SteamyTea

Right, thought the VA had a built in sensor. I am internally debating about getting one of those cheap sensors. Just to add to all the other ones I have. Need two really, one inside and one outside.

Be fun to see the readings when there is a bonfire nearby. So how come the VentAxia is showing 1000 ppmv and the other sensor was showing 3000 ppmv? Was it before mechanical ventilation?

Not in NI at the moment. https://www.belfasttelegraph.co.uk/news/northern-ireland/mot-tests-for-cars-and-light-vehicles-in-northern-ireland-suspended-38901362.html

1858 m2

If it is a proper 88 kBTU, then that is 26 kWh. Or just over a constant 1 kW (1.08 kW). 26 kWh / 24 h Get your heating people to give the answers in SI rather than Imperial. (You may find there is a few of us that seem a bit nitpicky about the whole kW and kWh thing, the idea is to save confusion in the long run. We also like to work in SI units as these are established and agreed upon)

Used to make log saunas, they sold for about £1500/m2, 30 years ago.

Yes, it was posted before I had finished my first mug of tea.

Yes, or even Btus, just really confused. Is a BTU the energy needed to heat a lb of water 1°F? SI us so much better, but then it is more fun bamboozling people.

Seems there are health problems with high manganese intakes. But as I said, I know little of this. Cornwall has dreadful soil except a few small pockets of land. Does have rain and light though. And warm temperatures.

Seems black soul has a lot of manganese in it. I have no idea if that is good or bad. https://en.wikipedia.org/wiki/Soil_color

Can't it be broken down into a number of relatively small meshes, then connect to an AP for only data that has to come from 'outside'. Seems silly that my phone, 3 RPis, 2 laptops, wireless printer, NAS and 1 Kindle are all connected to one router (actually my phone is the router and I have a second one for all the other stuff. Most of the data is just local stuff i.e stuff from and to the NAS or my main laptop. Or have we just got used to the convenience of a few large servers doing the hard work and giving us what we hope is what we asked for.

I don't understand soil (even though my ResM was in agriculture), but is colour a good indicator of quality?

Why are we still using the same network architecture with access points. By now I would have thought that each device could talk to any other device, reliably and speedily.

Yes, they are always worth having. For a few pounds you can make a cheap data logger as well.

Why can't you measure the surface temperature?

88 kBTU is 26 kWh. (it is kWh not kwh or KWH, or KwH, can see what BTUs are used sometimes) 360 m2 is quite large (about 7 times larger than my place and that uses around 10 kWh/day this time of year) If you can really get a reliable 3 kW of power from the pico hydro, then only a third of that is needed for space heating, so bump the thought of combustion technology.

Assuming you could live with a 2°C temperature swing (1°C above and 1 below ideal) and the off period is during the day, when houses get naturally warmer (with the odd exception), you could probably get away with it. I only use a 4 hour heating period between 3 AM and up to 7 AM, and get away with it most of the time. Have you tried to mimic your timings with your gas boiler. Just get it to switch on for a known period of time to match the 3 kW output. Or fan heaters. February is a good month to test things as it is often the coldest month.

Do you know, and terminology gets hard here, how long a kWh of thermal input lasts. The decrement delay. What I mean by this is, if you put 1 kWh of heat into your building in say 5 minutes and raise the temperature by 1°C (or whatever), how long does it take to fall back by that 1°C (or whatever it was). Alternatively, just plumb the Willis in and see what it does. Monitoring will be very easy.

Do you have collect data as a text file? You could look at anomalies, rather than absolute values, that way any offset almost becomes irrelevant.

When I looked at @DamonHD's data it matched well. It was s school though. I am pretty sure that there is a seasonal variation in CO2. This is because the major landmass is in the northern hemisphere, so goes down during the growing season. https://www.climate.gov/news-features/understanding-climate/climate-change-atmospheric-carbon-dioxide But only seems to be about 5ppm, so probably less that the cheap sensors accuracy.

You can get off the shelf stuff, and it is not as if money is the problem.

I bought a new soldering iron yesterday. May have to give it a go on a spare ESP later.

Lot depends what land area is used up. If, for simplicities sake, you can get 50 kWh/m².year with BECCS, but 75 kWh/m².year with PV and batteries. Then I would choose PV and batteries.

Does not answer my question, just says we need storage.

What do you mean by that? TWh of storage, large units connect to the main bulk carriers, local, pre or post storage at substations.