Plus I found a youtube video on icewind. www.icewind.is which you may find interesting Bob 

@boblochinver, that all sounds very sensible to be honest. Given the push for ASHP adoption, I think we're going to see some major developments in the years ahead, where machines will get even more efficient.

@chris-in-kemnay i get that the RHI will help my costs but the grant/loan is still cost just now spread out over time but I’m one of those people that like to just pay for something outright and not worry about continued payments in the future. I agree the RHI would help cover the cost but not the fully cost of the ASHP I would need for my size of house and I suspect I would go for a bigger one to ensure it did cover the heating requirements. I think your close by so always welcome to pop in when we are out of lockdown. 

@boblochinver

Posted by: @boblochinver

I’m one of those people that like to just pay for something outright and not worry about continued payments in the future.

Yes Me too Bob, but this and the car just made so much financial sense at no cost. I'm saving 20p a mile on the Tesla versus the Xantia and I did all the servicing myself. In reality if I garaged it for service etc. its more like 25-30p/mile. The HP saves us 15,000 kW of gas (I can't tell you the cash amount as I didn't have the foresight to separate the combined bills doh!!) for a cost of 2000kWh rise in Electricity and some of that is the car.

Posted by: @boblochinver

I think your close by so always welcome to pop in when we are out of lockdown. 

Close, but not that close 🙂 4 hours away on a good day

I prefer my motorbike but the milage on electric motorbikes is still a bit of a ways to go for full enjoyment for touring. 4 hours is nothing !!! 

@boblochinver That almost used to be my commute every day for almost 13 years. Christchurch to Heathrow 196 miles a day, 3000 miles a month. (couldn't afford to get a car) I retired her in 1997 with 330k on her. She started off doing 45 mpg new in 1985. When I retired her she would do 66mpg. She's in the garage awaiting  a little bit of TLC. It would be nice to out for a run for pleasure again, I miss that.

@chris-in-kemnay oh what bike is that ? sounds like fun, I currently have a 2019 Honda Goldwing 🙂 

@boblochinver Its a much modified BMW K100RT. with an RS rear bevel drive 10% more efficient, an American gearbox 15%, a K100 LT balanced exhaust 10%, a K&N airfilter, an Acryber higher screen probably -3%, Plus a very comfortable KQ seat. It was completely repainted before I put it away and will need all the rubbers and wiring replacing, but the engine is a brick, rebuilt at 100k and very reliable. Sorry for being off topic.

@derek-m and Bob - whilst I appreciate H2 could have some future for very high energy users (steel production), I really think it is the fossil fuel industries last gasping breath to suggest H2 down gas pipes.  Especially at 40%.  That means 60% is still burning fossil fuels and generating CO2.  Plus the creation, compression and transport of H2 is 70% less efficient than electric.   H2 also burns far faster, so needs new burner technology or it explodes.  And the pipes leak as it is such a small molecule.  So it is a NO from me.  

I got distracted by the topic - sorry.  I can't make the battery numbers stack up.  You need the biggest solar PV system (I only have 4kW), use Octopus Go to charge overnight.  And the battery to drive your home when no solar.  Then about a 10 year payback.  No thanks.  I think Vehicle to Grid (V2G) is the answer with your EV car.  I have a Honda e with a small 28kWh battery in the garage.  Why do I want to spend another £8k on a Tesla battery when I have my car sitting doing nothing 90% of the time.  V2G is being trialled for the CHADeMO connection.  We need it urgently for the CCS connection in the UK as only Nissan Leaf still use CHADeMO.

In my view (I have 7kwh of batteries and solar PV) batteries are totally worth it. Mine provided 31% of my supply last year and "paid back" £233 of their cost. If you were on a tariff where power was cheaper overnight they would be even better, especially in the winter, when PV is low. I've had my batteries 2 years and they have returned 27% of their cost 

Hi Batalto

please can you explain the £233 paid back maths calculation. 
What is the size and price of your battery set up?

I can understand “free” solar PV electric to charge the battery during the day  Or cheaper night time electric (bat that might save 10p per kWh  So that might be 8kWh per night or 80p assuming full charge and discharge  80p x 365 days = £292 saving per year  which matches your number above  

but an 8kWh battery system is £10k?  So 10000/292 = 34 year payback 

or have I over priced the battery system?  Anyway I’m glad you can make it work  I think I can through V2G, but not a separate battery 

appreciate your thoughts