#1 July 21, 2015 21:16:26

arborlinden
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More than one I-Boost (or equivelant) immersion heater controllers

Since installation 27th June 2015 have gained the impression that most of our generation is being exported though an intelligent immersion heater controller saves some.
I am in the process of installing a hot tub as a sort of number 2 immersion heater but, ideally, I will need an intelligent controller to switch this on only when export is detected.
If anybody has done this or has any knowledge of how this can be done will appreciate any information. the installation of a second controller (my system uses an I-Boost though any make would do) might be the answer though I read somewhere that some controllers can feed two immersion heaters none appear to feed two on a priority basis.

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#2 July 24, 2015 16:20:19

pnews99@hotmail.co.uk
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More than one I-Boost (or equivelant) immersion heater controllers

i have a solarimmersion that has a relay inside which will will switch to a second load once the water is up to temp

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#3 July 25, 2015 08:11:42

SolarDave
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More than one I-Boost (or equivelant) immersion heater controllers

Hi, its too brr cold for a hot-tub at the moment!
the Immersun has 3 outputs and does what ‘pnews99’ notes for a similar product, which is to switch to a 2nd or for the immersun, a 3rd load, once the 1st heating source is up to temperature. I am directing the free solar pv energy to a space heater - which I was going to pack away in June, but with outside temperatures nor lifting above 16'c over past few weeks, the air heater is still on! Which is great as we have a nice warm house even though its a little cold outside! And our gas heating bills are lower, as I use the pv to warm the house. I wouldn't mind a hot tub though!

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#4 July 25, 2015 09:44:06

arborlinden
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More than one I-Boost (or equivelant) immersion heater controllers

SolarDave
Hi, its too brr cold for a hot-tub at the moment! the Immersun has 3 outputs and does what ‘pnews99’ notes for a similar product, which is to switch to a 2nd or for the immersun, a 3rd load, once the 1st heating source is up to temperature. I am directing the free solar pv energy to a space heater - which I was going to pack away in June, but with outside temperatures nor lifting above 16'c over past few weeks, the air heater is still on! Which is great as we have a nice warm house even though its a little cold outside! And our gas heating bills are lower, as I use the pv to warm the house. I wouldn't mind a hot tub though!

Looks like the I-Boost is an inferior product in respect of monitoring and using energy which will otherwise be exported compared with the Immersun and others. Part my fault for not doing sufficient research before commisioning my installation and part the fault of my installer who did not explain or was not aware of this option to get the best return from Solar PV.
The snag as far as the hot tub is concerned is that the Immersun and others are limited to 3kw outputs I believe and the tub I have ordered, though the manual is a little unclear, needs a larger supply capability.

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#5 July 25, 2015 11:09:24

SolarDave
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More than one I-Boost (or equivelant) immersion heater controllers

Hi Arbor, the Immesun website says this
Each immerSUN can utilise a maximum heater load of 3.2kW and cannot be connected to a greater heater load greater than this (ie immersion). notice the word each'.
What is the size of your array? if it is the std 4kw, then you won't see this value,except if you have the 16 panels all on the same roof - and that roof needs to be southfacing. I have our 16 panels, on 3 sides of the roof area, so my maximum is 3kw, so an Immersun is fine if this applies to your case.
Have u worked our how long it would take to heat a hot tub with a 3kw heater?

i'm not an electrician, but isn't 3kw the usual maximum power from a domestic supply? or is it the high current load that needs eg immersion heaters to be on a dedicated cable? my cooker only takes 2.8 kw to heat the main oven, when u would have thought it to be a higher power, so I think its the current requirement that is crucial for domestic appliances - would some one of a more secure electrical/electrician mind help out Arbor?

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#6 July 25, 2015 15:54:28

SteveRogers
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More than one I-Boost (or equivelant) immersion heater controllers

My iBoost looks like it will pay for itself in just over two years on saved electricity (through using hot tank water for the shower/bath rather than the instant demand shower) and oil (previously used to heat our hot water tank via the heating system). I am pretty pleased with this :-)

I know the i2 and Immersun are more efficient but they were also quite a bit more expensive and require more involved re-wiring. There were also problems reported with the Immersun and the household supply (can't remember what - blinking house lights or tripping RCDs maybe). The i2 needed an additional monitoring system to follow its performance whereas the iBoost has that included.

All-in-all, I do not regret choosing the iBoost.

Steve

Edited SteveRogers (July 25, 2015 15:55:07)

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#7 July 25, 2015 16:48:09

SolarDave
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More than one I-Boost (or equivelant) immersion heater controllers

Hi Steve,
i'm not sure why the storage element of eg Immersun or I-boost appears to be the way forward. SpaCE heatingis always going to be the winner, in terms of payback and reduction in your heating bills, if you say have a combi boiler. if you have a water tank, what is the cost of hot water per year as compared to the reduction in your gas bill from space heating. The water tank may never get to temperature, which means you need to add heat and hence gas or electric on top. I am expecting my immersun to pay back in 12months,because that is what I will save on my gas central heating bill, and the associated electric part of using the electric pump to punp hot water round the radiators. The problem with the Immersun is long past and relates to the former model which was revamped back around 2012. mine is 6 months and in use for 4 months, without a problem. no rcs or tripping has occurred. Hope this helps.

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#8 July 25, 2015 16:51:22

arborlinden
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More than one I-Boost (or equivelant) immersion heater controllers

SolarDave
Hi Arbor, the Immesun website says thisEach immerSUN can utilise a maximum heater load of 3.2kW and cannot be connected to a greater heater load greater than this (ie immersion). notice the word each'. What is the size of your array? if it is the std 4kw, then you won't see this value,except if you have the 16 panels all on the same roof - and that roof needs to be southfacing. I have our 16 panels, on 3 sides of the roof area, so my maximum is 3kw, so an Immersun is fine if this applies to your case.Have u worked our how long it would take to heat a hot tub with a 3kw heater?i'm not an electrician, but isn't 3kw the usual maximum power from a domestic supply? or is it the high current load that needs eg immersion heaters to be on a dedicated cable? my cooker only takes 2.8 kw to heat the main oven, when u would have thought it to be a higher power, so I think its the current requirement that is crucial for domestic appliances - would some one of a more secure electrical/electrician mind help out Arbor?
SolarDave
Hi Arbor, the Immesun website says thisEach immerSUN can utilise a maximum heater load of 3.2kW and cannot be connected to a greater heater load greater than this (ie immersion). notice the word each'. What is the size of your array? if it is the std 4kw, then you won't see this value,except if you have the 16 panels all on the same roof - and that roof needs to be southfacing. I have our 16 panels, on 3 sides of the roof area, so my maximum is 3kw, so an Immersun is fine if this applies to your case.Have u worked our how long it would take to heat a hot tub with a 3kw heater?i'm not an electrician, but isn't 3kw the usual maximum power from a domestic supply? or is it the high current load that needs eg immersion heaters to be on a dedicated cable? my cooker only takes 2.8 kw to heat the main oven, when u would have thought it to be a higher power, so I think its the current requirement that is crucial for domestic appliances - would some one of a more secure electrical/electrician mind help out Arbor?

`Thanks for your views SolarDave. My array is 5 kwp, a little more than a basic system but I still would not expect it to provide me with hot water; I have a 6kw gas boiler for that. What I have is an I-boost which, at least in the summer days when the clouds are not too extensive will divert some of the energy which otherwise would be exported for no return (the amount above 50% of my recorded generated output which is averaging at the moment about 20kwh a day) very little of which is being consumed on a working day. Diverting it to a space heater is one solution but the same sun which is generating the PV energy is also cooking the house so not an ideal solution.
You are right about hot tubs. I would not dream of expecting solar power to heat it up; it uses too much juice, so imported power will have to do for that or fill with hot water in the first place. however in the same way that solar power can contribute a little towards keeping the domestic hot water topped up it would be nice if the same facility existed for the hot tub which has the advantage over the hot water tank in that nobody is going to dump all that expensive hot water down the plughole; just give it a little boost now and then. Supplying the hot tub as a primary source solar could never do in the same way that an immersion heater whether or not topped up by solar could never cope with a busy household use of hot water as the hot tub has to have a primary supply of 32A on a dedicated feed wired up by an electrician.

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#9 July 25, 2015 17:15:28

arborlinden
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More than one I-Boost (or equivelant) immersion heater controllers

Steve Rogers
All-in-all, I do not regret choosing the iBoost.
Hi Steve. I do not regret having an I-Boost though the saving is marginal in our household and in many others I expect as a considerable change domestic routine is neccesary to take advantage of the unpredictable amount and timing of solar energy. Using a shower from domestic hot water instead of an electric shower is one way. I have both available but for ease of use the electric shower wins handsdown in my opinion. for most of the year there will not be enough solar energy to make much difference to the heating bill by sticking a space heater on the immersion controller which you can't do with the I-Boost anyway. Runing things like washing machines, dishwashers and clothes dryers means planning ahead and having someone to switch them on when the sun glasses come out. Few people I know are that organised. I have even considered ditching the separate washer and dryer for a washer/dryer so that the timer could be set to start it up when the sun is high and you could come home to clothes ready to be ironed. snags to this are cost of combined machine and getting one which will dry a reasonable wash load. Cost about £1000.00. Payback time if you remembered to do all the weeks washing midday instead of when you come home from work - 20 years maybe?

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#10 July 25, 2015 20:46:14

pnews99@hotmail.co.uk
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More than one I-Boost (or equivelant) immersion heater controllers

i have a 3.71 kw 14 panel system and usually have a full tank of hot water by 12 in summer with a 3 kw immersion and still looking for the best way of using the rest of the energy as the house is empty all day. was thinking a large electric rad would be best .
i agree the best way is to control appliances one by one but this is not possible so a small amount of back ground heat in winter .
as i am a electrician fixed wiring is no problem and i believe my solarimmersion will pay for its self in 2 to 3 years so everything else is a bonus

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