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  1. E

    Immersion Heater - PV electricity

    Solar 24 is definitely not an Immersun. The Immersun is a burst fire device that is illegal because it does not pass the mandatory flicker specification, so can cause your and your neighbours lights to flicker. Because of this no one is allowed to sell or install them so why are you? The Solar...
  2. E

    Immersion Heater - PV electricity

    The longest top fitting immersion that fits is not inexpensive. Or if you live in a hard water area bite the bullet and change your tank for a taller or dual element one. It’s going to fail someday anyway due to the hard water.
  3. E

    Immersion Heater - PV electricity

    If you clear your PM box I can send you a PM
  4. E

    Immersion Heater - PV electricity

    There is another way to do this which is to just have the pump and a small 12V PV panel, no stats. Saves on mains power. When sunny the water is heating strongly and the pump runs. When half sunny it half runs to match the half heating. When no sun does not run. Need to match the panel with pump...
  5. E

    Immersion Heater - PV electricity

    Glad the units are working well. Some users have recommended this pump DC 12V Electric Centrifugal Water Pump 103 GPH (P-38I) | eBay Search eBay for P-38I pump if the link does not work. But it’s 10 times the flow needed so needs throttling or running for short periods. Smaller pumps that...
  6. E

    Immersion Heater - PV electricity

    As the device measures grid export only what happens when the load is turned on? Say export was 3500W and set threshold is 3500W, so when load turns on export becomes only 500W. To stop it immediately turning the load off again it needs to know that the load consumes 3000W. Is there a control to...
  7. E

    Immersion Heater - PV electricity

    What do you mean as not correct English? An immersion heater is 100% (or very close to it) efficient as almost every watt delivered goes to heating the water. Tiny losses in the connection terminals and wires plus heat losses through the cover could be taken off that. Say 99%.
  8. E

    Immersion Heater - PV electricity

    Partially true. My estimate that for a gas user a proportional controller saves £50 to £100. A switched controller is minus £30 to plus £30. £20 was a guess within that range. The minus is because, if you set it up badly you import more than you save, especially with 3kW loads. For oil, LPG...
  9. E

    Immersion Heater - PV electricity

    How does it relate to www.totalpowershop.com which seems to be same thing at higher cost with better website? Fundamentally though you have a problem in how to match the loads against the export. You can’t say rapidly turn on and off a washing machine to try to track the export as the machine...
  10. E

    Solar Panel immersion heater automatic switch.

    People think they can make something similar for a lot less but the reality is often that after few false starts they have a box full of discarded or blown up parts that, together with the parts that do make their way into a working product, end up costing at least £250. So it is fun designing...
  11. E

    Immersion Heater - PV electricity

    As well discussed here a couple of months ago these and some others like them are pretty useless. They do not track your export so are significantly under or over using your generation. If not well set you could be spending more money than you are today and have paid £150 for the privilege or...
  12. E

    Immersion Heater - PV electricity

    Some of the stuff on eBay from HK and China is OK but some not. I bought a simpler SSR for <<£10 from one such firm and it behaved in a very strange manner, so you might be lucky and might not. It will probably be opto isolated but maybe not with as high an insulation resistance as is really safe.
  13. E

    Immersion Heater - PV electricity

    I am not familiar with your design as not read all the thread but a SSR should drop about 1.2 V. So for every 1A flowing it is dissipating 1.2W which means a 3kW heater causes 14W of dissipation in SSR when fully on. That is not a lot but it does need a small heatsink of a few square inches. I...
  14. E

    Immersion Heater - PV electricity

    There is something seriously wrong with your design if it's coughing out that much heat. A good design will not do this.
  15. E

    Immersion Heater - PV electricity

    What happened to all the other pages of this thread? Used to be 50+ and now down to 22. Or are there just more posts per page now?
  16. E

    Immersion Heater - PV electricity

    Cuts out one sort of interference but replaces it with two others, one for zero crossing distortion and one for pulsing. Should be less overall but acceptability all depends on what regulations apply.
  17. E

    Immersion Heater - PV electricity

    But there is doubt expressed there that it legal to use burst firing at such high currents due to the electrical interference caused; may not be the medium frequency interference that phase control gives but the pulsation on mains is apparently not nice.
  18. E

    Immersion Heater - PV electricity

    Sorry, lost on me! What does that mean?
  19. E

    Immersion Heater - PV electricity

    I had been skeptical that daily basis was used, as how do they know the daily usage when meter is read quarterly at best and probably six monthly, with rest estimated? However I just talked to a couple of utility tariff experts at Uswitch like companies and they say the companies can but vary as...
  20. E

    Immersion Heater - PV electricity

    A lot of people posting here are asking me if they can buy one of my ready built units. The best offer I can make is to say that they should be available from back end of this year, unless you also want a PV system, in which case you can buy a PV system with my unit now. If you don’t want to...

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