Not many of us live in the frozen north. Very really below 5°C, 20% of a year, 73 days) Only 0.75% is -3 or below, 2.7 days. (Central England Temperature data set) So a fan heater can sort that out, but ASHPs still have a greater than unity CoP at that temperature.

Have you considered roof integrated PV, similar price to some roofing materials.

Do we know how long the meters pulse the LED for, could that cause a multiple reading? @ProDave will be proud of you. He would sit in a sauna, on the hottest day of the year, just to save exporting 1p of electricity.

When I was studying for my ResM, I had to visit a lot of farms. They treat the rules as if they do not apply to them.

@Radian TL;DR. Shall have a look later when I get home. Going to have a go at rewriting my code with interrupts. Looks simple enough. What to add a temp sensor to my sensor as well. Sometimes I just want a rainy day and no car, only way I get things done at home.

Not deep enough then. Many boreholes around me are only a few meters deep. Full if those careless farmers' pollutants. Farmers claim to be the stewards of the countryside. They are really criminal polluters who play in people's emotions because 'they feed people'.

A number of things going on in your home at once, hard to keep track sometimes. I am a great believer in doing 1 thing, but doing it really well. So separating heating, cooling and ventilation may be better. A traditional MVHR system is not designed and installed as a heating or cooling system. MVHR is really just to replace the air in an airtight building, in a controlled manner. The HR side of it is really just a bonus and a simple modification that scavenges some energy from the expelled air. With any heat recovery system, efficiency changes with the temperature difference. It is possible to make a material difference to internal temperature and humidity levels with an air based heating and cooling system by oversizing the pipework and increasing the flow rates. This takes up more space and costs more to run. So probably only worthwhile in exceptional circumstances. Having said that, it may be possible to have just one or two rooms that have a greater flow rate, and fit FCU (fan coil units) in just those ducts. FCUs can be run from an ASHP in both heating and cooling mode. You can also get MVHR units with build in heat pumps that can make a small difference. As usual, there are many ways to sort out the same problem. But basically all you need to do is control internal air for temperature and humidity, without causing condensation problems.

Have you read the terms and conditions, your other 2 posts are coming across as adverts.

"With the exception of bare, polished metals, the appearance of a surface to the eye is not a good guide to emissivities near room temperature. Thus white paint absorbs very little visible light. However, at an infrared wavelength of 10x10−6 metre, paint absorbs light very well, and has a high emissivity. Similarly, pure water absorbs very little visible light, but water is nonetheless a strong infrared absorber and has a correspondingly high emissivity." Really not worth the bother in my opinion. An extra €1/m² on curtain material will make a much bigger difference.

Have you had a proper heat loss calculation done. That is the very first part. Just knowing the size of a property is of little use.

Larger pump and an accumulator. 2 parts that way.

Borehole.

Don't get caught, you will not be allowed to teach ever again.

Did he use your appraisal?

Part G of the building regs. Just do what they recommend, you can change things later.

Is that a 4 hectare solar farm? Obligatory kW, not kw.

Good stuff. Do you have pictures and prices?

Very good point. I don't have a lawn, and would never water one if I did. I have the most expensive tap water in the country, so don't wash my car either.

Yes. https://en.wikipedia.org/wiki/Emissivity

My old cat never liked the vets after the first trip.

Depends on the angles. If, down here, a 1 kW array can produce 38 kWh a day in December, that implies a 6 kW, south facing, vertical array will do. My current usage is 3 kWh a day at the moment. That will go up to about 20 in December and January.

Building on what @JohnMo has said, to run a heat pump, and just about everything else, you need a minimum power. Just knowing the energy (the kWh) needed a day is of little use. The usual way around this for off gridders is to store as much as you can/need thermally, then what you need for the rest as electrical storage in batteries. This runs the risk of double counting usage i.e. need 6 kWh for DHW which can be supplied purely from a resistance heater, so 6 kWh, or purely from a heat pump, so 2 to 3 kWh, what you don't do is say your DHW takes between 6 and 9 kWh. It takes 6 kWh. Resistance heaters can be designed to have different resistance, so can be used to take small amounts of power when it is deliverable, rather than only when there is enough power generated i.e. 3 kW. I am not sure what the minimum power input is for any individual make of inverter, but there will be a minimum input. Worth looking into that as it will set the minimum array size.

Module orientation and altitude is important, especially for winter generation. Module power is proportional to the product of both the altitude and the azimuth. Energy is the product of the mean power and the hours of daylight. So two extreme examples, with a south facing, 1 kWp array. First is laying flat to the ground, second is 90° to the ground. Very big difference in winter generation.

@MikeSharp01 Any chance you can repost that in my blog (maybe a bit of editing for context), more appropriate there.

First thing is to go to PVGIS and work out what yield you can expect.