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  1. cygnusv

    I'm Looking for a Simple Switching Solution

    I have central heating throughout our boat, but it's never before been used to supply domestic hot water for showers etc. We've previously used mains (shore power) water heating with an immersion heater. Having just replaced our solid fuel heater with a bigger better model we now have sufficient...
  2. cygnusv

    A Question About PWM Controllers

    Hi All I'm updating the heating system on our boat. Currently we have a central heating circuit running from a back boiler in a solid fuel fire. I'm updating this system by replacing our small 5KW output stove to one which has better output, but more importantly also has a back boiler mounted...
  3. cygnusv

    What is this component fitted to my 24 volt pump?

    My boats central heating is controlled by a small Johnson 24 volt magnetic drive circulating pump. The speed of the pump is controlled by a pwm with attached thermistor fastened to the boiler outlet pipe. A week or so ago the pump speed went a bit haywire then the motor stopped. I traced the...
  4. cygnusv

    Reduce off grid freezer startup current?

    I've been reading on various websites about reducing the startup current required by freezers for off grid use. My freezer is Beko 'A' class Model ZSA 436 W 230 volt 50 Hz 55 watts and .25 amps. The freezer is about 12 years old I've just installed a Victron 1200 watts pure sine wave inverter...
  5. cygnusv

    Pipestat query

    I want to use the pipestat to turn a 12 volt circulating pump on at 30C and keep the pump running until water temp drops below 30C again. Whichever way I connect the stat it isn't doing what I want it to. There are 3 electrical connectors in the stat. As you may have guessed, I'm not a pro, just...
  6. 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...
  7. 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...
  8. 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...
  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?

    Hello again from the UK In preparation for our next (cold?) winter I'm finally hooking our boat's multifuel stove up to provide heat to 2 small radiators and using any excess heat to warm our domestic hot water tank. We live on board all year round. I've just ordered the back boiler for the...
  11. cygnusv

    Suggestions for replacement of an electromagnetic changeover relay

    Hello again from an electrical novice in the UK! My old (1951) boat has 24 VDC, 230 VAC mains and 230 VAC from a 1500 watt inverter. We are prone to mains power cuts on the marina (from time to time), and for that reason I installed a Siemens electromagnetic relay some years ago. It's simple...
  12. cygnusv

    Hi everyone

    I didn't see this section until I'd already asked my first question, so apologies for that My name is Stu and I live on a boat in Northern England and have done for about 13 years now. I am not practised in the dark arts of electronics and am here to learn more, and do more of my own smaller...
  13. cygnusv

    Using a Varistor to solve a back EMF problem

    Hi everyone, I'm new here and looking to solve a problem I have with burnt out contacts on my boat. The problem is with a 24 volt fresh water pump that was continuously burning out pressure switches. I partially solved the problem by bypassing the pump's internal pressure switch and using a...
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