This is our September 2021 performance figures for
our solar pv and Tesla Powerwall 2 here in the UK. Along with our Tesla Model
3 the Hyundai Kona electric usage. Plus other things that
have happened during the month. Hi John here and welcome. September was a
month of two halves for us mainly because the second half of it we were on holiday in the
Norfolk Broads on a cabin cruiser we hired. You'll certainly see the impact of not being
at home on our stats when we get to them. I'm actually considering going away more
often as it dramatically cuts the home energy usage. On Friday the 1st of October
which not strictly September but close enough. I picked up my stricken iMac from the Apple
store in Milton Keynes. After much testing and diagnostic checks they determined the
issue was caused by a faulty memory stick. I always install third-party ram in my macs as
Apple's memory is eye-wateringly expensive. For example 64BG of 2666MHz DDR4 memory is a £1,000
from the Apple store, which is actually slow memory in terms of ram speed. And the same
ram from a reputable third-party supplier like Kingston Memory for example is around half the
Hence I go with third party. But yeah that was a problem I've never had a memory stick
fail, and that was the problem. So I've only got 3 sticks in there as opposed to 4. But apart from
that it's all honky doory and no charge at all. So thank you very much the Apple store top work! Our
Kafia MA120 electric smart meter had its firmware updated pushed over the air sometime in late
September. And the fix was successful as our half hourly figures are now filtering through to
Octopus energy and historical data from way back to July has started to port over from the smart
meter. I'm now waiting for a bills to arrive, to be generated to cover the months from
July through to September inclusive. I also ordered a replacement 8m charging cable
cable from myenergi for our zappi version 1. The current cable has a break in the wire along
its length and it gives an intermittent fault. Sometimes the charging works fine, other times
even though the car is plugged in you get the 'ev disconnected' message
on the screen of the zappi. I worked out where the break was through sort of
trial and error of flexing and wiggling the cable. But decided a new cable was probably the safest
option rather than shortening the current cable to remove the damaged section.
The longer cable is
useful as well as it means I don't have to do the charging shuffle with the cars to ensure I can get
them all plugged in. The longer cable reaches both cars when they're parked where they are side by
side. I'm guessing going forwards I have to ensure that I don't wrap the cable so tightly around the
zappi and make it larger loops to stop it from flexing so much when I put the car the charging
cable away. An update on the Kona electric too. In my September stats video I told you
about the experience during the service that I had and there was also a recall update
that they installed at the same time, but they couldn't tell me anything about it.
link up here if you want to know more about that, go and check that out. On the back of that
experience I told you that I wrote and emailed Hyundai on the 17th August and in the letter I
requested they initiate a buyback for our car. No response to date from that letter.
I'm going to write another letter to follow up that previous letter and
send that off to them. However, I did get a response to my email of the 17th
August and they responded on the 28th September. No apology for the length of time to respond.
41 days to respond to a simple question of "Can you please advise me when step two of
the battery replacement will take place?" The answer they've given in the email,
I'll bring it up so you can have a look, is actually incorrect because they state to
book it in with your local dealer.
But they also didn't actually answer my question which
was what I was actually after in the first place! But I said it was incorrect, so why do I say it
was incorrect the information that they gave me. Well at the same time I had a letter around the
end of September from Hyundai it was actually dated the 27th September and within under
the heading 'What action should you take' it says in black and white there's no need
to make any bookings with your local dealer Hyundai Motor UK will make contact with you
and set up the booking when the vehicle BSA becomes available, this is the battery pack.
Which is what I was previously led to believe. They also state in the letter that the battery
will be changed anywhere between October 2021 and October 2022, citing battery
worldwide battery shortages as a reason. So it could be actually 12 months before our car
is put right. Until then don't charge over 90%. Don't park in your garage. Park it away from your
house and property.
Oh and there's £30 credit for your inconvenience which I can't claim as I don't
use their crappy app to charge our car with. As you can probably tell I'm
not best pleased with Hyundai. Do not buy Hyundai would be my advice. Cars
might be great but their customer service and support stinks. They have no empathy and
no ethos about putting their customers first. Okay brighter news. Let's move on to our
September stats. As ever I'll bring up the graphic on screen which you can have a pause on
the video if you want to review it in more detail. Alternatively have a look down
in the description down below there's a complete list of all our components
and the specifications of those components.
Let's move to look at the solar pv generation
numbers. For September 2021 with our south south west facing 6.34kW array we produced
a total of 627kWh on the 2 arrays combined. That's just 7kWh more than in August. And
I've found that looking back historically that September and August can often be
very similar in total generation figures. Our average daily solar generation was 20.9kWh
for the month. And if we do these sums of our total generation figure for the period divided by
the size of our solar array so that's 627 divided by 6.4kW worth of panels it comes out at 98kWh/p
per panel. As ever please drop your generation totals and your kwp performance in the comments
down below please. As you all know it provides a great comparison others. Loads of other people
read and comment on it and obviously I like to see them as well.
So thank you in advance for
that. If we look at the both arrays our 4kW array produced 394 and our newer 2.34 array produced
233. And you'll see it's very similar to August. Moving on, we'll have a look at the overall self
power chart. That's how we fared during the month for self-powered. As we were actually away for the
last two weeks in September I moved the Powerwall back into self-powered mode so it didn't pull
from the grid in the early hours of the morning. And we were self-powered from the
Powerwall and solar contributions for 78% of the month.
As you can see in the
stack chart 49% came from solar and 29% from the Powerwall. If you look at the 40%
solar contribution in August you might be forgiven and thinking that we had much
more solar in September to reach the 49%. And I guess that can be the downside of
looking at data and charts in isolation. As you know if you recall we produced only 7kWh
more in the month from September to August which certainly wouldn't equate to nearly
10% more self-powered from solar. So you have to consider other factors that
impact solar contributions to self-power, things like the amount of electricity the house
used and at what point in the day it was used. Was the power used during the solar generation day
or was it used once the solar day had finished. That gives you a much more rounded picture.
This chart is our year on year the
chart compares the months of September from 2011 through to 2021. It's 11 years
worth of data. Values for 2020 onwards are for both arrays whereas before then they were
just the single 4kW array. The 627kWh is the just a bit behind last year's total
of 697kWh. Yeah August year on year really told a similar story as well as September
so much better then than just gone through. Powerwall in and out char. I did say last
month I'd be waving goodbye to this chart as it's going to withdraw it and the reason
for that was the update the Tesla app meant the data wasn't easily viewable anymore to
me to find out the 'To the Powerwall' stats. In last month's video under the comments Salokin
stepped in and explained how to get that data.
So thank you very much for that. I'll bring up his
comment now. I've since redesigned my spreadsheet to calculate that to the Powerwall data as
it's now needed to do some simple maths and sort of to work out that data from the figures
supplied in the app. A little bit tedious but can be done. So well done Tesla for breaking something
that was okay with their new software update. I've been moaning a lot in this video, so sorry
about that. So there's our percentage 84%. I'll keep my eye on that because that seems a bit
low to me but I've double checked the figures so as far as I'm concerned it's correct.
But yeah we'll keep keep their eye on that. Day by day chart this gives you more detail of
what happened during day by day in September. Guess which day we left to go on holiday? And a
hint is I charged the car in the early hours off peak before we left on that day.
use is shown in blue. On the 17th September the day of our holiday started basically that's
when we went for the remainder of the month. The house usage was either charging the car via solar.
I left the Tesla plugged in, or we were heating the hot water via the Eddi on the solar. So lots
at the beginning and then for a little at the end. There's also towards the end lots of orange spikes
as the excess solar went back to the grid. We had so 2 days of high grid pull shown in red. That was
the 2nd and the 17th September and both those days we've charged the cars and added together that
equated to 92kWh. If we scroll down have a look at the 4 totals from the day by day. House usage gets
shown in blue is 743.7 versus our solar of 627. We'll come to the other two in a bit as we'll
have a look at them in these charts coming up. This is our average daily house usage and our
average daily grid pull usage over the months. Not surprisingly our average daily house usage
was up at 31.1 mainly because of the amount of car charging we were doing.
by the blue line. Our daily average pull from the grid was down at 9.5 which is the red line. Look
at what we sent back to the grid. We sent 156kWh of excess solar generation back to the grid
and the motto here is never go on holiday! This chart shows what we pulled from the grid
and we consumed 285kWh. Moving on to the eddi. Thankfully I was able to grab the month end
when we got back from holiday.
First thing I did when we got in through the door on the 30th!
The eddi heats our hot water from surplus solar. This month it diverted 37kWh of solar
generation to heat the hot water. For the year 326 and overall running total of
794. And then on to the cars with the zappi. The Tesla Model 3 covered 456 miles during the
month bringing its total mileage to 14,612. No issues or problems with the car.
We did 1 supercharging session and 1 public charging session where we added
a total of 38.46kWh all for no cost. We used the supercharger in King's Lynn for the
first time as well.
So that's another one ticked off the list of superchargers we've been to.
It's a bit like bird spotting isn't it, do a a chart of all the superchargers and
tick them off if you've been to them! Oh by the way Tesla announced it globally ceased
its referral program as of the 18th oSeptember 2021 until further notice. There's now no free
supercharging miles when you purchase a new Tesla using a referral code. Only solar installations
have a referral code. So that's a little bit disappointing but I guess in some respects
it probably also tells you the success that Tesla are having in terms of sales. Home
charging on the Tesla added 137.75kWh. And 38% of our total charge for the
month came from sunshine with 149.97kWh from the grid. This would have been at the
5.5p/kWh rate on the Octopus Go Faster tariff. So for August and September, when we moved
to that tariff, I've updated the costs in the relevant cells on the spreadsheet to reflect
that for both cars which you can see there.
The Tesla had 4 over-the-air updates during the month
and again I'm not going to go into the detail of what those are because there's plenty of youtube
videos covering those. Suffice to say it wasn't the American release of the full self-driving
beta but hey-ho! We're now on 2021.32.21. And that was downloaded and installed on the
24th September while I was on the boat. Actually I did it remotely so that's all good stuff!
The Kona covered 417 miles in the month and now has a total mileage of 13,014.
took the Kona rather than the Tesla on holiday as it's I guess more conventional to operate.
Perhaps it's only saving grace! I didn't really want to go through the rigmarole of explaining how
to use the Tesla key card, how to start the car, put it in gear, how to lock the car. And then
set speed limit and valet mode via the app. Plus I would have received notifications on
my phone every time they move the car about. Where we hired the boat from in Norfolk in Wroxham
we chose undercover parking which means you leave the keys with them as they often have to shuffle
the cars around as people return their boats or arrive to collect their boats.
The reason for
choosing undercover parking was I didn't want any well aimed seagull droppings sitting on
the car's paintwork for 2 weeks because it will basically scorch the clear coat leaving a blemish
which is almost impossible to get rid of even with a da rotary polisher. At least under cover it only
got dusty. So that's it! Any questions then dive down into the comments below and I'll pick those
up as always. Please comment, like, share and all of those actions help get this video shown
to more people on YouTube which again helps my channel grow. Thank you for watching and I'll
see you on the next video. Alright take care bye..