SteamyTea

Or derate the circuits at the consumer unit.

As far as I know, A2A has never attracted a government subsidy. What is this? If, say your bedrooms need half the amount of power than the smallest emitter, emits, then can't you pop it in the loft and duct half the air to each room.

There is a good chance that battery systems will be 20% cheaper in a few years time. There won't be the huge price drops that PV modules saw, but there will be one. Also give some time to see what is happening across each phase over a decent time period. And then here is how tariffs will vary. At the moment, basing costings on Octopus's confusing array of tariffs is a big gamble. If imported energy prices drop down to what they were 3 years ago, plus 25%, gas will be around 5p/kWh, normal rate electricity about 18p, and for E7 users, somewhere around 28p during the day and 14p at night. I doubt that these silly number of 15p/kWh to export PV and 5.5p/kWh (or water the best deals are) to import during a short window at night will be about in 2 or 3 years.

Was it me? Kind of thing I say when I am being flippant.

Long time ago when I did some work with small turbine manufacturer we had to go to site as there was a troublesone turbine. Transpired that the SMA WindyBoy had been configured as a SunnyBoy. There was a few seconds delay before the inverter reacted and then shut down. Only happened when the power was ramping up. Apparently the inverter reaction time had to be a lot faster for small turbines than for a similar output PV system.

I think that has come about because we have managed to build a lot quicker, and more importantly, cheaper than we imagined a decade ago. Probably more to do with the local network, not as is you can plug directly into the a local turbine.

I have never researched this in proper detail, but I am under the impression that the inverter/diverter can take a few seconds to realise that it needs to import. When a relatively high load is only going to be on for a few seconds because of excess (above the recent norm) i.e. water heating, some of that advantage may be lost. So if if it takes say 5 seconds for the inverter to react to higher input, and another 5 seconds for the diverter to react to that input, but the spite in energy is only 20 seconds (scattered cloud), that is half the energy lost as ambient thermal energy (which may be useful or not). I think @Radian knows haw fast his home made diverter works. Would be interesting to know.

Yes, nothing really new, but good to see it all in one place. As usual the real problem is in the planning system.

@deancatherine09 Not only the walls that need a better performance, the perimeter to area ratio and the wall to door/window ratio is important. Surface area to Volume ratio is probably the most important design consideration. This can become a challenge is a Passivhaus because of architects/customers wanting 'loads of natural light" which can easily cripple performance. Cutting back on the internal fittings is a good thing, kitchens and bathrooms have become style items, HA is probably the biggest waste of money at the moment, most of that will change in the next few years.

Right Do the same with some of my data. Use a text editor to change the crude .CSV file before importing to Excel, do the calcs and charts, the an image editing package to make charts suitable for posting. Could use another package to hide a watermark, but don't bother, though I should.

They are not, under any scenario at the moment, unless you get them for free.

Getting forgetful. But I did go out after I replied.

So basically just the order things are done in. What I understood it to mean, but got a bit confused when chatting to a customer, who employed an old university classmate and was enthusing about how my old classmate "was doing a great job with workflows in Photoshop". Guess my customer had to justify the cost of buying PS.

I bet the difference is so tiny that it is immeasurable.

What are you using for that? I have a PlantPower one kicking about somewhere.

Don't make it too comfortable.

Yes. Same is true in catering. We once had a batch of bad processed vegetables. Was down to cold weather but the quality was very poor. We asked both our suppliers if they could do better. One said "sorry, that is the best I can do" The other sent us an excellent sample to try. We did not buy from them and the company no longer exists. The other supplier is still about and actually write of a few hundred quid be because his quality had dropped. Cold weather storage problems again.

Can still buy a house in Cornwall for that money.

That much, I got a wireless one for 7 quid at Home bargains. Sounds like Muttley (Wacky Races) laughing.

If it is connected to the grid, in an way, then yes.

I shall have a ponder as well, but today is Comic Day, so shall be a bit occupied. I last looked at these problems about 15 years ago, seem to remember that they were not that complicated, but time erodes the memory of the techniques.

Not seen expressed like that, and I am tired after work. W [watt] can be expressed as J.s-1 [joule per second]. J [joule] can be expressed as kg.m2.s-2 [kilogram times, metre squared, times second raised to the power minus 2] I think you probably need to know the specific heat capacity of the floor material i.e. concrete ~0.8 J.kg-1.K-1, then convert it to a volumetric heat capacity with the material density i.e. concrete 2700 kg.m-3. Then cancel out what you can. I tried to rearrange it all, but too tired. All seems a bit complicated this late at night, but luckily we have a mathematician professor on here, so maybe @Garald will be along to finish off the sums. It is starting to look very similar to the thermal effusively, or thermal inertia units. W.s0.5.m-2.K-1 https://en.wikipedia.org/wiki/Thermal_effusivity

That is what we would do, but others, in the future...

After several year, can you safely stand a small scaffold tower, or ladder on EPDM?

Is can, but these new PU resins are marvels of chemistry and can be applied in the wet. I want to play with them, but missed the guy when he did the roof.