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  1. E

    PV immersion heater proportional control

    The unit in my house is generating too much hot water at this time of year, partly because I also had a solar thermal systems installed some years ago. What is the view on feeding combi boilers off the hot water cylinder? We have 2 gas boilers in our house and although the main boiler goes off...
  2. E

    PV immersion heater proportional control

    To avoid getting too far into this here I’d say both have their merits depends whether you need a ruggedly built well proven unit or one with a few more features. Contact the firms and compare them.
  3. E

    PV immersion heater proportional control

    The Intelligent Immersion i2 was also recently reduced in price to £199 and is now available with enhanced software that gives less export and a better looking but just as robust enclosure www.intelligent-immersion.co.uk
  4. E

    Immersun Perfomance Estimation

    The Intelligent Immersion Ltd model i2 and its prototypes and derivatives have been in service for up to 2 years now. We predated the Immersun. Several have comprehensive internet based monitoring systems on them so we are able to quantify their benefit. We have proved that the statement made by...
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    PV immersion heater proportional control

    Think you will find they only talk to a Wattson energy monitor. Their overall concept may work for mixit but I think you need to ask about long term reliability. Units like ours may have been criticised above for being hard wired in but when you look at a Wattson type product with sensors on...
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    PV immersion heater proportional control

    I am trying hard to restrict my posts on this forum to general discussion and not use it for advertising but you have forced me into it. See our website www.intelligent-immersion.co.uk If you use burst firing you may well get flicker. If you don’t you don’t. As we don’t we don’t.
  7. E

    PV immersion heater proportional control

    Sorry, nothing to do with me. Not our units. All I can say is that the Intelligent Immersion is well proven, reliable and does not use burst firing. And cheaper than many.
  8. E

    PV immersion heater proportional control

    Don’t understand the problem. Installation in that position is really simple unless there is no space there. PV installers are usually wiring in that region so adding a diverter is a trivial extra task. A totally plug in solution using 13 amp plugs might be easier but few immersions uses 13A...
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    PV immersion heater proportional control

    The Intelligent Immersion model i2 will do your basic function without flicker but we can’t do the extras that you ask for with the standard product. Certainly can look at it but I suspect that it would add so much to the price of any product that it would not be cost effective in terms of...
  10. E

    PV immersion heater proportional control

    The Intelligent Immersion costs less than that and there is stock available now for immediate shipment.
  11. E

    PV immersion heater proportional control

    Gavin In pre solar days the main loss I would have thought is in short cycling your boiler if you leave it on all the time. It may say fire up for just 5-10 minutes many times a day and in between the on times >95% of the heat in the boiler and pipes is lost/not useful in summer. Most people...
  12. E

    PV immersion heater proportional control

    The first prototype Intelligent Immersion was installed in mid 2011 and was followed shortly by many other prototypes. Some were connected to monitoring systems from late 2011 logging them every 5 minutes. The first production versions were in early 2012 but not in the II name. They are now...
  13. E

    PV immersion heater proportional control

    [/LIST] Just to be clear, by that I meant more export than the immersion can absorb because it is up to temperature or the export is over 3kW. Of course it can carry on powering the immersion all year round, albeit with much less export available to be absorbed in the depths of winter. At the...
  14. E

    PV immersion heater proportional control

    Here is some maths and some hard facts. Intelligent Immersion Ltd has done a detailed analysis of several of its proportional controllers that have been in service for more than a year, based on logging their power flows. It is concluded that a fair average figure for energy put into an...
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    PV immersion heater proportional control

    Those recent points cover a lot of different subjects like metering, EMC, safety, etc. On the smart meter subject: 1) My understanding of these is that their purpose is to know hour by hour, or more often, how much the house is consuming. Then different tariffs can be offered to encourage...
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    Immersion Heater - PV electricity

    In a not very scientific test I measured a 2 volt drop on my house with a DMM by turning on a 3kW kettle on and measuring the change in voltage at the consumer unit. I am only 200m and 16 houses from the substation. Using that figure (= 0.9%) and the above graph it shows that the switching rate...
  17. E

    Immersion Heater - PV electricity

    Excellent summary of the problem. I have built a couple of experimental burst fire controllers and installed them in 2 different houses. In both there was a significant level of lighting flicker, including neighbour’s lights, so I had to rapidly disconnect them. These were not houses at the end...
  18. E

    Immersion Heater - PV electricity

    Yes. My non-burst fire unit meets EN 61000-6-3 Electromagnetic compatibility (EMC). Generic standards. Emission standard for residential, commercial and light-industrial environments 2007, and BS EN 61000-3-3:2008 and EN 61000-3-11 for flicker. I suspect the original EMMA device did too...
  19. E

    PV immersion heater proportional control

    Problem with Immersun is it is a burst fire device and is not approved for installation because in most installations it causes an illegal amount of lighting flicker on all houses in the area. Also the electricity supply companies do not like burst fire technology so may later make it very...
  20. E

    Immersion Heater - PV electricity

    Not that familiar with the flicker regs but I believe that in industrial installations you can do an impedance test to prove it’s OK, but in domestic use not so. Unless your mains is almost a tenth of the standard impedance used in the spec I doubt even your house would be OK with a 3kW burst...

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