SteamyTea

Pretty good, most people find it under estimates a bit, maybe 3 to 5%. Some of that will be down to quality of modules (the real term for panels). This is because, to offer a guaranteed output in a decade of say 80% performance, the manufactures actually supply higher powered modules, but marked up as lower powered ones i.e. 320W modules but marked as 305W.

It shows that So for me, 48/1060 * 100 = 4.5% Huge daily variation though.

Penzance

This is for a 1 kWp system in Manchester

I took a stab at it and posted it up somewhere on here. Really just a case of taking the slab thickness i.e. 0.15m, add it to each edge, to a 0.15m thick slab that is 5m by 10m become 5.3m by 10.3m. Then multiply that by the U-Value below the UFH system, and the temperature difference. The temperature difference is the ground temperature in mid winter i.e. 4°C and the mean UFH system temperature i.e. 35°C. So a delta T of 31°C.

Where did you learn to say that from?

If you knocked out the whole of India, then that would be 1.45bn less. Back to 2005 levels, and people where saying them there are too many of us. in 1970, Limits to Growth and Population Bomb were popular reading, there were 3.7bn people, people said too many. 1951, 2.6bn. Was it a problem then? I was not born. Now let us look at energy usage by person since 1950. Year Pop billions Energy TWH Energy per person /kWh/y Power per person /kW 1950 2.6 28600 11000 1.3 1960 3.1 42000 13548 1.5 1970 3.7 66400 17946 2 1980 4.5 88000 19556 2.2 1990 5.3 107000 20189 2.3 2000 6.1 123000 20164 2.3 2010 7 153000 21857 2.5 2020 7.8 168000 21538 2.5 I wonder if we have reached peak energy/power per person? I also wonder if we can reduce usage to 1 kW per person. Data from Population Energy

Ohms Law. Get the voltage to 3.3V on the data wire. https://raspberrypi.stackexchange.com/questions/41234/max-length-of-wire-w-3-3v-or-other-issue

I think that has almost happened. It is amazing how fast the fertility rate has dropped, and in the most unlikely places. Sub Saharan Africa, which has plenty of land, water, and mineral resources, but even worse politics than us, is the next place to transform it selves (plural as many countries). Could be a good place to to help out. No need to interfere with all the countries, just ones that are internally willing to change.

Probably. I have some ESP8266 but not got around to playing with them much. Going to wait till I am housebound for whatever reasons.

Well it should be. But that really entails getting people to change. The SW already has the most expensive water in the country, and has shown it can save a bit easily. Getting flows restricted may be a step too far at the moment. Cornwall is a relatively low density county, about 160 people per km2. With less than 600k people, all infrastructure projects are expensive. Add to that the unique problem that the population more than doubled in the summer, our infrastructure has added costs. Still functions amazingly really. Not many places can cope with the variations in all aspects of life i.e. food supply, energy, water/sewage, policing, medical facility, housing...

https://midsummerenergy.co.uk/ Look at the GSE in roof system.

One of the posters about saving water was to save it for our visitors. Did not go down well in some quarters. Really a case that climate change has shifted weather patterns more northerly, so Cornwall is gradually getting dryer. More reservoir will have to be built. If it it accepted that some land will have to go to reservoirs, there is an opportunity to float solar farms on them. And part could be turned over to holiday homes and recreational/educational facilities. I think we tend, as a nation, to be too small minded about development. No reason something cannot be multifunctional. Hard to legislate for, but new developments could contribute to local carbon sequestration projects. So say 100 hectares need to be developed for housing, 50 local hectares could be turned into woodland or wetlands. There are secondary opportunities for tourism as well. Trouble we have is that it seems to be one thing, and one thing only. Much imagination is needed. One area is the existing housing overheating, no one wants roofs covered in solar reflecting bitumen paint, which is cheap and effective, or put a tinted film on windows. PV on roofs and walls is effective at reducing some energy input into buildings, but is seen as expensive, so not done by many, and not done at all for overheating reasons. Local food production, while it seems sensible, probably isn't. Different areas of the country/world have different climates, topology, geology and transport links. Our transport links are based on old industries and agriculture. Be a shame to neglect what is already there and works. Like power delivery, the inefficiency is in the last few miles, not the bulk transport. Companies don't look for the most expensive and environmentally damaging way to trade in goods, they look at the cheapest. Most of the developed world has similar standards and taxes, but some have better skill sets or other resources. Tulip, that turns pigs into bacon and sausages, is in Redruth, not where the market is. But it does make for cheap bacon. Half a pound of offcuts pressed into a mould. Not many local farms will do that for you.

Yes. we got some money knocked off our bills if we could, collectively, each save 5 lt a day. We managed that. It is not over development or anything sinister down here, just been, for a very wet area, a little bit dryer. I don't think that SWW pumps much underground water, most of it is radioactive, or polluted with tin, copper, arsenic, lithium...

We have had one since last summer.

Similar to a Steely Dan?

Care to share them?

On the RPi it is easy to assign more GPIO pins to 1-Wire protocol.

I found having more than 8 on a wire it became unreliable. You can change the resistor value which helps, but not sure by how much. I have used 10K, but never 2K.

Could you use some plastic guttering, square section, on its side. It is only to stop sliding until the plants are established, and to deflect water runoff to a drain. I would have thought agricultural fleece would act as a filter. Go to the GQT website, they know all about everything garden related.

Keep the ideas coming, it is quite interesting.

Just try it, nothing much to loose really. Not even worth procrastinating about.

There has been a lot in the press recently about this, and down here we have seen record breaking sea surface temperatures, and nationally we have probably had the warmest June ever. Now we (scientists) know that the underlying problem is the increase in atmospheric CO2e gases and land use change. So rather than bang the same drum about reducing energy usage, insulate homes, population control (though that is more about prejudice than anything else), blaming other countries etc, let us assume that we have missed the boat on mitigation, and are now into resilience. How can the UK make itself resilient to climate change and weather variation. So to kick the ball off here is the start of my list about what we have to look at: Agriculture Flooding Drought Storms Travel Energy Production Education Industry/Commerce I am going to go against my usual optimistic outlook and assume that within a decade the above areas will become a real problem. So how can the normal home owner help in this global problem?

The manhole cover collapsed in my drive last week. It was a private sewer pipe that got adopted by South West Water a few years back (never got my insurance money back). I contacted SSW and they looked it up on their map (some old software that just happened to be developed my an ex of mine back in the 90s), found it, came around decided it was dangerous, got it covered over and then repaired, all within 3 days. Brilliant service. Thames Water on the other hand, hopeless. They installed a meter at my parents house about 20 years ago, billed on estimates, but cannot locate the meter to actually read it. So as the house was empty for most of the last year, and little usage for the previous decade, a huge over payment that may not now be recoverable (the smart electric meter is faulty as well, so another challenge). So try your local water board first.

Can you just run a normal, cheap hosepipe around the garden, block the end and then punch holes in it where you want water to come out. I found a small holes in my pipe was brilliant at water my indoor plants when I need to water my front garden (tap at back of house). It also washed the furniture, walls, electrical sockets....