it's an absolutely glorious summer's day here in Yorkshire as it always is at this time of
year and we're here at our smart home takeover and today we're looking at hot water heating
with a product we've seen on the channel before the Eddi energy diverter now as i'm sat here in
this glorious sunshine there's currently one kilowatt of power being exported from
the solar panels on the roof back to the grid now the purpose of the energy diverter is to put that
into the hot water tank now problem there you may not believe it but sometimes it rains in
Yorkshire sometimes we have no sun what about those winter months when we have no sun at all
how do we heat our hot water and yes we're going to have to use the existing gas heating system so
in this video today we're going to look at fitting this relay board that will allow the Eddi to be
the primary control of our hot water function but also integrate back up from the existing
gas heating system it may be hot outside but it's even hotter inside because i'm stood next
to this hot water cylinder that's primed full of red hot water that was heated by the gas
earlier this morning so top tip if you're ever doing that tell the owner to switch the heating
program off when you're going to be working in the cupboard but we're going to pay the price here
and what is that price well the price is that gas heating has been used to heat that water cylinder
up where we could have on a glorious day like this use the diverted energy from the solar panels
so what we're going to do now is fit the relay card such that the Eddi energy diverter can
interrupt the gas central heating to take priority over it so what we really want to happen is during
the day as the homeowner's out there's no EV to charge that energy goes into the hot water
cylinder to heat the hot water but if it looks like it's getting on towards the end of the day
the owner is due to come home from work and there isn't enough hot water that's been heated by the
solar panels the gas heating will kick in and make sure we've got enough hot water for the evening
so before you fit the relay card i can see you've got the EV comply app open what's the
thinking behind that well we may have misplaced the instructions last time but fear not Gary
because they're in the knowledge base section of EV comply so just have a look at the Eddi manual
and then we've got a digital copy of it all was to hand if you're using that app
and we've looked at EV comply in another video i'm sure you'll put it in the eye
above our heads or in the link in the description because it's a fantastic tool
for EV charging installs yeah so there was our uh showing the relay card instructions
so now we're just looking for the right wiring diagram here we're going to fit this as part
of an s-plan system but there's a lot of other variants this can this relay card can go into
so just dial through to find the right one well sorry so all bases covered because i've seen a lot
of heating systems before we get to that s-plan system yeah but yeah so yeah again this is there's
quite a modest heating system here there's a lot more complicated systems you can put in there
so once we've found the right instructions which are there we're ready to make those
connections now yeah that's it so i'll just remove the cover of our Eddi
you got any top tips when taking the cover off yeah well when dealing with small screws again
i like to put them back in so we don't lose them especially when there's plumbers parts behind
there we could drop something behind something and not get them back can you just explain the
connections to me uh yes just as quick recap so there's our incoming supplier that comes from the
fuse spur so essentially we've ran the supply to the immersion heater through the eddi unit
and there's the output to the heaters there's the option for two heaters and that little cable there
that's the one we're going to use to tap into the s-plan wiring system once we've fitted our relay
card all right so it's just two connections on the relay card is there many connections
on there there is it's quite a busy card because as we saw in those wiring diagrams there's lots
of different options there in terms of what it can do and we're going to use one of the simplest ones
here we just need to make two wired connections across one of the relays but first we have to fit
it looking for a little ribbon cable and some PCD spacers that we find in there okay a bit of care
now would suggest yeah that's uh yeah my hand's possibly a little bit too big for this but i can
take me back to my electronics roots here okay so those that it's going to stand on those studs and
just clip into place is that right yeah so the spacers just clip into the motherboard on that
of the eddi and then we'll just uh insert our ribbon cable into the slot there just to the
side of the LCD screen well that seems easy yeah there's no other commissioning to do the unit will
recognize it's got a relay card wow so it's just a couple of connections now but as it's a connection
i would suggest i'm going to see a ferrule crimping tool in a minute yeah since it's a yeah
a fine stranded conductor just yeah just in case we have to remove it i'm not saying we make any
mistakes in wiring but it just happens sometimes well i noticed you'd ferruled everything else in
there so i knew we wouldn't be getting away with it wouldn't be an efixx video without a ferrule in
so pop those two connections in and then you'll be down into the s plan heating system itself
yeah so yeah just yes there's two connections here again just across a normally uh
normally open relay contact that clicks in to instigate the heating so again just careful
small screwdriver for those terminals because it's a yes a PCB terminal so we don't need to
over tighten them well that was that was easy yeah and then again just pop the cover back on
and then we're ready to start looking at the integrated into our existing s-plan system and
if you're wondering yes it is incredibly hot in here and i am sweating so i do need a drink and
luckily we've got this Replenishh water bottle if you don't know who Replenishh are Replenishh are a
specialist distributor of EV charging equipment but they also cover the Myenergi eddi product
that we're using in this video as well so check out their website and link below and i'm going
to enjoy this water that's been chilling in the freezer so fitted the relay card into the eddi
energy diverter module and that relay card is now going to take over the boost function for the gas
heating so that means we don't need the existing heating timer that's upstairs next to the boiler
so we've gone up and we've removed that it's also not needed for the central heating system as
well because previously in this series we fit an Natatmo smart heating thermostat that also has a
timer function in it so now we've completely taken that timer out of the circuit if you haven't seen
the videos about the Natatmo smart thermostat check out the description or we will put an
eye somewhere above my head for those videos so the next stage is we now just need to connect
a relay board via the Myenergi Eddi diverter into our s-plan heating system so that's a case
of removing the cover behind us so you should take the cover off this Wago junction box with central
heating remind me the part number that'll be the 207 4301 check out the video we made showing
how we used it to correct the wiring in this cupboard that we inherited in a previous video
it's got the ratcheting mechanism we really like on the cord grips and also they're stackable
and it's just two connections on which part of the circuit you're going to interrupt yes i'm
just going to add i've added another Wago block in there and we're just going to interrupt the
power that flows in and out of the cylinder stat so again we're going to switch the water demand
on or off using that relay card so quite a simple process when you've obviously worked
out where those connections are within the joint box yeah so this is an s plan plus wiring system
so there's quite a bit going on in here but yeah it is just two simple connections to integrate the
eddi into the into the wiring and then cover back on wow that was thirsty work it wasn't strenuous
work but it was incredibly hot in that cupboard next to the hot water cylinder but we've fitted
that relay card in there and it now will trigger the gas heating to boost the amount of hot water
available in that tank now on that card we use the very simple option just coupling it into this
s plan heating system there's a lot of other options on there you can use the other relay
to trigger another heating element or perhaps if you've got a lot of solar in the installation you
could use that excess to start warming an under floor heating system as well other options on
there you can add a temperature sensor to actually monitor the temperature of the water in the tank
unfortunately this cylinder didn't have that facility so we couldn't use that on there it
will also you can couple in the input from an economy 7 system as well if you want to use the
off peak heating as a trigger to start that boost function as well so that's all built in there
a lot of powerful features in that relay board one thing you haven't seen during this video
and if you've seen our eddi video that we made before is a current transformer because the eddi
itself needs some signal to find out how much power has been exported from the property but
as you'll see on that we were measuring it because we saw that in the app and now that one kilowatt
of power that was leaving the building as an export has now been diverted into the into the
hot water tank behind us so where does the system get its current transformer information from the
secret we've covered in another video in the Harvi the Harvi is a wireless current transformer that
not only provides the current signal for this it also provides a current signal for the EV charger
we fitted in another video and that's a really clever bit of kit so i'll recommend you check
that out but as ever have you fitted the eddi energy diverter from Myenergi what did you use
the relay card to trigger have you used the relay card or have you got any other questions about
what we've covered in this video this again quite a simple installation you know we've we've maxed
it out with our renewable technology but we would appreciate your comments on the kind of projects
you're working on so please fire some comments in below and ask any questions that you might have