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  1. cygnusv

    Is this circuit fit for purpose if used on a 12vdc pump?

    I think Kris simply reversed the image, because I used the top image with the threaded end of the diode to the negative side of the circuit. Three years on it still works properly and it is still the original pump. Is everyone happy that this will work with 12 volts rather than the 24 volts it...
  2. cygnusv

    Is this circuit fit for purpose if used on a 12vdc pump?

    Three years ago KrisBlueNZ - RIP - kindly produced the following circuit for use on my 24 volt boat. The problem was back emf destroying contacts in the pumps pressure switch. This circuit completely solved the problem and 3 years later it is still in continuous use. 2 friends of mine are...
  3. cygnusv

    Security light proximity sensor fault ideas

    Excellent! Thank you very much..
  4. cygnusv

    Security light proximity sensor fault ideas

    Just bought a 20 watt security light. I'm in the UK and thought the supplier was in this country too. I fitted the lamp but the sensitivity wheel does nothing. The light only activates when my hand passes less than 100mm from the sensor. When I requested a refund or new unit I realised that even...
  5. cygnusv

    24volt inverter question

    I've just had a thought. Most vehicles and boats etc with 24 volt systems have alternators that charge at 28.8 volts peak. What is the point of an inverter set to a high voltage limit of 28.5 volts. Seems to exclude the inverter from anything but something like our Victron that can be adjusted...
  6. cygnusv

    24volt inverter question

    Apparently most deep cycle batteries prefer the higher voltage, and as stated, is what Trojan recommends. To answer another point made. 24 volt fridges and freezers are extremely expensive when compared to mains, hence our use of mains equipment. Maybe we'll have to stick to the lower voltage......
  7. cygnusv

    24volt inverter question

    My boat has 4x Trojan 6 volt batteries which gives me a small 225ah 24 volt emergency mains power backup at 230 volts. My original quasi sine wave inverter was obviously limited to what it could safely be used to power. For this reason, I want to upgrade to a pure sine wave unit. My problem is...
  8. cygnusv

    Wiring electronic ammeter / voltage meter

    Hi Steve, Many thanks for your advice, that clears things up for me. One thing though.. The output from the boat's alternator goes through the boat's ammeter to the battery banks. Is this also the case with this little electronic meter? Or do I wire from the mppt to the batteries direct, and...
  9. cygnusv

    Wiring electronic ammeter / voltage meter

    Hi Everyone, it's nice to be back! One of our projects this year is to fit solar power onto the boat. I've already got a new Victron 75/15 MPPT controller and I've just bought this little volt/amps meter. It's rated up to 30 vdc and 10 amps (ebay UK ref. 182428564437). We're 24 volts and the...
  10. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Har bloody har! I'm jealous! Lucky you. Though of course, you get more hurricanes than we do! Okay update. Very happy so far. Having sorted the odd leak out everything appears to be working well. The only questionable thing was 'is the thermistor working?'. The question was answered, by...
  11. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Hello again everyone Although we're not ready yet to fully report, I am very happy to say that yesterday we fired the system up and it worked! Before I report fully there are still issues that will affect the heating system use.. There is no insulation fitted yet, so a huge amount of...
  12. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    We're not currently able to trade up but...., Kath and myself (and our 2 cats) would be very comfortable indeed with something between 40 and 50 feet. We would require a beam (width) of around 12'6" minimum. It's amazing how easy it is to adapt. Here in the UK the cost difference (and taxes)...
  13. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Hello Hop, nice to talk Our boat is our avatar, top left of this reply. She was built on the river Thames and launched in 1951. She is mahogany on oak and is stabilised with a cast iron keel, a 'proper' boat. The avatar picture was taken in 1972 while she was making a north sea crossing from...
  14. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Hi Sunnysky Chris answered this, accurately, in the next post. I must admit I had to look up the word 'hysteresis' prior to answering you! Interesting though. Stu
  15. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    This does attract me very much. Add to this the fact that the whole thing, with the exception of the vented enclosure is ready to go. My belt and braces position is that because I can still operate the PWM manually if required, I can test it 'live' on the system once the pump is fitted. Also the...
  16. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    , Hey Guys! I'm not even thinking about room temperature. The boat you see in the top left hand corner of this post really is our home - myself and Kath;s (Gord bless her) - and has been for the last 15 years. We love our life aboard but the control aspect that you would associate with...
  17. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Hi Chris I've carefully soldered the wires and the cap. I think some kind of adjustment may be required to make this work properly. The pot itself appears to be working normally - as it was before the cap and the thermistor splice. At first I couldn't really tell if the thermistor was working...
  18. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Thank you for this. Having now received all the bits and pieces to follow advice given (gratefully rec'd) I'm going to test that approach first. Hopefully posting results soon. If there is not enough control I may have to come back and explore other avenues. Stu
  19. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Hi Chris Many thanks for your time and patience. Absolutely chrystal clear. I'll be back (here) during next week at some point with intermediate results using hot water and a 15 watt load. In a few weeks time we should have the heating up and running and I'll be able to report back again with...
  20. cygnusv

    How to control the speed of a 24vdc pump from circulating water temperature?

    Chris - You got me! I'm probably safer away from the PCB and will use a jumper between wires rather than risk roasting the board. I am ready but there will now be an intermission..... We're making good progress with the plumbing, but on a boat nothing is EVER straight forward. We've now got a...
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