epsilonGreedy

Mr President can I offer a more humane policy. All we need is a BBC subscription model that offers an easy-in and easy-out monthly payment model, the BBC would then get prompt feedback and experience financial pain when its editorial and political bias insults millions of Britons.

And I thought I was a political radical for wanting to defund the BBC. Mass execution of Eastender viewers is a final solution for the BBC I had not considered.

You will struggle to get more than 2kW on that gable end and the chimney creates a shading problem. I have a smaller hipped roof and hope to install about 1.2 kW. My motivation for doing this is that it should supply two people with hot water 200 days a year which equates to less wear on a gas boiler or ASHP and a £120 p/a saving. A DIY install would mean a 7 to 10 year payback plus @SteamyTeawill be my BFF which is an incalculable fringe benefit.

No home cinema plans for me, though I as get older I might invest in a 5.1 sound system in order to selectively crank up a centre speaker for more vocal emphasis. Too much modern video has an overly complex soundscape at the cost of vocal dialogue clarity. I would also like to embed some rear speaker wire in the wall of ceiling but this requires confirmation of a long term furniture layout before 2nd fix ends. If I go high-tech in any department it will be multi room ceiling speakers so I can listen to podcasts, audio books and music via voice control.

The unqualified "6000" cycles is meaningless. The Victron battery link I provided earlier has a properly specified definition of expected cycles, they need to do this because they sell to a more discerning market. VOLTAGE AND CAPACITY Nominal voltage 12,8V Nominal capacity @ 25°C 100Ah Nominal capacity @ 0°C 80Ah Nominal capacity @ -20°C 50Ah Nominal energy @ 25°C 1280Wh CYCLE LIFE (capacity ≥ 80% of nominal) 80% DoD 2500 cycles 70% DoD 3000 cycles 50% DoD 5000 cycles DISCHARGE Maximum continuous discharge current 200A Recommended continuous discharge current ≤100A

Boat owners particularly Americans often create higher voltage battery banks by connecting some batteries in series to create a 24v boat system out of 12 volt batteries. I think with some planning it is possible to config a single battery bank for both 12 volt and 24 volt outlets. At the end of the day were are just buying kW hours of battery capacity with various cell configs to achieve different output voltages at the terminals. One thing is becoming clear to me is that boat owners and self builders have a different perspective on the technology. Boat owners have been living offgrid for decades and expect to create a solution onboard from the individual components whereas self builders view offgrid battery power as a turnkey product. I came to realize after living on boats for months over many years that £0.21 for a kW hour of mains power available 24x7 at any time of year with zero generator noise is phenomenally good value compared to the alternatives. The following video shows how a boat owner created a Lithium offgrid solution ( their travel videos are more interesting).

I stopped mis capitalizing kWh about 2 months ago but you still hunt down same error by others usually within hours. It is most odd behaviour by someone who reacts badly when corrected over a more substantial factual error. Are you distantly related to James Watt?

At present a PV panel plus mounting tray plus flashing will never be cheaper than a slate roof covering unless a property is subject to a planning restriction that mandates welsh slate which is clearly not the case for the OP where the Council has installed concrete tiles. Natural slates in the £1.50 to £2.00 range will be fine for the OP.

Does anyone know how @JohnMo's roofer fixed down the temporary working platform seen in the photo above?

As discussed many times before you are creating a misleading expectation. A standard PV panel is 1.7m2 in area. The OPs roof will typically have 19 slates per m2 or 32 per PV panel. The saving in slates will be less because a panel is unlikely to match whole slates. Then consider the complexity of flashing around the PV array. As to costing: 32 slates cost say £60 compared to £150 low end for a PV panel + £30 for the infoot PV mounting tray. Adding in-roof PV makes long term sense but it will increase the cost of a roof recover job particularly once the PV array is wired up below the roof.

Says the man who posts 20 to 30 times a month claiming outrageous miscapitalisation of KwH.

Sorry but something does not add up, a competitive market should establish a sane price range over a period of time. A trusted name like Victron sells at £833 per kWh of headline lithium capacity. https://www.ebay.co.uk/itm/Victron-Energy-LiFePO4-Battery-12-8V-100Ah-Smart-BAT512110610-/253949300476?mkcid=1&mkevt=1&mkrid=710-53481-19255-0&campid=5338700537&toolid=10001&customid=1275_-1_54741006 Your example sells at £386 per kWh and includes fancy 19" computer rack mount packaging plus battery management control circuitry. From a sizing point of view it will be necessary to allow of 10% inverter loss and then add another 20% because 80% discharge is generally accepted as the deepest state of discharge that is considered desirable. For the OP and the 35kWh requirement this implies 46 kWh of installed lithium capacity = £886 x 46 = £38k + a very large inverter + plus charge management gubbins + a sizable plant room. Call it £45k depreciated over 12 years = £3750 depreciation per year.

"3GW" ? We won't have one that large until 2026 when Hinckley C comes online. https://en.wikipedia.org/wiki/Nuclear_power_in_the_United_Kingdom#Operating

My neighbour would enjoy sharing his views and frustration with you on this subject. He is building a fascinating semi underground off grid house with polystyrene blocks imported from Norway.

I have had long chats with my new self build neigbour who ran a renewables installation business for years. He tried to apply your logic for large PV installtions but the local DNO would decline such applications on the basis that the power limiting device might fail and whallop their local power lines with too much energy.

The 3.5kw product you quote is a suspiciously small package for the claimed capacity, I note they claim to have developed their own variation of the lithium battery compound. This leads to two possibilities, either you have revealed the breaking wave of a new generation of battery technology or you have linked to some eBay snake oil merchant. The following lithium battery review gives a better indication of the cost of mainstream lithium batteries. https://www.pbo.co.uk/gear/lithium-batteries-for-boats-reviewed-12-of-the-best-lithium-boat-batteries-tested-62244

No. I was using my previous experience of living on boats and being dependent on lead acid batteries. I hoped the later sentence, that you did not quote, highlighted the futility of running a home on battery power whens mains power is available. Long term liveaboard sailors are moving over to Lithium battery banks but these cost way more as you indicated. These sailors tend to cruise in tropical latitudes with PV arrays of 400w to 1000w. Their offgrid lives are sustainable with induction cooker hobs, washing machines, water makers and 12v lighting, however their daily energy consumption is much lower than a northern latitude house. Some of these sailors find PV+Lithium is enough and eventually ditch their onboard diesel genset but they always have the main yacht engine available to top up the battery bank on difficult days.

£7k to £9k. You would be looking at about 100 car size batteries or 40 huge two men to lift lorry size jobbies. Then add in the cost of building an extension to house these plus elevated insurance to cover the risk of explosive hydrogen venting off. Finally consider that this large bank of lead acid batteries would be exhausted after 3 years of deep discharge cycling. You could go lithium but now we are talking £30k, £50k or more.

Think they come on a printed canvas, surely you can hang wall paper? Or go high-tech and buy one of those new floor mounted narrow angle video projectors, you will have the largest home entertainment screen within 100 miles.

I expect better in Bristol, how about some trompe l'oeil, now this is what I call a feature wall. Or this:

Just tell Swmbo that it is an unusually big dedo wall as seen in heritage houses.

Something does not add up here. 40% of our electricity is generated by gas, so does the price differential point at some major inefficiency in electricity distribution? Whatever the explanation the Government will have to slap a carbon tax on retail heating gas otherwise ASHP adoption will stall.

He could claim his house is built over a roman villa and charge an entrance fee to look through your walk-on glazing.

Is that damp top left in the plasterboard?

You are bathing in a blast of hot air direct from the Azores, it should be 20 degrees. Did you leave the fridge open? Some Facebook friends just posted photos of the family in their inflatable summer hot tub.