Circular reasoning (Rolfe's solar energy system)

I do have a lot of panels though... and it won't last. We'll have to start paying for EV electricity come November :( 🌧️
I can offer some help there. As a lead in you could start paying for some of mines to ease you in gently. No its OK I’m just that kind of guy, I like to help 👍
 
Not quite... I'm definitely not Australian 🙃 But have fully powered my EV directly from excess solar since I got it nearly 6 months ago :cool:

Why is that better for you than exporting the excess and charging the car overnight? I did that for the first three months before the paperwork came through for the G99, but after that it made more sense to sell to Octopus for 15p and buy for 7p.
 
Why is that better for you than exporting the excess and charging the car overnight?
We generate much more than we are allowed to export. So we can still be exporting our max whilst charging at around 4 to 5kW (or at a slightly lower rate if it is partially overcast).
 
I now have the figures for the first full year of operation with the export tariff. Over the 12 months from September 2024 to August 2025 I have made a profit of £354.64. Which I am busy spending on charging the car on road trips through the Electroverse card.
Does the profit include some write down of the value of your install? It does sound like a great result, then again we have had an amazing year for sunny days too.
 
Does the profit include some write down of the value of your install? It does sound like a great result, then again we have had an amazing year for sunny days too.
... who cares for anyone else, as long as its an achievement in your own mind, then its a huge positive (y)
 
I did say it's a great result, merely asked if any sort of write down of equipment cost had been included in the figures.
Probably difficult to calculate for personal use, a business yes there's a formula but personal use has many factors. A friend, an early adopter of solar, is currently getting £2.5-3k income from his system but given his age and state of health I'm not sure which will expire first him or the 25 year warranty.
 
Probably difficult to calculate for personal use, a business yes there's a formula but personal use has many factors. A friend, an early adopter of solar, is currently getting £2.5-3k income from his system but given his age and state of health I'm not sure which will expire first him or the 25 year warranty.
Agreed, for me, I'd look at either the length of time of any loan used to purchase the system (my case 60 months) or over a 10 year period in a linear fashion i.e. 10% per annum.

It's not important, just interesting to see the results and if Rolfe is happy and I'm sure she is, thats all that matters.
 
I always work on the money that has been made by exporting but, you also need to factor in the money saved by charging the battery at cheap rate and using it during the day/evening when the tariff is high, my current bill from TE is £17, it used to sit around £100 a month and I didn’t charge a car then. Reminds me I must go and work out my current use at today’s non TOU prices. 🤑
 
It's quite hard to compare when you've added in so many variables, without the car I wouldn't have paid for as much energy, without the Zappi I wouldn't have access to OIG and smart charge during the day. I suppose the best way I can compare is that my average rate over the last 6 months is 13.79p kWh.
 
I merely meant that after paying for all the electricity for the house and the car charging, I was nearly £355 ahead of the game due to the amount of solar I exported. Of course I had no electricity bills and no petrol bills. Life's too short to be calculating the whole caboodle, particularly since I can hardly go back and undo the purchase!
 
More toys to play with - or hopefully not to play with, as this is an emergency back-up system.

This village was once notorious for lengthy power cuts, I'm told, but over 20 years ago the grid supply was upgraded and run underground. In all my time here I haven't had a single really worrying outage, although on my very first evening here, just getting ready for bed, surrounded by boxes, it did go out and stayed out until about three in the morning. But that's probably the worst one I remember.

However, you never know. Now I have a home battery, whenever there's a bad storm I think, this is nuts. Plenty electricity, but it won't work without mains input. This is just silly. So I've splashed out on an EPS facility to add to the system. If the power goes out, the central heating boiler will continue to operate from the home battery (and that will heat the water tank as well), and I have a double power point in the fuse box cupboard that will be live. From that I can run extension leads into the living room and kitchen to power the necessities. So now I think, how would I operate this if it ever turns out to be needed? I'm thinking maybe a four-socket extension lead from each of the live sockets.

Living room
  • table lamp
  • TV
  • computer (has a battery so could be plugged in intermittently)
  • landline phone (might need 2 sockets with the new system)
Kitchen
  • table lamp
  • wifi router (in hall just outside the kitchen, essential
  • kettle, microwave, toaster really only need one socket as they won't all be plugged in together
  • chargers for phone and so on
That would probably work OK. Then at night, in a prolonged outage, the fridge and the freezer could be plugged in overnight and the'd hold their temperature reasonably well during the day. I'd just need to watch that just about everything else was turned off if I wanted to boil the kettle, or I'd trip something. The battery won't deliver much more than 3.5 kw.

I'd also have the option of running another extension cable in from the car and using that directly - as I did this morning when the whole system was off for the installation. I was able to hand the electrician a mug of hot coffee while he was working with the electricity off.

I usually sleep upstairs, where it would be difficult to get an extension lead, but I could move into a downstairs bedroom for the duration and get power in there for a light and an electric blanket (these things always seem to happen when it's cold).

For a day or so this would be absolutely fine, but what if it was more prolonged? (A friend of mine lost power in Sussex for a fortnight after the big storm of '88.) So long as there's a working charger close enough I could go get more electricity there. There's a big motorway service station with a stack of Applegreen chargers about 22 miles away, and Edinburgh is closer than that. However, I have no way (at the moment anyway) of getting power from the car into the home battery. I have no real idea what the boiler takes in a day - it depends on how hard it's working, and of course it cycles on and off.

The solar will provide a top-up for the home battery during the day, but if the weather is bad I think it's possible it won't be enough. Of course I could run everything but the boiler directly from the car and just keep whatever is in the home battery for the heating, and probably over the days there would be enough solar.

I have to beware of hoping there will be a power cut just to try this out! It's just in case, for an emergency. But I do need to think about what I would do, to be prepared just in case.
 
Maybe invest in a couple of portable rechargeable batteries? Paraffin heaters? Camping stove running on gas cartridges? You can get low power kettles for camping etc and a simple telephone which doesn't need a power socket just a phone line. I have one handy for such an occasion.
 
I was looking at portable batteries, but I don't think they're really what I want, or what I would need. This whole exercise is intended to avoid the need for paraffin heaters and calor gas cartridges! Also, I don't need a lower power kettle, I just need to switch most other things off for the couple of minutes the normal kettle takes to boil. Or use the VtL to boil the kettle as I did this morning.

I do have a phone such as you describe, but since BT insisted on switching me to an internet phone, I think I might as well chuck it out. There's no way it would work on the new system. I have my mobile though.

I think it will all work fine if it ever actually comes to that.
 
That's a bit 1970's if you've got home energy battery system and EV with V2L ⛺
I guess but for a prolonged outage with little or no solar you will be hard pushed to run everything off a 13A socket.. a gas cartridge stove is a no brainer, 1970s or not.. or even a woodburner fire, now that is going back :)
 
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