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Member postings for Martin 100

Here is a list of all the postings Martin 100 has made in our forums. Click on a thread name to jump to the thread.

Thread: Trouble at Mill!
23/10/2017 21:43:26

One hopes the CCJ has already resulted in a recovery of the appropriate compensation, if not then from information at companies house I suspect it might have been a waste of time and effort.

The filing history with companies house shows an ongoing lack of on time filings and a company with few assets

A quick examination of companies with the same/previous director/directors as (05305685) shows a possible separation of activity across multiple companies at a similar/same address, some of which have previously being Dissolved (and previously dormant) (06983161),With a Proposal to Strike off (05305658) or in Liquidation (05140767)

Following a CCJ I'd be looking to engage the services of a High Court Enforcement Officer

FAQ here

Thread: John Stevenson
23/10/2017 20:42:03

When you see a thread with a persons name you know its almost certainly not going to be good news. I've still got archived uk.rec.models.engineering posts moved across from multiple computers dating from 2005 from John S, and first met him in person on the arceuro stand at Harrogate Show a few years later when he was demonstrating an X3 cutting gears. His input there, more recently at Doncaster regrinding the cutters last year, plus many times here and elsewhere online over the years will be sadly missed. RIP John and condolences to the rest of his family.

Thread: The diesel controversy
16/05/2017 11:45:46
Posted by Russell Eberhardt on 16/05/2017 09:12:24:
Posted by Martin 100 on 15/05/2017 22:06:23:In Germany everything you fit to the vehicle must be TUV approved in order for the car to remain legal for road use.

Really? If true that is against EU rules on free movement of goods and services. TUV are just one of many test houses. What is required is CE marking for those items that are covered by EU Directives requiring it.

Russell

Compliance by CE marking for 1:1 direct replacements is enough, but for anything not a 1:1 replacement, involving some degree of modification, or deviation from the orignal type approval is not.

As an end user you can fit what you like sourced within Europe or elsewhere, but you cannot use it on the road in Germany, nor will a vehicle pass the equivalent of the VOSA MOT test if you do not have the supporting documentation. CE marking in this instance is worthless without a proper paper trail and without an ABE or a TUV reference the CE marking by itself is not enough.  

(this is in reference to motorbikes but cars are treated the same)

ABE and TÜV certificate of conformity – how to maintain a clear overview

It's very effective proactive enforcement of their equivalent of the construction and use legislation to the actual vehicle fleet on the road. It's also ensuring continued type approval compliance regardless of in which country it was first achieved.

It's not a barrier to free movement of goods and services.

Edited By Martin 100 on 16/05/2017 12:06:00

15/05/2017 22:06:23
Posted by Martin Kyte on 15/05/2017 09:10:50:

I still don't understand why exhaust systems don't rust out these days?

Martin

 

Tetra-Ethyl Lead requires the addition of a lead scavenger, commonly Ethylene Di-bromide to stop excessive buildup of lead oxides in the combustion chamber and to ensure the removal of the lead into the exhaust stream, this combines with combustion water / steam in the exhaust to form an acid.

Remove the tetra-ethyl lead from the fuel and you can remove the scavenger, and thus remove the exhaust corrosion problem. A petrol vehicle with a catalyst will, by the ongoing inherent chemical reactions have considerably more 'water' in the exhaust stream than non-cat equipped vehciles.

The actual fabrication and construction of exhausts has changed a bit over the years but fully aluminised exhausts were actually standard fitment to things like the mini metro in the early 1980's, from the removal of lead to standard cat fitment in the early 1990's the level of corrosion on exhaust has dropped considerably, fatigue failures are in my experience now far more common than corrosion.

Also fitment of cats was nothing to do with stopping people 'gassing' themselves with the CO. They orginated in the country where you can easily buy a handgun at the local supermarket, which is claimed to be far more effective and less painful than choking on exhaust fumes.

PS Aftermarket brake pads have to meet a certain (high) percentage of the braking capability of the orignals in order to be allowed on sale anywhere in the EU  (ECE R90) .  

In Germany everything you fit to the vehicle must be TUV approved in order for the car to remain legal for road use.   In the UK we are slightly more lax but ignorance of the construction and use regulations does not absolve you of prosecution.  Removing a DPF (or a catalyst) makes the vehicle non complaint for road use.  This is an absolute and is not open to any interpretation.

Edited By Martin 100 on 15/05/2017 22:25:26

Thread: Doncaster show
10/05/2017 19:49:58

Having to go through two sets of lights and then make a turn into sandall beat road and then exit, back on to Leger Way, a junction with extremely bad visibility, and a conflict with bus garage traffic opposite is imho nuts.

For a right turn to be prohibited at the disabled car park entrance then there has to be a sign, there is no sign

The sign on the lampost just before the gap prohibits u-turns from either direction.

There is no mention of right turns being prohibited, and as the central reservation lines are clearly marked as broken then the gap can legally be used for a right turn (or for exit from the car park for a right turn) It is no different in law to the right turn into Sandall Beat Road.

For a clearway (not freeway) to exist then signage has to be displayed like this, large at the start of the restriction and all points leading on to it, and small repeats at a minimum of one mile intervals.

Or for an urban clearway like ths

The road at least further east, starting somewhere just beyond the location of Wickes was once a clearway, but that was a very long time ago, when it was a 60 limit with no traffic lights.

But a clearway does not prevent right turns across traffic, indeed there are two south/westbound right turns on Leger Way that have always existed and did so during the period clearway signage existed on that stretch of road.

But you have my sympathies, after all it is the wazzocks at south yorkshire police you will be dealing with.

10/05/2017 16:59:25

Neither of the traffic lights permit u-turns. The gap in the central reservation shown above is the only legal option when approaching from the A638 (old A1 pre 1960 ish) The gap is there for a reason

 

Edited By Martin 100 on 10/05/2017 16:59:45

10/05/2017 11:01:17

Presume you mean accessible parking Eric?

 

Here is the gap in the A18 from the road heading roughly east from the large roundabout, the parking for the disabled is in that area right in front of the brick clad building. 

 

Edited By Martin 100 on 10/05/2017 11:07:18

Thread: Scam warning
10/05/2017 00:45:56

Not sure if its still happening but CNC machines usually Haas VMC's were regularly listed on ebay for say 20k with say 500 quid delivery 'on a pallet' Photos were lifted straight from US dealer sites, with that intense clear daylight you only get in southern europe or oz or the usa clearly flooding the background windows or building.

The listings were always in quite remote locations, a village in West Wales, Scotland well north of Inverness, or somewhere in the isles like Stornoway. Nearly always zero feedback accounts but not 'new' they were always a few months old.

Thread: Unheated garage ok for a lathe?
08/05/2017 23:33:17
Posted by Mike E. on 08/05/2017 22:14:51:
Posted by Martin 100 on 08/05/2017 20:28:29:

.......................... Resist the temptation to heat it with a woodburner, in fact resist the temptation to heat it at all with fossil fuels or electric. ...........................

Why ? I'm just an old person trying to understand.

Because it's relatively easy to provide a very usable, extremely comfortable workspace with a reasonable air temperature and humidity with nothing more than occupation heat and solar gain through double (or triple) glazed windows supplemented with solar air heaters. If it's not warm enough get a cat or dog in

A workshop as comfortable a place to be as a really well built modern house (not that many of those actually exist) A workshop where your total energy bill for heating and cooling is approaching zero becuase you spent a few hundred quid on 'extreme' insulation together with draftproofing and getting overhangs over the windows right to stop overheating in the summer.

Of course there are some that think insulation and controlled ventilation are the work of the devil and will continue to hack down forests and burn 'waste' wood or whatever chucking most of the heat up the stack and polluting the local area and will simply open the door when it gets too hot. It's usually the same ones who slather oil and grease on everything, cover everything with a dust sheet and leave 60W light bulbs running for 6 months of the year under the covers to 'prevent rust' and work in subzero condtions until the woodburner gets up to temperature.

Localised heat with infra red is really only needed when you have 60ft high ceilings and hanger sized doors Same with fan heaters, only needed if you are sat at a bench on a cold uninsulated concrete floor to stop legs freezing up.

08/05/2017 20:28:29

The machine tools will 'survive' with oil, grease, gloop and buggering about with covers and tungsten filament light bulbs and all the other ancient bodges more fitting of the 19th century than the 21st.

A cold damp workshop is not pleasant to work in. Build a new workshop or properly insulate the cold one. Resist the temptation to heat it with a woodburner, in fact resist the temptation to heat it at all with fossil fuels or electric. A bit of heat gain from the sun is all you really need for most of the year.

https://en.wikipedia.org/wiki/Solar_air_heat

http://www.reuk.co.uk/wordpress/solar/make-a-simple-solar-air-heater/

http://www.builditsolar.com/Experimental/PopCanVsScreen/PopCanVsScreen.htm

Thread: The diesel controversy
08/05/2017 10:42:10
Posted by Circlip on 08/05/2017 09:53:13:.

And don't forget, we were the first city in the UK to put traffic lights on a roundabout.

Other than at very quiet times there are many roundabouts that simply would not function without traffic lights.

On some roundabouts without lights you have to rely on breaks in the traffic caused by traffic lights often many hundreds of metres away to give you any reasonable chance of crossing.

Thread: Removing Stud Extractor
06/05/2017 14:18:28

Can't ever recall a left hand drill ever working, all they do is drill a hole.

For mangled or rusty bolt heads or nuts I use the Irwin spiral grip removers

 

Very occasionally for broken bolts or studs these Irwin spiral extractors (also available from snap on)

For everything else and first preference is always the snap on parallel type

 

Had to use a blowtorch on the head and several tins of freezer spray on the plugs to get some overtightened tapered seat spark plugs out many years ago.

 

 

Edited By Martin 100 on 06/05/2017 14:21:32

Thread: The diesel controversy
04/05/2017 14:13:03
Posted by Mark Rand on 03/05/2017 19:02:06:

I think I must agree with Mick's comment above. There do seem to be a few predjuces being viewed on this thread. Just a few points:-

  1. Many modern car diesels use urea injection (Adblue) as well as pretty much all commercial diesels. This implies that they have NOx reducing catalyists, which use the ammonia formed by the dissulution of the urea to reduce the NOx to N2 and H2O. Adding extra urea is simple, cheap and isn't needed often. It's no more a maintenance issue than keeping the tyres inflated.

Euro 6 yes, but prior to that cars often have sealed tanks or bags of Eolys fluid / DPX42 fitted at the factory to assist with DPF regeneration and only in some case do they have the facility for the end user to refill the additive. Many require the intervention of the dealer or a specialist, some require entire additive tank replacement. That involves cost that many owners somehow can't bring themselves to bear, they bought a diesel to save fuel costs and can't contemplate paying anything to maintain the emissions systems on their vehicle.

A whole clandestine industry thus exists around DPF bypass, but with the visual presence now checked at MOT time it requires internal pipework leaving the casing substantially and software mods to remove detection of said bodge.

The end result is a vehicle producing more NOx and the same level of particulates as a pre-common rail diesel from 20+ years ago, because they are operating at significantly higher cylinder temperatures and pressures, the particulates are just dumped into the lungs of anyone on the vicinity, be it other car users, cyclists, pedestrians and those living next to roads, i.e. everyone. Those buying secondhand may be oblivious to the bodge, those owners actually commissioning the work and carrying it out are nothing but crooks. I'd jail them all.

The lack of effective testing for diesels at MOT time means bypassed DPF's and high NOx from a lack of additive is in most cases not even detected.

In-service exhaust emission standards for road vehicles

200+ pages of speciifc requirements for petrol emissons, listed model by model, and just one generic page for diesels (table 3 page 14, blink and you'll miss it)

03/05/2017 15:21:25

You do not specifically need Carbon to produce NOx, just something like air that contains nitrogen and oxygen. The NOx is only formed because of the combustion temperatures. Warm air up sufficiently by whatever means and you will get NOx. Lower the combustion temperatures and you reduce the NOx. Diesels generally have much higher combustion temperatures and pressures hence more NOx.

03/05/2017 13:36:09

Diesels will always be filthy things, yes even your modern 'Euro 6' things with all their save the planet claims by the manufacturers.

Long or even 'zero' service intervals on emission control systems mean any exhaust treatment on cars will be severely compromised compared to larger vehicles such as buses and HGV's who have the facility to top up with adblue (for example) on a regular basis.

So the really big polluters in our towns and cities are diesel cars of all ages and not the fewer but significantly larger vehicles some point their fingers at.

If you have the time this is one of the original reports on the huge discrepancy between the lab results and the real world and how some manufacturers like BMW are significantly more compliant than others. VW do not coming out smelling of roses. (If this is the one I recall it was the manufacturers are not actually named, but the identity is revealed by engine size data and photos of the test gear in situ)

**LINK**

Thread: Coal...
28/04/2017 10:13:26

What that glossy story about the Danes doesn't tell you is they regularly dump excess wind energy to the Norwegians at zero or negative cost, who then throttle their hydro generation, only for the Danes to buy energy back at full wholesale price later in the day. They also regularly dump excess energy at zero or negative cost into the German grid system, where there is already an excess from their own offshore wind turbines and with an ongoing lack of North-South transfer capacity within Germany to the major load centres in the south, which then causes the Germans to spill excess energy to the Poles and the Czechs, causing overload problems on their own grids that has led to them installing quadrature booster devices to restrict and control power flow through their networks. The Germans also have significant problems with too much solar PV so the wholesale price regularly goes negative, with solar plant constrained off the system to prevent local overvoltage and ultimately total system collapse.

Denmark has interconnectors to Sweden, Germany and Norway, but It is actually less interconnected in energy transfer terms than either Scotland, the West Midlands, North West England, Yorkshire or the East Midlands. Their total electricity market annually is around 10% of that of the UK. (30TWh vs 350TWh) That such a tiny country (Population similar to either Scotland, Yorkshire or the West Midlands) could 'for one day' generate 140% of their requirements from wind turbines is no real surprise, all it needs is a lack of conventional generation online (for district heating) an overdeployment of wind generation and a suitable weather system.

The UK has interconnectors to France (the first one was built in 1961) The replacement rated at 2GW was built in the early 1980's, with 1GW to the Netherlands, 500MW to the Repubic of Ireland 500MW and 250MW to Northern Ireland.

In addition we have an undersea 2.2GW HVDC interconnector from Hunterston to Deeside about to go live later this year, plus 3.5GW of multiple onshore interconnector capacity to Scotland, with significant onshore transmission upgrades in Scotland such as the Beauly-Denny 400kV circuits specifically built and upgraded to cope with Scottish renewables.

There are also additonal interconnectors to France, Norway and Iceland either already in build (Norway @ 1.4GW scheduled for commmsioning in 2021) or in advanced planning / seabed survey stage.

Also despite all the wind turbines in Denmark their CO2 emissions per capita are higher than the UK 6.51 tonnes vs 6.16 tonnes in 2015 despite starting at around the same level in 2005.

Their electricity prices for domestic consumers are also the highest in Europe and 40% higher than the UK

But when it's dark and not windy anything but renewables is what you require. Just over a week ago a Reactor was taken offline at Torness after 397 days continuous operation, it's now back in service with the next planned shutdown planned for September 2018, 600+MW 24/7/365, In excess of 5TWh per annum per reactor of very low carbon electricity and genuinely keeping the lights on, meanwhile circa 10GW of grid connected wind generation is right now delivering just 645MW and meeting just 1.8% of demand.

27/04/2017 16:02:15

Posted by Ady1 on 27/04/2017 15:03:41:

and for what? Nothing, absolutely nothing

How many windmills can you get for 100 billion quid?

From

https://www.iaea.org/PRIS/CountryStatistics/CountryDetails.aspx?current=GB

65149.00 GWh of generation for 2016

To take just the UK reactors still operational across their lifetimes (and ignoring the enormous contribution by the MAGNOX reactors)

Dungeness B1 89.36TWh

Dungeness B2 93.44 TW.h

Hartlepool 1 102.26 TWh

Hartlepool 2 97.68 TWh
Heysham A1 97.49 TWh
Heysham A2 92.86 TWh
Heysham B1 116.61 TWh
Heysham B2 111.90 TWh
Hinkley Point B1 135.46 TWh
Hinkley Point B2 132.33 TWh
Hunterston B1 136.13 TWh
Hunterston B2 130.22 TWh
Sizewell B 164.56 TWh
Torness 1 110.02 TWh
Torness 2 107.68 TWh

A total of 1718 TWh

That's about 170 billion quids worth of electricity at 10p a unit, five years worth 100% continual supply at the current rate of 350TWh per annum

Given the generation mix the UK would otherwise have used, the operation of those reactors has directly avoided the release of around 1700 trillion kilos of CO2 into the atmosphere that would have been produced by the equivalent coal fired generation (using the IPCC WG III median g CO2 eq/kWh) Plus the avoided Sulphur Dioxide, Nitrous Oxides, and particulates and millions of tonnes of very low level radioactive waste produced by every coal fired power station.

The savings in human life are also significant too

**LINK**

How many windmills for 100 billion quid?

About 30000 rated at 2.5MW. Lets assume 75GW nameplate capacity, that's some six times what we have now onshore and offshore. Site them all optimally offshore and you have a capacity factor of around 38% per annum, or 250TWh per annum of generation (theoretically 70% of our annual electricity demand) but with absolutely no degree of dispatchabity

Now lets shut all those dirty power stations down because they are no longer needed and in any case the operators cannot make any money to justify their operation.

You need to meet 53GW of demand at the winter peak and the availability factor for wind at that time is assumed to be 21% based on historical records.

The result? A high probability of electricity supply for less than 2 hours per day around the winter peak

Significant periods when supply fails throughout the year

Significant periods overnight when supply is ahead of demand and with no means of storing any excess

Clearly not a winning idea on how to spend 100 billion quid and nowhere near enough to keep the lights on across the UK

Edited By Martin 100 on 27/04/2017 16:05:57

27/04/2017 14:00:35

To continue:

The published £92.50/MWh for Hinkley Point C (and £89.50 for both if Sizewell C proceeds) is demonstrably lower than all offshore wind entries in the CfD register  and at a predicted output of 26TWh/ annum secures around 25% of our current domestic electricity needs for over half a century beyond 2027 ish and 7% of total electricity needs.

No existing power station or wind turbine or solar panel or Tesla powerwall is capable of either by basic design or a life extension to do that. Our oldest coal fired station operated for 49 years but churned out loads of CO2 and paradoxically, huge amounts of radiation in the ash and dust, way beyond permitted releases from UK nuclear plants. How much dust and ash? Well look at Gale Common, right next to the M62, partway between the A1 and the A19. Relatively flat land for miles around, yet a huge hill complex, the combined dust and ash output of Ferrybridge C and Eggborough power stations for forty years. Huge quantities of coal burnt, huge quantities of electricity reliably generated for decades, making a far greater contributoin to the wealth of this country than renewables ever will, but ultimately both are gross polluters.

I've not always been a fan of nuclear, sometimes quite anti, often upset by the pain and suffering coal has required to get out of the ground. Regardless of the level of new build coal, which incidentally has decreased noticeably in the past couple of years, there is a huge amount of new nuclear build ongoing across the world. Yes it requires huge capital investment but it just sits there for year after year producing low cost reliable electricity with near zero carbon dioxide. Taking the option of wind turbines and solar balanced by gas results in 469g CO2 eq/kWh CO2 for the gas portion, 12g CO2 eq/kWH for the wind portion as against around 16g CO2 eq/kWh for an all nuclear option (median figure table A.II.4 page 189 IPCC 2011 Special Report on Renewable Energy Sources and Climate Change Mitigation)

My first choice of nuclear reactor would not be the EPR as chosen by EdF for Hinkley but it will work, and be operational within a defined commissioning window, otherwise under the terms of the CfD we 'the UK' do not pay a penny, in additon we 'the UK' have an option to review after a number of years and there is an effective cap on returns to EdF. It's not the ideal solution of a UK wholly owned and financed national nuclear company but it's the best we can get at the moment. If we 'the UK' had not disposed of Westinghouse a decade ago things might have been different.

It is quite clear that local generation by solar or wind cannot demonstrably meet all local requirements across a typical day, at any point in the year without some storage requirements. When the demand is in an urban environment the deployment of sufficient generation massively exceeds the land / roofspace available.

Even if you could deploy sufficient renewable generation then storage using current or projected chemical methods cannot level the output of renewables to meet actual demand within the day, week or seasonally

The only sane, viable, long term solution to both meet our current needs and genuinely decarbonise our entire energy sector is nuclear fission. Fusion was 20 years away in the 1960's and as far away as that now.

For those that wish to mull over the facts of UK energy and the practicalities then I can recommend Without The Hot Air, a volume by the late, great Sir David Mackay, who from 2019-2014 was Chief Scientific Adviser to the UK Department of Energy and Climate Change.

As for a 'rather backward understanding of the system' maybe I've just wasted many decades in the power generation and transmission business on four continents.

 

Edited By Martin 100 on 27/04/2017 14:14:48

27/04/2017 13:59:59

All renewables, with the exception of hydro with unlimited rainfall are undispatchable in their delivery. They also have huge variation and thus the deemed contribution in calculations towards meeting peak winter demand from wind for instance is currently just 21% of nameplate rating. National Grid Winter Outlook Report 2016/17

Tidal barrages have a maximum load factor in the region of 16%, with a £168/MWh CfD being requested for Swansea Bay. £168/MWh implies a subsidy of around £140/MWh agains t current wholesale rates. So install a tidal barage with a very large quantity of concrete and aggregate and 320MW of tidal turbines to get an average of 50MW in spikes with a capital cost of 1.3billion, producing around 450GWh per annum attracting a subsidy of £63m per annum

Furthermore it would appear that phasing of multiple tidal generation around the coastline of the UK does not appear to provide any degree of levelling of output.

Green Mythology - Tidal Base-load Power in the UK

For that same 1.3 billion capital investment you could easily get the equivalent of 2GW of combined cycle gas fired generation (2016 completed build at Carrington Manchester £500m for 884MW) The only 'subsidy' that carries is that from the UK capacity market auction of around £20/kW/annum, or in the case of Carrington, a 'subsidy' of £17m, with a theoretical output of around 5TWh at 30% load factor. Of course unlie the tidal barrage you need to buy the fuel, but maintenance should be considerably less. Plus at 58% efficient it also produces relatively little CO2, but still way ahead of any nuclear reactor across its entire operation.

"The government certainly did not react to the FITS level of payments early enough, but they knew that more adopters were needed to keep the lights on at the time."

There was absolutely no shortfall in UK generation capacity, indeed as mentioned above UK demand across the year has fallen year on year since 2008, and winter peak demand has similarly fallen. We are now some 10GW down on our all time winter peak demand. Following many years of gas fired builds there was an excess of conventional generation, which enabled lots of plant closures under the Large Combustion Plant Directive before winter margins eventually tightened to breaking point.

Digest of UK Energy Statistics 2005-2012

Digest of UK energy Statistics 2012-Date

National Grid Winter and Summer Outlook Reports 2009 - Date

From the most recent winter outlook report wind turbines are deemed having an assumed availability aka equivalent firm capacity of 21% of nameplate for winter peak planning requirements, coal being 87%, nuclear 84%, Gas 88%, Hydro 86%, open cycle gas plant 94%, and pumped storage 96%. National Grid Winter Outlook Report 2016/17

Take for instance this past winter, with near zero contribution from solar and with 53GW of predicted winter demand, we'd theoretically need 240GW of wind turbines, some sixteen times the current fleet to possibly meet winter demand, and to cover a week of a blocking high with near zero winds, we'd need 7TWh of storage, some 750 times the storage capability of Dinorwig, and we'd also need the means to recharge that storage whilst maintaining supply, so we might need another 120GW of wind turbines.

Or to meet our entire current electricity requirements we'd need less than twenty Hinkley Point C's occupying around 430 acres a piece. (sixteen generating @3200MW, one on standby with three refuelling)

The source of the 430 acres? None other than HMG DECC who published this infographic and then someone, somewhere got very upset when presented with the facts and it was 'removed' Fortunately it was preserved by numerous publications.

27/04/2017 10:45:29
Posted by Geoff Theasby on 27/04/2017 08:50:58:

So, we may be moving to a reduced dependence on the National Grid in favour of local Microgrids, producing low-cost power most of the day. And if we have to use the washer only at night, is this not worth considering? After all, people who are entirely off-grid manage quite well, I've interviewed a few.

Electricity consumption in domestic premises is around 30% of our total national electricity demand. In daylight, in summer it can mostly be met by those with suitable roofs. The reality is many live in high density housing or do not have a suitably sized or oriented roof. and the output rarely meet even local demand.

Our domestic electricity requirements are a fraction of our total domestic reqquirements, and a fraction of the UK's annual energy requirements.

The reality is that solar is not low cost for 'everyone else' The feed in tariff for the earliest adopters (2010/11) of solar panels is now £506.70 / MWh That is for all energy 'generated' regardless of local (personal) usage, plus 50% of that produced is deemed exported and reimbursed at £35.70/MWh regardless of any measured export.

So a total cost of £524.55/MWh, a figure massively subidised by all consumers. Indeed if that rate was reflected in the costs to every consumer we would all be having annual electricity bills of around £4000 per annum even for the lowest consumers. These subsidies for existing installations continue for a couple of decades to come. Unsustainable and a massive subsidy for the already rich by those in energy poverty.

In comparison to this £524.55/MWh Hinkley Point C is priced at around £90/MWh and there are wind turbine projects under construction at £160/MWh and more, see CFD Register While the the current wholesale rate over the past day in the UK is around £31/MWh, with short peaks of £158/MWh and £231/MWh, and retailing across the entire year, all 8760 hours of it, to the domestic consumer at around £100-120 MWh.

But going back to the concept of local solar with local storage, If you factor in a 7kWh Tesla powerwall, with its limited lifespan, you do indeed timeshift your solar towards the 5pm / 6pm peak and may have some for next morning, but realistically only in summer. In winter you have 10% of the daily solar generation you have in summer, so a 4kW solar array producing say 3500kWh/annum will only have a daily output of 2.2kWh per day in December. Your daily consumption will always be in excess of what the panel and battery can provide, typically 10kWh or more per day. Five days generation with zero demand will recharge the battery, that will last 16 hours, for that it costs upwards of £500 per annum for a five year life asset.

Offgrid only works if you seriously compromise on modern devices and have a massive excess of roofspace over the average, or have the 'garden space' to accommodate a large (multi kW) wind turbine, or live on a hillside in a very high rainfall area with the possibility of microhydro. it also helps if space heating is wood fired, a possibility in rural areas but increasingly becoming untenable in urban areas, with smokeless woodburner exemptions being retrospectively rescinded for many existing 'compliant' devices in the years ahead. Extremely high levels of insulation with passive solar gain works too, but with a replacement cycles of around 100 years or more for domestic premises we are a long way from that, plus the current build standard for new property is light years away from what is actually required.

The issue is who pays for this solar / renewable electricity? £500/MWh is unsustainable.

The average homeowner would far sooner spend 10-15k on a kitchen or home entertainment or a new car than spend the same on super insulation, triple glazing and heat recovery ventilation.

Local battery storage can timeshift to some extent in summer but is useless in winter and across 26 million homes would cost around 50 billion pounds. for timeshifting around 21 pence worth of electricity per day per household or less than £400 worth across five years worth of the life of the device. A 50 billion pound spend for around 10 billion pounds worth of possible benefit..

The level of storage for the average property requires in the region of 70kWh to cover a week of domestic consumption in winter. Plus generation to meet storage recharging and the current demand. 4kW solar PV does not come close to meeting those requirements, 40kW might, but we'd then need houses with some fifteen times the current roof area. Gains in efficiency from the current 20% would not come close to meeting that shortfall.

On top of that the space heating requirements need to be met in a decarbonised world, On an annual consumption of 10-12000kWh per annum (3 bed semi typical) a demand of 350-400KWh per week would not be unusual in midwinter. At one time the target of 2050 for gas being used in any domestic properties was mooted.

As ever get the facts, do the maths, and then realise the reality. The sooner we stop mucking about with solar panels, wind turbines and batteries for storage the better.

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