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About Col_T

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  1. Has anyone used a dehumidifier on their boat?

    I'm still finding my way through the wonderful world of electrics, but:- if it's 12v that's 15Ah, which would get a full capacity 110Ah battery to 50% DoD in about 4 hours; if it's 240v, that's about 18Ah, allowing for the inverter, which gets the 110Ah to 50% in 3 hours; if you're plugged into a shore-line then the batteries should be unaffected. More knowledgeable others will be along later or, more accurately, before me!!
  2. 12v electrical system

    Thanks for this Wotever. The VSR was fitted as the starter battery wasn't being charged when the boat was on shore power, and as the boat is really only cruised in the warmer months, I was concerned about the starter battery getting knackered, through lack of use, over the winter. As I've got the VSR now, I guess the least I should do is to fit the thing properly!!
  3. 12v electrical system

    Well, back again. I got one of these, http://www.12voltplanet.co.uk/voltage-sensitive-relay-12v-140a.html, and have fitted it so that the 'sensed battery' is the starter, which also means that the -ve connects to the starter battery -ve, and I am now having second thoughts about whether I have fitted it the right way round! The domestic bank comprises 5 maintenance free batteries, and the Sterling inverter charger is set for those. The starter battery is a wet lead acid which, I think, requires a higher charge rate that the domestics. The logic was that when the boat is on shore power, about 48 weeks a year, the starter battery will get charged first, and the domestics second. However, thinking about it more, when cruising the domestics will want much more charge from the alternators (starter has a 40 amp alternator, domestics a 70 amp) than the starter battery and I am now starting to wonder whether the starter battery will be charged enough to divert charge current to the domestics. My guess is that we cruise 4 or 5 hours a day. We don't have television or 240v appliances on-board; we do have a 12v fridge, most of the lighting is LED and phones only get charged whethe engine is running. Given the above, any comments on whether I should alter how the VSR is fitted would be welcomed!
  4. PRM 120 Drain Plug

    Thanks for this, Richard.
  5. The boat has a PRM 120 gearbox installed, and the workshop manual for the gearbox shows that the magnetic drain plug has a "bonded seal" between the gearbox housing and the drain plug itself. I am guessing that this seal should be replaced after changing the oil, but the manual gives no dimensions for this. So, can anyone advise the dimensions and material of the bonded seal, please?
  6. Bonding / Earth

    Excellent! Thanks, gentlemen.
  7. Bonding / Earth

    Apologies for high-jacking your thread, again!, Mohsen. I guess that an earth hull bond is usually a threaded stud welded to the hull. Would a bolt screwed through an internal steel upright work okay?? Before anyone mentions it, no, I don't mean the side of the hull!!!
  8. Continuous Cruising Car Cover

    Insurance companies use post-codes to evaluate the potential risk arising for any given policy. My guess is that the premium you have been quoted reflects the fact that you have told the insurance company that the vehicle will not be left in a single place over the term of the policy.
  9. Bonding / Earth

    Sorry, just about to talk borrow ! ! ! Is there a way of cancelling a draft reply?? Okay, thanks again for your help, Wotever. That's all from me.
  10. Bonding / Earth

    Not altogether sure I understand some of this so a couple of questions if I may:- Our boat has a connection from the inboard stud of the SafeShore GI to a hull mounted stud, and another, separate, connection from the casing of the Sterling Pro-Combi inverter / charger to the same hull mounted stud. Is this arrangement good, bad or indifferent? The boat has a Beta BV1505 fitted with a stud that has a -ve connection to all the batteries, the domestic and engine -ves being linked. Is this a sufficient DC 'hull bond'? Is the possibility of galvanic erosion decreased by fitting a new hull mounted stud and taking a cable from the -ve connection on the engine to the new stud? Mohsen, apologies for 'borrowing' your thread!
  11. 12v electrical system

    Okay, that's me sorted, so thanks very much for your help and advice. Colin T
  12. 12v electrical system

    Thanks for further info, chaps. The manual for the Inverter / Charger specifies 35mm^2, so I anticipate using that for the connections to the VSR. I've come across a manual and wiring diagram for a VSR that shows the negative going to a 'common ground', shown as the -ve bus-bar in the diagram. I'm thinking of mounting the VSR in the battery bay, and making the VSR -ve connection to one of the battery -ve posts, purely on the grounds of convenience. Would this be bad practice or otherwise frowned upon for some reason? Also, would either of the new connections to the VSR need to be fused? Finally, solar is something for the future but . . . presumably the idea would be to connect the output from the charge controller direct into the VSR?
  13. 12v electrical system

    Chaps, Given the second diagram as a starting point, I'm trying to come up with options that will allow the inverter / charger to charge both the domestics and the engine battery. The only thing that I can come up with is a new +ve connection from Dom 5 to the Motor Battery, but this would result in a single battery bank which isn't what I want. So, I could put an isolator switch into the new connection between the domestics and the motor - 'on' allowing current to flow between domestics and motor, for when the boat is on shore-line, 'off' separating them, for when we're not. I'm not terribly keen on that idea as it just complicates things, and I can practically guarantee it'll get left in the wrong position at some point. Other options, of course, include adding a new charger specifically for motor battery, and fitting solar to the boat. Given that the boat spends most of it's life in a marina connected to a shore-line this doesn't seem wholly appropriate. Any suggestions?
  14. Sterling inverter charger

    We have the 1500w version on our boat, and have had no problems with it at all. That said, we only use the boat some weekends and two or three times a year for a week at a time. Ours does hum, regardless of whether it's running in inverter or charger mode, but then the 12v fridge hums and creaks a little too - sometimes in a pleasant harmony, with the fridge doing the descant, sometimes in a discordant, modern jazz stylee when the fridge goes all creak, rattle and groan. Interesting place, our boat!
  15. 12v electrical system

    Thanks for that, Alan, which confirms that I, almost, understood it correctly. I used it in the sense "I don't have anything further to add, but may still pop-in to see if anyone has made a comment that improves my understanding a tad". On that basis, I'll say ta-ra for now, and y'all have a good day, now!