SteamyTea

I am having a bad day with lightbulbs on my car, so let me relax and do a bit of arithmetic. A cubic meter of air has a density of around 1.25 kg.m-3 and a specific heat capacity of 1 kJ.kg-1.K-1. So a m3 takes 1.25 kJ of energy to be raised by 1K or °C. That is 0.00035 kWh. I would think that the fan moving the air would use that much energy.

I just did the sums. A 200 litre cylinder heated from 30°C to 60°C, with electricity at £0.12/kWh will cost ~£306/year. Evan at full price electricity, or heating it up twice a day, would still work out about the same as a Sunamp.

Do they all have to look like Japanese school girls though. Be my girl - Sally (Police) I was blue and lonely I couldn't sleep a wink And I could only get unconscious If I'd had too much to drink There was somehow, something wrong somewhere And each day seemed grey and dead The seeds of desperation were growing in me head I needed inspiration, a brand new start in life Somewhere to place affection, but I didn't want a wife And then by lucky chance, I saw in a special magazine An ad that was unusual, the like I'd never seen Experience something different with our new imported toy She's loving, warm, inflatable, and a guarantee of joy She came all wrapped in cardboard All pink and shriveled down A breath of air was all she needed To make her lose that frown I took her to the bedroom And pumped her with some life And later, in a moment, that girl became my wife And so I sit her in the corner, and sometimes stroke her hair And when I'm feeling naughty, I blow her up with air She's cuddly and she's bouncy, she's like a rubber ball I bounce her in the kitchen, and I bounce her in the hall And now my life is different since Sally came my way I wake up in the morning and have her on a tray She's everything they said she was and I wear a permanent grin And I only have to worry in case my girl wears thin

You tried to charge me extra as it kept going down on me.

Very true down here, and the he local infrastructure arguement. I constantly tell people that our local hospitals and roads are underused. Never goes down well, but I then point out the hat in the summer, the population swells by a factor of 2, and we all cope fine. The reason schools are closing is that our replacement rate is about 1.4, not enough people are having kids to keep schools open.

Which is set at 1. CO2, a decade ago, was the next big thing. Wonder why it never happened.

The plan is to pass the buck to LAs. Then say 'it is the LAs fault'. Then withhold grants for failure of service.

We made a large water tank and shutes that was part of a factory chicken farm. Basically the chickens got hung by their feet with metal clamps, then they got dragged down the shute into the water, which was electrified. We gave the job to the only vegetarian, life was different in the late 70s.

I got a new Bosch washer about a year ago, it did not have one of those. I feel cheated.

I used to make and install saunas, steam rooms, spa baths and sunbeds. Steered clear of swimming pools. There are many different pool types, from a simple block and liner, right though to flexible concrete ones. I stayed well away from the sales people when we had joint projects. A nicer bunch of wankers you could not hope to meet. They only work on sunny days, a monkey can sell a pool when the sun shines. You need to make sure that you use stainless or galvanised fixings, the chlorine/bromine fumes rot steel a treat.

I usually use the feed that came with the last washer. Must be 20 years old now. Is it some sort of filter?

I use a 200 litre E7 cylinder (vented) with no problems at all. Even when I have had 4 people in the house it has coped (I just up the temperature). There is a lot of stuff about Sunamps on here, read up on them and make your own mind up. I cannot comment on the Mixergi, but they are really just a tank of water, and we know the thermal properties of water very well.

You certainly can with single module micro-inverters, they just pump out AC at the correct voltages. I am not sure about optimisers, they may have hard wired limits built into them.

We have seen a recent drop in usage, but that is not set to continue. It will make economic sense to electrify and generate with mostly renewable energy. The National Electricity grid has been rebuilt, expanded and improved many times over the last 100 years, I suspect that when the local DC grid in High Wycombe, powered by a local coal fired station got changed to a grid connected AC grid in the very late 1940s, there were people saying it is unnecessary and will only cost more. The world moves on, sometimes not fast enough.

5 kWh a day for DHW for all of you really quite low. A larger cylinder may help a bit, but as you can top up with PV a lot of the year, you may get a marginal benefit. I use about the same and I live alone.

Welcome. Quite difficult what to suggest without a lot more detailed analysis. A2AHP is a relatively cosy effective form of heating, and cooling. Do you know your energy usage for DHW? Do you know how much insulation is under the UFH, you may be making the worms and moles warm.

Except we are not building new generations on the same sites as the old generation. And we will be increasing the capacity, and resilience of the network as we move away from fossil fuels. The National Grid is not really like a house or factory circuit, it is much more sophisticated. Vast amounts of power can be very quickly rerouted when conditions change, it is very dynamic.

First thing to learn, and you know a little bit of it already, is Ohm's Law. The second thing to know is the resistivity of cables, well metals really. https://en.m.wikipedia.org/wiki/Electrical_resistivity_and_conductivity Then, as others have said, how to use a multimeter. Bigger is better as the writing on the dial is bigger, or maybe that me just getting old. No need to buy an extra expensive one, I got one from Poundland, works well and the probes are pretty decent. Final thing to know, and this helps with PV as there are some quirks, is it he fundamental difference between AC (alternating current) and DC (direct current). There is a reason that people say play safely with DC. Though Topsy the Elephant was actually dispatched with AC, though there had been a long running arguement about which type of power delivery was the safer. Hopefully, all your AC side is covered by an RCD/RCBO. So your personal risk is low.

Yes, but the units are W.m-2.K-1 which is U-Value, unless the thickness is 1 metre. Mineral wool: 0.030–0.040 W/m²K

Something don't look right there. Are they k-values W.m-1.K-1 100mm of mineral wool would have a U-value of .38 W.m-2.K-1

RTFM usually helps. As you are 3 phase, I would not have thought that the voltage was going to high, but as you said earlier, your local grid was weak. It may be possible that the battery system is fighting against the PV system, which may be by design i.e. start discharging batteries when they are full (or close to it). Is the PV and batteries on separate inverters?

Overall generation is down (the energy delivered). The generation capacity (the power) at the peaks is also down, but the time spent generating at that peak is up by 10%. (I think, but gridwatch shows energy, not power, but I think I have converted it correctly).

All depends who else is, or isn't, pumping some power in. This was a fairly common occurrence in the initial solar boom. Too many people had PV fitted and the local voltage rose too high, leading to a lot of upset customers. This is why the default is 16A per phase, but even then it can give local problems. It is part of the reason that older 'council housing' has not been retrofitted with PV, even when there was funding for it. No one wanted to pay for the grid reinforcement. I was involved with PV installs back in 2010, we did 4 installations, all 4 kW, 16A, and got sent a bill for a new DNO transformers. Apparently there is a clause that allows this. The business owner just dissolved the company. I had left by then as he was a crook and assumed that the rules only applied to others.

Your export voltage is limited to 253V, so if it goes above this, it can shuts the inverter down, or through electronic magic limit the export. I could be that. If it is, the only thing you can do is have a word with the DNO and see if they can adjust the local transformer. They don't usually like doing that.

BRE has this 2010 document with some values. https://files.bregroup.com/bre-co-uk-file-library-copy/filelibrary/SAP/2009/SAP-2009-Appendix-K.pdf And the LABC has this one. https://www.labc.co.uk/sites/default/files/resource_files/zch-thermalbridgingguide-screen.pdf ESE https://www.energy-saving-experts.com/wp-content/uploads/2011/07/Thermal-Bridging-Part-L1A-landscape-version-.pdf Should be enough there to work it all out yourself and save a few quid.