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  1. Data from my mains powered fridge, model LA 120W: BEKO, 230V, 55W, 0.24A.
  2. £0.12/unit for power + £0.07/unit for service
  3. This post cannot be displayed because it is in a forum which requires at least 10 posts to view.
  4. This post cannot be displayed because it is in a forum which requires at least 10 posts to view.
  5. Over 3 years I am paying £3.7/month. 5 x 110Ah, lead acid batteries.
  6. https://www.youtube.com/watch?v=iO2a9I4VfDk
  7. https://images.mastervolt.nl/files/ManualIVETD030319EN.pdf This I believe, is the manual for the transformer, you may have this. The transformer is a toroidal type, which is more costly to manufacture, but better quality. Behind the cover is a circuit breaker which will be ok or you would see no power delivered. There is also a 'soft starter', this briefly pre charges the coils, before closing a contactor, to energise the transformer fully. It may be useful to have the soft starter operation looked at to check there is no snag with this. It will be a thyristor circuit board, connected to the bypass contactor. If you have checked all other possible causes, supplies, and loads; I would look at the transformer. This is a well made device, and probably costly to purchase so worth having it looked at. Come back if I can help further.
  8. Have you been able to isolate the cause? Generator, charger, etc; by switching circuits off. You are right, the noise is the transformer laminations vibrating, if this is ‘potted’ then this should be quiet. At 50Hz mains frequency a good transformer should be quiet, but loads and supplies many be working at other frequencies, which the transformer was not designed for. Also the enclosure may be ‘sounding’, removing bits in a ‘safe manner’ may provide a diagnosis. Tractor
  9. The generator supply, 230Volts single phase, may be square wave or a true sinewave, if it is a 'true sinewave', this should be ok. The charger will be making a supply from the generator 230 Volt output by switching transistors, these feed into a transformer coil to make the low Voltage DC; this could be making the laminations in the isolation transformer 'rattle'. Is the noise there when connected to a shore supply? If there is no noise from a shore supply, I guess it is the generator causing the problem. The isolation transformer will clean up a poor generator output to a point, but a PC supply may not work too well with a rough supply.
  10. With two phone accounts with 3, one a WIFI dongle, for cost saving I attempted to cancel one contract, this started a 6 week torrid time of conversations with 3. To mention a cancellation immediately put on hold for another department who could 'help' with this. Times on hold would vary between 11 minutes, a connection to an agent trying to sell me a new product, connection to an agent with a poor command of English, or complete disconnection. The local 3 shop, very pleasant, but could not manage a termination of contract, I did get a phone number of the Hutchinson head office in Glasgow, where Sarah, on the desk, said an 'executive' would call me back, a promise which failed to materialise. I was clearly not using the right technique for terminating a contract, but during this episode I thought I was loosing my mind. For anyone faced with dealing with 3, take notes of time, and date, and actions from the start; because as time progresses and frustration grows, you may loose the will to carry on. I have now cancelled both contracts, and signed up with GiffGaff. The relief is immense.
  11. Tractor

    A Horn

    Sad, but my Ferguson Te20 had to go to pay for the boat.
  12. Tractor

    A Horn

    I have a need for a low frequency, and fairly loud horn, electric powered, 12Volt. Any suggestions gratefully received.
  13. Employed some years ago using industrial components, the following was employed for an all-electric boat: Diesel generator 22kVA, acoustic enclosure, 230 Volt 3 phase, delta, operating at constant speed, keel cooling and enclosure exhaust provide the necessary heat dump. Inverter drive 18.5 kW, 230 Volt, 3 phase, speed control and direction via a small throttle lever. Motor, 6 pole, 3phase delta connected. Prop shaft coupling through flexi coupling, no gearbox required, providing a stepless speed range from zero to 1000rpm or greater. Surplus power available for cooking, washing machine, dryer, microwave, and ancillary loads. To bring this system to date for a ‘hybrid’ solution, would require batteries connected to the inverter drive, providing a Voltage operating ‘window’ of 180 to 260 Volts, qty 22 lithium ion cells, at some cost, with a suitable 3 phase charging system. The operating window between batteries and the inverter drive could be optimized with a DC/ DC system. A system of solar power would complete the package, to include a robust shore supply. The lower operating voltage would provide a system without the hazard of having 400 volts 3 phase, and all galley components would be standard domestic. Whilst deviating from the original question, this provided a working system which may help in principal, with anyone planning a diesel electric boat.
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