SteamyTea

Isn't that how it is done these days. A modern version of setting the alarm an hour early.

I am not sure about number 4. This is extra compulsory stuff for the sake of it. House fires happen so infrequently these days, and fatalities even less. And try getting one that works of mains pressure, the local waterboard will not guarantee that there will be enough flow when it is needed. There should be one set of rules, with one interpretation only, for the whole country. That would make life simple for everyone. 'Local Plans' are a nonsense. The only locals that contribute are the ones that have an interest.

Yes it is, goes to show that airtightness and good insulation is all that is needed. I think an MVHR extract up there is a good idea as that can scavenge a bit of warms when the sun is just right, but also control humidity, which is the important thing. Joe90 also has a good loft ladder, that helps.

As @PeterW pointed out, a buffer tank is not a thermal store, or even a UVC/VC. It is just there to smooth out the temperature fluctuations while also helping to keep the heat pump working within its optimum range. Think of it as a capacitor in an electrical circuit, rather than a battery. The formula for calculation is the same.

Start by going here: https://re.jrc.ec.europa.eu/pvg_tools/en/#PVP Fill in all the details and then get the daily file. Averages on there own are of little use, you need to know your usage standard deviation. And having large batteries is only useful for a very short period of time, they need excess generation to charge up on the few sunny days to cover the one dull afternoon. Start looking at all the things that you can get rid of that use power.

Do you know how much insulation is under the pipes?

https://engineering.stackexchange.com/questions/8004/how-to-calculate-flow-rate-of-water-through-a-pipe

Or the easy way is to use Google and just search the site as the forum search is pretty poor.

Is that a WC related pun Did not take long to degenerate, well in my mind anyway.

It may reduce condensation.

Yes, nice boys.

Whose? Pocster or Colin's

That's a good start.

20 lt/min = 0.33 kg/s I got that from here: This is to get an idea of the power that the ASHP is capable of delivering.

You could integrate some PV into your roof, that works out cheaper than slating.

4.2 [SHC of water kJ.kg-1] x 0.33 [flow rate kg.s-1] x 4 [delta T] = 5.6 kW delivered to the house. This seems very low, what size is the ASHP.

If you were in Cornwall, you would notice piles of roof slates kicking about the place. I often wonder if they sell them. Just down the road from me is a farm building that has been slowly crumbling for decades, such a shame that the roof was not reclaimed.

Tis may be a clue. Are you loosing temperature to the floor where the pipes run? Get a cheap IR thermometer and see what the temperatures are in the areas around the pipes.

Welcome Only one person, that we know of, has managed to escape from his dungeon. Lockdown can be interpreted so many different ways.

Only for a few days, the rest of the time it is lower, or higher. Probably lucky to make 6 kWh/day in December.

Does seem odd. Taking a trivial example: 4.2 [kJ.kg-1.K-1] x 2 [kg.s-1] x 5 [K] = 4.2 kJ.s-1 = 4.2 kW. Would make the flow of the system critical in delivering power.

Should be easy enough to swap the wires over

It would show inverter consumption, if there is any. Why don't people just buy SMA inverters and have a trouble free life.

Are you thinking it is wired in back to front?

They do a Bluetooth adapter. But it is really down to what Growatt want you to see. You could make your own, friends how much playing you like to do with basic hardware and software. Or get a CurrentCost and a Raspberry Pi Zero and ask for some code.