SteamyTea

May be useful as a first pour in a retrofit, then cover with PIR. As a finished floor, I would be wary. I used to know a guy called Ewan, better known as Dr. Cement form Newcastle. He helped me a lot when I was developing the RTM tooling.

Expanded polystyrene beads in concrete, all held in place with powder silica (they call it aerogel, but it is not really) as a thickening agent. Used similar to make some resin transfer moulding tooling about 35 years ago. You could make your own mix up quite cheaply, but would need a bit of development, which is really what you are paying for. Nothing really wrong with it in principle.

A stone flung out the lawn mower is probably the most likely to break one. As for wiring safety, some conduit on the cables is probably sensible, and probably a legal requirement. Depending on number of panels, the voltage can be up to 1000.

Quick reminder. Power is kW, energy is kWh. I have not had a clothes dryer for years now. My biggest energy saving device was a £1 washing line and pegs from Poundland. If you feel you really must use one, get the most efficient heat pump one, but still air dry what you can. If your house has MVHR, that will really help, if not, put clothes on hangers, hang them in the curtain rail and crack open the windows in that room. As for batteries, they are just about price neutral over standard rate electricity if you use the stored power sensibly.

Tony Blackburn, the DJ, sister had one. She loved it, used to see her tootle into Poole most mornings.

Well worth a read if you think that the rest of the world is not doing enough to reduce emissions from electricity generation. https://ember-energy.org/latest-insights/global-electricity-mid-year-insights-2025/global-analysis/

Set BEVs back 25 years. Some the the guys at work really bought into the concept. Most of us just thought it was a replacement for this.

I did some work on the C5. Had to black out the factory windows.

You can get cylinders modified from the usual standard setup. Maybe 2, 3 kW elements in the top third, that would really heat up the water fast. Then 1, 3 kW in the base to take advantage of excess PV generation i.e after batteries are charged. Can also be mains powered.

Was better than that. Think this was the page. https://forum.buildhub.org.uk/topic/27460-diy-gshp/

The voltage at max power is 33.91. If it is grid connected it will be pulling the maximum power possible. So you will be just above start up voltage. Either more panels or a different inverter.

There is a blog on here where someone made their own heat pump from an old freezer. But the cheapest A2AHP is probably best. I have just bought a 45 quid diesel hot air heater to play with in my shed.

Yes, if the batteries are 48V, then it is only 5 kW (ish). (been a hard week as I did an overnighter for the first time in years)

Is that correct, it would shorten the life of your main fuse.

Wish our showroom had that conversation rate, though our metric is spending per head.

No, they are, as @-rick- says, just instantaneous electric water heaters. They are fitted after the DHW cylinder and with the more sophisticated models, modulate to keep a constant temperature and flow at the outlet. The problem with using immersion heating in the cylinder is that there will be times when you may need to heat a depleted 300 or 400 litre cylinder up by say 20°C, rather than just the water that is needed i.e 60 litres over 20 minutes. This affect the total power requirements needed.

Not read all the above, been way too busy at work (major refurbishment of restaurant). Has anyone mentioned in-line supplementary electric water heaters? They only start when the incoming water gets too cool, and as they are generally around 10 kW in power, cost about £3/hour to run. Get 3 clean kids at an extra quid each.

Welcome @Neo I have been slowly renovating and improving for the last 20 year on my current house. I find it helps to set targets, then work out the most cost effective way to achieve them. You can quite me on kW and kWh if you want, and BIDMAS. Mathematics has grammar to.

Cheaper to use less. Though there does come a point where diminishing returns happen.

You can drill and tap into the steel, but you can also use a PU adhesive. The biggest problems with a steel shipping container is condensation and badly fitting doors.

How about some PV, that will soak up a greater percentage of energy the more sunlight hits the roof. It also produces electricity. You could lay them flat (or a very shallow angle).

Technology & Physics Light-filtering paint cools your home when exposed to hot sun 9 October 2017 By Sandrine Ceurstemont Ordinary red roof tiles against a white sky A cool feature if painted right polarica/Getty The sun itself could soon become a low-cost air conditioner. A high-tech paint that actually cools when exposed to sunlight can provide a better way to chill buildings – and perhaps even solve the long-standing problem of cooling things in space. In hot weather, electricity consumption soars as people turn on the air conditioning, pushing the grid to its limits and raising energy bills. Now Yaron Shenhav and his colleagues from SolCold, a firm based in Herzliya, Israel, have come up with an alternative that doesn’t require electricity. “It’s like putting a layer of ice on your rooftop which is thicker when there is more sun,” he says. The technology is based on the counterintuitive principle of laser cooling, in which hitting specially designed materials with a laser can cool them by up to 150°C. It works because molecules in these materials absorb photons whose light is of one frequency while spontaneously re-emitting higher-frequency photons, which also carry more energy. Since energy is lost, the temperature of the material is reduced in the process. Mounting lasers on your roof wouldn’t be very practical, though, so Shenhav wanted to see if he could tweak the technique to make it work with sunlight instead. “Heat from a building could be absorbed and re-emitted as light,” he says. “As long as the sun is shining on it, it would be continuously cooled.” The problem is that the sun’s spectrum is much broader than that of laser light – a focused beam with a narrow range of frequencies. So the team had to create a material that could do the same trick using several frequencies of scattered light. They came up with a paint made up of two layers: an outer layer that filters out some of the sun’s rays and an inner one that does the heat-to-light conversion, cooling itself below the ambient temperature. So far, the material has been successfully tested in the lab, where the researchers have found that the effect is more pronounced on metal roofs than on concrete, and works best over rooms with low ceilings. Simulations show that a room on the top floor will feel up to 10°C cooler than with the paint applied if applied to a roof of a house than without the coating. The team will conduct pilot tests on buildings within two years. People already use white cooling paints to scatter and reduce the amount of heat buildings absorb. However, they can’t actively reduce the temperature in the building, whereas SolCold’s paint can, says Eran Zahavy at the Israel Institute of Biological Research, who was not involved in the research. Cut the air conditioning The new paint isn’t cheap, costing about $300 to coat 100 square metres. Shenhav and his team think the early adopters will be large commercial buildings like shopping malls and stadiums. There, the coating could lower energy consumption by up to 60 per cent, massively reducing bills and carbon emissions. It could have other knock-on environmental benefits as well. The continuous use of air conditioning in already hot areas like Phoenix, Arizona, creates urban heat islands which have been linked to steadily rising temperatures in such cities. With the new paint, “buildings would be able to install much smaller air-conditioning units,” says Shenav. The paint’s use isn’t limited to this planet: it could solve the significant challenge of how to cool objects in space. That might seem counterintuitive given the frigid temperatures there, but the problem is that there is no air to carry heat away from an object. Currently, the ISS uses reflective fabric to ward off radiation from the sun, and internal heat exchangers to get rid of excess heat produced by equipment. “With our technology, heat is transferred through light,” says Shenhav. “Space applications are a big market for us.” The team will be presenting their work later this month at the Hello Tomorrow technology summit in Paris.

Welcome By the looks of your other post, seems you are renovating.

That is something that did not occur to me, mislabelling. So maybe Plan B. So battery and separate charger/BMS.

No, over ten times the price. I wonder how many they have actually sold.