Marvin

What a crock of ......t! I don't know where to begin! Sap man may be right that SAP calcs are about as good as EPC calculations and assumptions (don't get me started about EPC's) but as efficient as opening a window? That's utter bollix. Hi @ruggers In my world, when you open a window to let air in you let other air out, Our home tends not to expand like a balloon. In doing so the temperature of the air going out is replaced with the temperature of the air coming in. So when we open a window on a very cold winter's day, the outside air at, say, 5C replaces the warm air in our home. However on the same day the air supply from outside via our MVHR is usually around 20C. This sounds like a small thing but when the maths is done over 24 hours and 365 day a year its a lot! If the outside temperature at our home is -1C we will use about half a kWh replacing the temprature of the air using the MVHR in an hour. If instead we opened windows and replaced the air in the house at the same rate as the MVHR we would use about 2.5kWh an hour. Our MVHR uses 25 to 33 Watts an hour. I am completely satisfied that using an MVHR helps to keep our home at a more stable temperature (resisting both hot and cold outside temperatures) and saves us energy and saves us money. Its the gift that keeps on giving... Good luck with your project M

+1

@pocster?

What options are they saying are acceptable?

Hi @kommando Interesting article. My take on the situation is that gas prices will go down but peoples available money to spend on the basics will go a lot lower causing energy to still be a high proportion of income. Time will tell.

This is mad thinking.

or move the gate 5 meters down the drive (if practical) so when a vehicle is waiting to enter its not causing an obstruction. Depends on the road category as to if this thinking applies. Good luck M

No. They think we're desperate. You'll have to decide the answer to that one yourself.

Yup! Avoiding the rocket science answers is almost always the best approach.

Having theories is a good way to develop solutions to problems. Using the common sense approach is often a good way to check your sanity. and @joe90 comment above is just that!

Having read up on the LuxPower Squirrel POD inverter system I would suggest that you work out how much more storage you have on your wish list and see if it will all fit near the consumer unit in the cupboard or aim for the garage ensuring you have a suitable ampage 240v cable to carry your expected peak demand, over the distance between CU and POD inverter and installed in a fashion suitable for the ampage. I'm sure you know concrete is used for massing in a building. If the cupboard gets hot and the concrete walls warm up it will take ages to cool down. My inverter manual says do not touch it can get hot.... Probably best to speak to supplier about what you hope to put in cupboard and ask about overheating.

IMHO I cannot see materials becoming cheaper in the next 2 years, and so we are installing everything we can now. But this does not mean I am right just my opinion. Time will tell. What your motovation to build and your financial position are will influence others opinions.

In our case, extended CT cable with Cat 5.

If running at low voltage like my 12v DC system, the nearer the panels to the storage the better because of the voltage drop. Also installed large cable between, batteries and pure sine wave inverter and kept them as close as possible. As soon as you convert to 240 AC normal cable rules apply. The 150ish DC volt system I upgraded to 6mm cables as I expect to benefit from thisforthenext 20 years. I think the distances around your inverter is because it can become hot. So again best not in a cupboard.

Hi @Confused123 when looking at the photos I notice that the board on the side of the flat roof is exposed more than it was suggesting that the flat roof has be raised at the ridge end.

PV+EV+House+MVHR+ASHP+hot water: Last 60 days total power purchase cost: Mains power used: 318.75kWh @ 24.0762p/kWh plus VAT £80.58 Standing charge: 60 days @ 22.9524 plus VAT £14.46 (Average 4000miles a year) Additional EV charge purchased away from home 42kWh @ 0.52p/kWh inc VAT £21.84 60 days of PV power (Material supply cost etc divided by 7 years no including my labour) inc VAT@ 1.56 £93.55 Total for 60 days: £210.43 or £3.51 a day

Lots of weight from the top set of purlins that seem to be unsupported within the required distances, this would weigh the roof down? https://www.derbyshiredales.gov.uk/images/documents/B/BC Guidance Note Purlin and Rafter Sizes.pdf

Worth getting an understanding of what the surveyor considers the rectifying works would entail in the worst case scenario. Then you have an understanding of the risks you would be taking on.... Drains problem: CCTV survey £200? Then you will know better the extent of the problem your facing Drains fix along side of house: Lined ? Inspection of foundations? Possible underpin of side wall?

Any suggestions on what to use?

Can anybody tell me what Utilisation Category an ASHP is please.

Welcome to buildhub @Rhoda

Yeah, accept for the daily charge and VAT......

My small ASHP runs on standby at 90Watts, so in 1 day 2kWh or 60 a month....

Reading the Data Ducting Infrastructure for New Homes - Guidance Note it states, on page 18, that in our circumstances the duct to be used to go from the point of Termination in the road to the terminal box on the outside of the house can be 30mm internal diameter minimum. The duct will travel under the front garden area and under the path around the house to the Terminal Box. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/11496/dataducting.pdf Has any one experience with this? What size ducting did you end up using? Can I use black and wrap in green fibre optic tape? I want to do this before they install the POT in the road.... ( soon)

FHi @JamesPa In the above report, page 62 to 68 (as shown on the bottom of the pages) cover buffer tank sizing and cycling, and figure 51 on page 64 is used as a decision guide. Also depends if the emitters are controlled as one or divided and therefore the flow is divided.