so this is my january 2021
solar pv and tesla power wall 2
performance here in the uk
along with our tesla model 3 and hyundai
kona electric costs
and usage so stay tuned
[Music]
hi john here and welcome in this video
i'm going to take you through
our solar pv and tesla powerwall 2
performance
for the month of january 2021 yeah it's
another month rolled by
plus our usual stats and usage
information for our tesla model 3
and our hyundai kona electric and my
energy eddie
and zappy in the description down below
is a list of all our components for our
system so
please have a look down there if you're
not familiar with our setup
it gives you all the components the
sizes the spec etc
also if i could ask you to please
comment like and share
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this video shown to more people on
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which obviously in turn helps my channel
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so thank you for that in advance for
those that do
okay let's get straight into it then
i thought for a change being that it's
the new year i'd actually start with the
cars
so change from our normal format
so the tesla model 3 has covered a
massive
21 miles during the month bringing its
total mileage to 8191 miles
i think actually that most of those 21
miles were when i was swapping cars
around on the driveway
to line them up for charging we've got
some one zappy charger
and i need to shuffle the cars around uh
to be able to charge
one uh which is the furthest away from
the charger
we have actually got a seven meter long
lead but it's not quite
long enough to reach both cars so i
ended up having to shuffle them around
to be able to charge both of them
one at a time although we only did 21
miles
we did pump in 139 kilowatt hours of
electricity into the tesla
for most of the month i was keeping the
cars around
sort of 40 to 50 state of charge to take
any advantage of the opportunity to
charge from excess solar
however towards the end of january we
had a potential of a hospital visit
some 150 miles away due to a family
illness
so it meant that i topped up the tesla
to 90 percent
so it was on standby for that potential
phone call and then that potential
visit or trip the 21 miles
covered in the tesla during the month
cost us 0.79
pounds per mile it's probably less than
that figure
as i calculated it using our average
agile costs
over the course of the month which was
11 94 pence per kilowatt hour
however as i always charge on the
cheapest rate during the early hours of
the morning
i know it will be cheaper than what i've
quoted there
but you know the figure's close enough
not to need a bank loan to cover the
difference
the kona covered 204 miles in the month
and now has a total mileage of 10 906
miles
all charging was done at home where we
added
86.38 kilowatt hours via the my energy
zappy
the 204 miles covered in the kona during
the month
cost us 0.05 pounds per mile
and again i've used that same average
figure as i did for the tesla
so that's the cars covered obviously not
much
mileage happening due to lockdown um
what else then oh yeah let's go and have
a look at some sunshine figures now
shall we
now i don't know if you've noticed you
probably have but
here in the uk it's now getting light
till around 5 p.m
and we're actually generating solar
earlier in the day
and also still generating later on in
the daytime now
so for example our earlier start of our
solar day
was 805 in the morning on the 31st of
january
whereas at the beginning of the month
beginning of january it was around 9 00
am
so that's the time when we actually
start generating electricity
from our solar panels
our latest end of day solar eg
when we are still generating and there's
a little bit of sunshine or daylight
left
on the 27th of january it was at uh 14
20 so 20 minutes past four in contrast
with that early in january it was around
3 p.m or 1500 hours
so yeah not massive increases but it's
nonetheless
encouraging so how do we get on then in
january
in january we produced a total of 210
kilowatt hours from our two separate pv
arrays
we had an average daily solar generation
of 6.8 kilowatt hours for the month
january was a bit sort of ping pong
month really
some sunny days some gray days and a
couple of snowy days
too you will see that when we look
at the day by day chart later but
even on the snowy days we did manage to
generate some
solar electricity once the snow had been
cleared off the panels
because it was a nice clear blue sky and
some sunshine so
it did actually manage to melt the snow
and allow us to generate some
electricity which is
good if we look at the split of both
arrays
our four kilowatt array produced 142
kilowatt hours
and our newer 2.34 kilowatt array
produced 68 kilowatt hours
comparing that to january last year with
an identical setup
you can see that we managed slightly
more in 2020
another 31 kilowatt hours over the
course of the month
and if you recall in early january 2020
cast your mind back we had a bit of a
mini sun fest
and actually february was really unusual
and jill's birthday's towards the end of
february and we were around and about
t-shirts um it was that warm
i'm don't know if we're going to get the
same this year but uh it looks
february's going to be a hard figure to
beat and we'll see what that is when i
do this at the end of
february so
you know how did you get on let me know
in the comments section how you got on
with your own solo generation
and if obviously if you have solar
i do really appreciate you commenting
and adding your totals
um down below in the comments of what
you achieved and your system size
other viewers also like to read your
comments too so it becomes a bit of a
win-win situation
so thank you in advance to those that
you who do comment and add your totals
it is really much appreciated by me
and others i like
so let's scroll on and have a look at
our percentage of contribution
the powerwall did and solar to our
overall self-power
our powerwall is in cost-saving mode
we're on the octopus energy
we're sorry we have octopus energy on
their agile tariff
a battery provides the power to the
house during our peak period
of 4 p.m to 7 p.m every day
every day so during january
we were 41 self-powered from the
powerwall
and solar contributions as you can see
on this stack chart here percent came
from
solar generation and thirty percent came
from the power wall
if we move down and have a look at the
peak and off-peak
self-power split the power wall did a
good job supplying the home's power
needs during that peak period between
4 p.m and 7 p.m within the tesla
powerwall app i've
actually extended the peak period time
slot out to 8 p.m
as electricity pricing could sometimes
still be a little bit high at that time
of night
so in effect the peak self-powered
figure here is from four
for four hours from 4 p.m through to 8
p.m inclusive
the percentages on this chart represents
the performance of the powerwall's
ability
to supply the house rather than pulling
from the grid
to meet the house's needs the months
along the bottom
are only populated with data when we are
in cost saving mode
with the power wall the red columns
represent the four hour peak period
and looking at january 2021's column
for 98 of the time in that four hour
peak period
we were on battery power with no pull
from the grid
so just two percent was grid energy
during that peak time
now i don't have the exact figures yet
for my electricity bill as it hasn't
arrived at the time of making this video
however i have extracted the data from
the octopus watchdog
app and it shows that we use 3.13
kilowatt hours
of usage for a cost of 90 pence
which equates to that 2 grid pull over
that for our peak period over the course
of the month
so small change basically
the green column represents the
remaining 20 hours of the day
and during that time we are on battery
and solar
for just four percent of the time
and we'll certainly see that percentage
increasing now
as the daylight extends at the beginning
of the day
and at the end of the day giving us a
slightly longer
solar generation potential each day
if we look at the year-on-year chart
so here is the month of january solar
generation
going back to 2012.
and 2012 to 2019 totals are for
our original four kilowatt system
the 2020 onwards of the last two years
are for both arrays and if you recall
the original four kilowatt array
produced 142 kilowatt hours in january
2021
and the new array managed 68 kilowatt
hours
giving us that 210 total that you can
see there
so after a fair start in january however
i think we will be trounced by february
and you can have a look at the the
column there um
when we get to that in uh next month but
i doubt we'll get anywhere near it um
because i said earlier it was so good
t-shirt whether in february
moving on have a look at the powerball
in and out
the power wall had a 90 round trip
efficiency for the month
for what we managed to store what versus
what it was able to supply
we stored 379 kilowatt hours
and the power was supplied 342
kilowatt hours
this is a day by day chart so it gives
you a little bit more detail on what
happens day by day
the legend for this is the blue is a
house usage
yellow is solar generation oranges
export to the grid
and red is import from the grid
and just looking at the sunshine side of
things
one really sunny day which was the 22nd
january
where we managed to generate just under
23 kilowatt hours which is quite
remarkable
the rest of the month was fairly low
numbers between sort of five kilowatt
hours and 10 kilowatt hours
each day so i guess in summary um
sort of low but consistent solar
generation
it's certainly better than december 2020
which is good thing because that was a
fairly
poor month
if we look at the overall totals chart
so this chart shows us our overall
totals for the four data sources that
we've just looked at
on the day by day house usage is
probably the key one
and which is in blue and that shows that
we've put we've used
uh 1.226 kilowatt hours
or 1226 kilowatt hours over the course
of the month
already covered the solar um and the
remaining two data sets on that chart
i'm going to cover in a bit more detail
on the following charts
so it's just there for completeness
rather than covering it in this section
that neatly we're going to go on to it
now
this chart looks as our daily average
grid
and house usage it shows
what we've pulled from the grid over the
course of the month
and our daily average house usage um is
down a tad
actually against december so it's at
39.6 kilowatt hours
from down from 40.8 kilowatt hours
and that's the blue line or the top of
that chart
and then on on averaged each day we
pulled 33.6 kilowatt hours from the grid
again this two is down from december's
figure of 36.5
that's the red line shown on the chart
so averages are down which is good
moving on let's have a look at what we
sent to the grid
that's what this chart represents so we
sent 8.2 kilowatt hours
of excess solar generation back to the
grid in january
real great improvement on the previous
month so yeah
a big up for january
in terms of what we pulled from the grid
this chart tracks that
so a total of 1041 kilowatt hours from
the grid
again less than what we pulled in
december so again good news
finally just have a look at the eddy so
this chart is for the eddy which
heats our hot water by diverting excess
solar energy once the
tesla power wall battery is full
small improvement on december's totals
and better than january last year but
still only 10 kilowatt hours of
electricity diverted from excess solar
for the year that makes 10 kilowatt
hours
since january i had to double check that
when i went in or 10 out of 10 that
can't be right but
yes january so for the year it's the
same as the month
gives us an overall running total of 478
kilowatt hours of diverted solar
to heat our hot water and obviously
therefore
not using gas to do it so there you go
so as i said right at the beginning
please comment like and share
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watching
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i'll respond to them
and i'll see you on the next video all
right take care
bye