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cuthound last won the day on October 13

cuthound had the most liked content!

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About cuthound

  • Birthday 19/01/54

Profile Information

  • Gender
  • Location
  • Interests
    Boating on Britains canals
    Motor sport (especially Formula One)
    Listening to music

Previous Fields

  • Occupation
    Retired (critical power & cooling project mgt)
  • Boat Name
    Delta Queen
  • Boat Location

Recent Profile Visitors

6,152 profile views
  1. How to stop being unmoored by yobs

    That is true, but when moored the rope should go the loop and around the pin, so that no strings is put on the loop when a passing boat pulls the ropes tight.
  2. Petrol engined vehicles also produce significant amounts of NOx, almost as much as Euro6 diesels.
  3. Portable radios

    So long as the fuse is at the battery end of the cable, not the equipment end.
  4. PRM 150 Gearbox Oil

    PRM now recommend oil changes for the 150 every 750 hours. I change mine every 2 years or 750 hours, whichever comes first.
  5. Modern "old" engines

    To deal with traffic ahead of him that is holding him up?
  6. How to stop being unmoored by yobs

    I find having a reactive GSD on board helps. He growls at every person passing on the towpath, and if they take too long in passing the boat , he goes into ferocIous barking and snarling mode. Not as effective as Tree Monkeys solution though
  7. CRT disgruntled staff

    I too have generally had good experiences of CRT and before that BW. The commentails you CRT staff do not surprise me. Generally people do not like change, and employees particular don't like change. As someone who rose "from the tools" to a senior management positions with BT, I experienced change management first hand. It takes many years and effective managers to change the culture of a company, particularly if like CRT and BT it had if like to roots in a nationalised industry where staff were generally sheltered from competition.
  8. Lucas 2v Traction Batteries ??

    We had charts for different battery types, showing the voltage to use for specific gravity ranges, corrected for battery temperature. This was back in the 1970's.
  9. Lucas 2v Traction Batteries ??

    In the early days of my career, charge voltage was manually controlled, checked and adjusted every 15-30 minutes (or soon error if our didn't want to maximise the overtime ). Another risk with too high a charge voltage is thermal runaway, although I have never seen this in practice.
  10. Lucas 2v Traction Batteries ??

    Yup, my experience is mainly with standby batteries. Standby or motive, the chemistry is the same, although plate construction and manufacturing methods differ. Standby batteries tend of do nothing, until a mains power failure, then supply the load until the gemerators start. Only so etimes the generators don't and the can go down to anything from 0 volts to 1.80 volts per cell depending upon whether the battery has low voltage cut off protection or not. On reconnection most modern critical power chargers are either multistage voutage dependent, particularly where the battery voltage isn't needed for the load (UPSs) or have a manual override to increase the voltage where one battery can be taken off load for charging to spwed recharge up (DCPP).
  11. Battery Monitors and Capacity

    Generally manufacturer's assess capacity at 25°C, (and then tell you that you will reduce life if you keep them above 20°C). Capacity increases with higher temperatures are tended reduces with lower ones. You are correct that the plates are really other fully formed when a battery is new are rend it takes up to 5 cycles to complete the forming process.
  12. Lucas 2v Traction Batteries ??

    Well 42 years experience with lead acid batteries in critical power applications, telephone exchanges, hospitals, banks, and data centres has show me you can get up to 95% in 12 hours and the final 5% takes another 12. Perhaps the US battery data comes from carefully controlled lab conditions? Back in the late 70's I had a colleague who had worked on diesel elecitric submarines, he reckoned they got battery charging down to 12 hours by bubbling compressed air up through the battery whilst it was charging. Apparently this prevented the hydrogen bubbles from collecting on the surace of the plates, which inhibits the chemical reaction between plate and electrolyte.
  13. CRT disgruntled staff

    I found that being retired freed up almost enough time to maintain my boat properly (almost but not enough) .
  14. Battery Monitors and Capacity

    First point, is the charger still in absorbtion charge mode (circa 14.4 volts) when you are reading 3-4 amps? Also having set the battery type and capacity, you need to periodically "synchronise" the BMV when the battery really is fully charged, by presting the + & - keys simultaneously for 3 seconds or longer. (It is supposed to automatically synchronise whenever the battery is charged to 100%, but as the capacity falls due to sulphation it does this less and less giving an incorrect reading). With regard to your second point, it depends on the kind of sealed battery. Better quality AGM's can be equalised, as can the cheapo sealed batteries which contain a wet electrolyte. With this type there is usually a sealed strip hiding the caps to the individual cells.
  15. Lucas 2v Traction Batteries ??

    Yes, but as you say the last 10% takes at least 6 hours, irrespective of the battery capacity. Years ago I used to charge 50 volt, 15,050Ah batteries from two 2000 amp rectifiers paralleled together, so a 4000 amp charging source. Still used to take 24 hours to fully charge a flat battery. That is why reasonably quick battery charging requires a charging source of about 25% of the battery capacity, to get the "early amps" in quickly. If you use a very small charging source, the battery will eventually charge but the first 50-90% will take an inordinately long time.