Eddi not heating water long - config required?

irewestlad

Hi

I have a good PV system installed along with 6Kw Inverter and 5kWH battery. Any excess power is passed to the eddi where it heats the immersion. One thing I notice is the eddi doesn’t stay on long before the “Max Temp Reached” appears on its screen. We do get piping hot water after it’s been on but we’re still supplementing with the boiler. It doesn’t seem like we would get a full tank of hot water from eddi alone.

I’ve checked the setting on the immersion rod and it’s set to max and is a 36 inch rod. We’re exporting up on 20kwH per day in the last week so I wanted to double check there isn’t something else I should be doing to ensure the eddi could be staying on any longer which would allow us to turn the boiler off.

Is there any additional config I need to check on the eddi?

thanks!

Nolars

Recently got eddi installed but on the boost options it's showing two options?

championc

https://www.boards.ie/discussion/comment/118869417#Comment_118869417

Yep. And ? What were you expecting ?

Nolars

https://www.boards.ie/discussion/comment/118869652#Comment_118869652

How come the boost 2 is on when excess is going to the water? I just assumed it would be boost 1? I must look more into it I'm not familiar with it yet

championc

You'll need to post screenshots, because I've no idea as to what you are referring to

Jonathan

Is it a dual element immersion? Are you heating the sink element rather than the bath element? They usually share a single thermostat, which would cut out but with only top of tank hot.

irewestlad

Hey @Jonathan

Im not sure if it’s dual - I presume it is as it’s a relatively new tank.

how would I check if it’s sink or bath?

connesha

Check the load the eddi is sending.

Normally the sink is 2kw and the bath is 3kw

irewestlad

Hey @connesha

good point, I’ve never seen the load going to 3kw. How would I change it over so that it’s heating the bath element?

Ha Long Bay

Do you have the myenergi app setup? You can set the priority there for tank 1 and tank 2. I'm sure that is easy to set on the unit itself as well.

connesha

Use boost to determine, rather than waiting for excess.

When tank is not boiling, boost heater1 for a few mins, see what’s being sent.

Then boost heater 2.

if one is 2kw and other is 3kw, then set the 3kw one as the priority. This will avoid wiring change.

irewestlad

@Ha Long Bay , no don’t have the hub (but I hear the new zappi will have it integrated - anyone hear anything about that?)

i changed the priority this morning between Heater 1 and Heater 2 on the eddi itself. @connesha I’ll try that boost trick and see what results I get, cheers

Tree

It depends on what it's connected to, for a 2 element immersion (bath/sink), you probably have boost one connected to one and boost two connected to the other. If you've got immersion and some other component, then it'll correspond tot hat. Get on to your installer is probably your best bet

graememk

And for 2 element immersion using the sink is pointless as priority, as the thermostat is tied to both.

When the sink one gets too hot it will cut out both.

System

This discussion was created from comments split from: Solar PV Hints, Tips & Troubleshooting.

Jonathan

Merged these posts from Hints, Tips and Troubleshooting over.

Will add an item to the FAQ later as same issue posted twice in 24 hours.

stimpson

https://www.boards.ie/discussion/comment/118873067#Comment_118873067

I don’t think this necessarily true. I have 2 separate elements for my immersion (300l factory insulated tank). I know that many of the older ones had a dual element with a single stat.

My Eddi will heat the top one until the stat kicks in then it heats the bottom one until that stat kicks in. Then it tries the top one again and so on. Here’s yesterdays graphs:

In the Eddi manual it says that you can install a De-stratification pump which will pump hot water from the top to the bottom of the tank and can be driven by one of the Eddi channels and will ensure the whole tank gets heated even if you only have a single element. See page 50 of the manual.

https://myenergi.com/wp-content/uploads/2019/04/eddi_manual_v2.3_english.pdf

irewestlad

Ok so tried the boost option from the eddi - Heater 1 drew 2kw but Heater 2 drew nothing (0kw). Does this suggest it’s not set up right or the second rod is gone in the immersion? I’ve attached a pic of the cap of the immersion which suggests Heater 2 should be 2.8kw.

92DBD07B-60BC-4020-A049-20A5838E87FB.jpeg

mp3guy

I have the same element. Is this something as simple as you already heating water with the boiler before the Eddi gets a chance to heat it during the day?

irewestlad

@mp3guy, I don’t believe so, I turned off the water oil boiler time yesterday and the hot water ran out today after two showers. It was after the hot water ran out I tried the boost trial which I mentioned about in my last post so in theory I should have seen the full 2.8kw go to the immersion

idc

Do you happen to still have a switch for bath/sink ? As I have a dual element the eddi is connected via original wiring with the bath/sink switch still in use!! Just leave on bath all the time (if I change tank I would get a better configuration of heating elements and thermostats)

As heater 2 drew 0k can you check if it's even connected to anything!

irewestlad

I don’t seem to have a bath/sink switch. I think I’ll need to get a sparks out to check the wiring for me. It would appear that Heat 2 isn’t connected at all!!?

graememk

https://www.boards.ie/discussion/comment/118874232#Comment_118874232

I was careful in my wording there, I specifically said the dual element immersion with a single stat, not dual immersions.

Dual immersions are a completely different ball game. Perfect for that.

stimpson

https://www.boards.ie/discussion/comment/118876523#Comment_118876523

You actually said "2 element immersion" which is a little ambiguous.

niallers1

I had this problem, Looks like the sink / bath switch might be wired the wrong way.

When I press the switch to sink it heats the 2.8kw element and when I switch to bath it heats the 2kw element.

bullit_dodger

https://www.boards.ie/discussion/comment/118889941#Comment_118889941

If that's the case, no wiring required.....just change the "Priority" on the EDDI (I had the same problem).

irewestlad

But my problem is that there is nothing being sent when I put on Heater 2 (Bath). It hasn’t been wired correctly. I have a sparks coming out soon to have a look at it. Thanks!

irewestlad

Thanks for everyone's insights here, it turned out that the Sink immersion rod was wired up. It's been changed over to the bath rod and I'm enjoying a hot tank of water everyday now

Black_Knight

Newbie questions here.

I've an Eddie which appears to be tipping away at times (500-600W being consumed) and says "Max Temp Reached", yet i've no hot water. Tank 1 only shows activity. Tank 2 has no activity.

1. How can I tell if i've a dual element immersion or not?
2. What's the eddi doing with this power given i've no hot water?
3. WTF is going on?

Thanks all.

graememk

What happens when you hit boost on the eddi? What power does it use?

Max temp reached happens when the immersion cuts out

Black_Knight

https://www.boards.ie/discussion/comment/120448306#Comment_120448306

Nothing. No power is consumed. It looks as though it's going to boost, but then switches back to Max Temp Reached after a few seconds.

I've been told it's a single immersion tank.

So from my understanding, the immersion dictates when to turn off the zappi? But how? Isn't the immersion just a heating element that's either on or off? What sets the temperature?

graememk

https://www.boards.ie/discussion/comment/120448887#Comment_120448887

Have you ever used the immersion pre eddi?

Is there a little red button on your immersion?

If you dont see it, It is likely to be under the cover, (turn the eddi off)

There is a overtemperature switch that can be triggered.

Normally the thermostat in the immersion cuts out the immersion before it gets too hot, That extra thermal cutout is an extra layer of protection.

If its popped out, you can push it in with something.

If that doesnt work, the immersion could be busted.

(if unsure, post photos and can work from there.)

Black_Knight

https://www.boards.ie/discussion/comment/120448950#Comment_120448950

Cool. Thanks for the detailed reply. It's a new tank and new immersion. I'll have a look shortly.

Can I just set the Eddi to 0 to turn it off when I'm having a look at the immersion for the overtemperature switch?

graememk

https://www.boards.ie/discussion/comment/120449188#Comment_120449188

Yeah the button at the bottom of the eddi completely turns it off. I think its on/bypass/off. I think bypass just switches on the immersion. (Or even just flip the mcb for it, to be sure)

Is there any other switches or anything between the eddi and the immersion?

slave1

There's a hollow tube alongside the heating element, inside this is a temp stat that dictates when max temp reached and the immersion will turn off.

Black_Knight

That seems to have been it. Adjusted the immersion and boost boosted not a bother. Solar put a bit into it too afterwards. I'll keep an eye over the next day or so

Liam2021

Just wondering is there a way I can stop the eddie using solor power to heat the water. Currently on energia ev plan so it would be worth more to ne to export all the power generated during the day and not heat water

con747

https://www.boards.ie/discussion/comment/121821034#Comment_121821034

Just turn it off at the switch underneath it? Might be a way in the settings as well but not sure.

graememk

https://www.boards.ie/discussion/comment/121821034#Comment_121821034

Or put the export margin to 6000w

bullit_dodger

https://www.boards.ie/discussion/comment/121821034#Comment_121821034

All those good suggestions and will work fine, but easiest is just to use the "Stop" function as that's exactly what it's for.....(under "Settings")

Then you can still have the timers set.

Liam2021

https://www.boards.ie/discussion/comment/121821748#Comment_121821748

Will this mode keep the schedules I have set for cheap tariff tines?

slave1

https://www.boards.ie/discussion/comment/121824869#Comment_121824869

No, it's a total stop.

Another alternative is to just stop on the App so then you can control from anywhere, if you change the export margin then you are tied to having to use the physical EDDI as this cannot be changed via the App.

I'm in the exact same boat and just use the App in the morning to turn it off, if evening showers required I check the hot water temp and then can throw the EDDI back on for a while via the App until temps good enough

Hellrazer

You could just limit the EDDI to 1 amp - Settings - supply grid - device limit.

It will only draw (or should I say use) .24 kilowatts.

Then if the solar is generating the rest will be exported or used to charge your batteries.

Then schedule a boost on your EV rate at the times you want. A boost will over ride the grid supply setting and provide full power to the immersion.

Tree

I can also recommend* going down the home assistant rabbithole, cause then you can programatically stop/start/boost...

*I am not responsible for your sanity, operating system, budget, or spending the rest of your life chasing little automation tweaks...

OO7FITZY

Appreciate if anyone could help with this issue I have today

Eddi has been consistantly heating my hot water every day for the last year since I got it installed as part of an overall solar PV/battery system, but today for some unknown reason it suddenly stopped?

Odd thing is it heated the water for 20 mins this AM as per manual boost instruction, but then when I tried the boost function again later today it did not heat the water

I can clearly see on the myenergi app that is it not pulling down any Kw to heat the cylinder and the battery is not draining either and the water is cold (even though the app says it is boosting as does the screen on the eddi unit)

The myenergi app also shows no usage (except the 20 mins boost this AM) - all other boosts have failed

I have always used the boost function manually through the app and no issues

I've tried the manual boost function through the eddi unit and that also does not work

I've turned the unit off and on using the switch at the bottom of the unit and repeated above steps and that has not worked

I'm lost as to what the issue could be?

graememk

https://www.boards.ie/discussion/comment/122006005#Comment_122006005

Check the over temperature trip on the immersion, it's likely that has tripped

ratracer

https://www.boards.ie/discussion/comment/122006309#Comment_122006309

Do you know if the over-temp trip itself can become faulty?
I have similar issues, but there is never a feel of that resetting. I can hear the thermostat on the immersion clock on and off if I adjust the temp on it.

OO7FITZY

THX GRAEMEMK

I'll search it up in the morning - is this something I can do or do I need an electrician?

graememk

https://www.boards.ie/discussion/comment/122007014#Comment_122007014

Some immersions have a red button on top that you press back in to reset.

Others is under the lid (caution, potentially live terminals, switch eddi to off, and not bypass) ones I've seen is a tiny white button that you need to push in with a small screwdriver.

If unsure take a picture and see.

If it keeps happening more investigation is needed.

https://www.boards.ie/discussion/comment/122006833#Comment_122006833

Over temp trip is unlikely to become faulty, but it does not reset automatically,

The normal thermostat is known to become faulty, and it can be replaced fairly easily on some immersions, some are not replaceable.

My immersion failed completely and the terminals got really hot and that tripped the over temperature on mine. (Melty cables, no eddi just an immersion timer)

OO7FITZY

had a look at this - can't see a reset switch when I took the cover off

Immersion 1.jpg

Immersion 2.jpg

graememk

https://www.boards.ie/discussion/comment/122025169#Comment_122025169

Can't see it, could be new immersion time, it's a bit crusty!