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Post by tonyqj on Oct 31, 2016 13:28:06 GMT
From a >7 year old thread on CW where electrolysis was discussed it was concluded that 239kJ of energy is required to electrolyse 1 mole of water. Several references confirmed it. So you're about double that energy in your post above, Chewy.
1Ah of overcharge at about 1.2 volts will electrolyse 0.3cc of water.
Therefore the energy required is 239kJ, no?
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Post by tonyqj on Oct 31, 2016 13:09:31 GMT
Am I correct in assuming that your dad is currently in otherwise good health? If he isn't, or should he get to a poor state of health in the future then you need to be aware of the NHS continuing healthcare scheme where they will fund everything including nursing home placement. I wasn't aware of this facility until it was too late for poor mum. Details are here: caretobedifferent.co.uk/paying-care-home-fees/nhs-continuing-healthcare/
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Post by tonyqj on Oct 31, 2016 12:13:40 GMT
I went through much the same with my mum last year, who was also a long drive away (though nothing like your 6 hours), so I feel your pain. Now my cousin is experiencing it with my aunt. I also know how frustrating dealing with the council can be. I found AgeUK very helpful in giving advice. Plus mum's doctor. If you haven't yet contacted either of those I'd suggest it as a good first start.
I'll be thinking of you.
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Post by tonyqj on Oct 31, 2016 11:18:05 GMT
I agree with 1/ and, obviously, the repetition. As for 2/, how does an Ah counter count? Does it calculate the power output and divide by the (constant) voltage, or does it continuously measure current and just add it up? I'd guess the latter, in which case you may be right, but if it's the former then you're not. My guess is that you're correct, so excellent catch π Thanks for the write up Tony. Thank you ,also, for the way you have replied to critiques. '''Twas a different Tony responding to the critique. Confusing, innit? Tony
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Post by tonyqj on Oct 31, 2016 11:16:35 GMT
Thanks Tony, a great post. Having just installed one of these meters, I certainly think they require careful installation, setting-up and periodic calibration to get the best out of them. I am slowly learning to drive our one and currently find the ammeter to be most useful, something I have never had in the past. Arguably the most important electrics gauge on any boat and yet one of the least common.
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Post by tonyqj on Oct 31, 2016 11:13:51 GMT
The only posts I ever reported on CW were obvious spam or when someone had ended up starting two or more identical threads. I've also reported one here to D9 - just a request to merge two threads. He's since asked us if we'll make such future requests by PM. mmmm Are you sure, because if so I have been told porkies, PMs can be used to report or complain Yes I am quite sure. I don't tell lies, Graham.
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Post by tonyqj on Oct 31, 2016 11:07:08 GMT
Best solution I ever saw was to tap a couple of brass cable glands into the mushroom vent. I thought it a brilliant idea, least holes the better. I suppose they do chrome ones too if ypu are one of those new fangled shiny boaterΒ Β typesΒ What a great idea π
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Post by tonyqj on Oct 31, 2016 11:00:33 GMT
Actually just to add a serious comments to what was said in jest. I have never ever read anything on an internet forum that i have felt the need to 'Report'. It is akin to 'Telling Teacher' in my book. The only posts I ever reported on CW were obvious spam or when someone had ended up starting two or more identical threads. I've also reported one here to D9 - just a request to merge two threads. He's since asked us if we'll make such future requests by PM.
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Post by tonyqj on Oct 31, 2016 10:55:21 GMT
Happy 1st birthday Chris. π·ππ·ππ·π
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Post by tonyqj on Oct 31, 2016 10:46:06 GMT
I agree with 1/ and, obviously, the repetition. As for 2/, how does an Ah counter count? Does it calculate the power output and divide by the (constant) voltage, or does it continuously measure current and just add it up? I'd guess the latter, in which case you may be right, but if it's the former then you're not. My guess is that you're correct, so excellent catch π An AH counter measure current, using a shunt. It simply integrates the current to measure charge aka AH. Sure it has a +12 connection but that is only to power the instrument and allow system voltage to be displayed. If you connected the V+ connection to a different battery operating at a different voltage, the AH counting would be unaffected. In which case, good catch π
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Post by tonyqj on Oct 31, 2016 10:44:37 GMT
Really helpful stuff here - big thanks to all.. Will read up more in my breaks today! Laters! (With more numpty questions no doubt!) Tony B has just written a post about why Ah counters like the BM-1 tell lies - it might make an interesting read for you.
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Post by tonyqj on Oct 31, 2016 10:40:58 GMT
Hi Tony ...................................... 2/ In para 3 you talk about the battery getting warm as an indication that not all the AH go to charging the battery. This isn't really a good explanation since the heat does not necessarily mean that any AH are lost. Heat is caused by power/energy loss which is a result of voltage drop, not "current drop" since the latter doesn't exist! I'd have to check since I'm not sure, but does the process of electrolysing water into H and O2 intrinsically also create heat? Or is all the heat (as opposed to most of the heat) produced by volt drop? In other words, it is important to remember that current / charge has no dimension of energy or power. ..................................... Charging a battery takes energy, heating also takes energy, and you can only use it once, so electrical energy converted to heat is therefore not available to be converted into 'chemical' energy - ie charging the battery. So if you think 'energy' rather than volts and amps, then heat in this case is wasted energy. Yes, heat is undoubtedly wasted energy but is that energy counted by the Ah counter? It's an interesting point that I don't know the answer to.
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Post by tonyqj on Oct 31, 2016 10:39:16 GMT
Hi Tony 1/ In para 2 you mention "time before charging" when really it is "time before flat" I think - and normally one would want to charge before the battery is totally flat. Also the last sentence is very long without any punctuation. It is quite hard to understand! 2/ In para 3 you talk about the battery getting warm as an indication that not all the AH go to charging the battery. This isn't really a good explanation since the heat does not necessarily mean that any AH are lost. Heat is caused by power/energy loss which is a result of voltage drop, not "current drop" since the latter doesn't exist! I'd have to check since I'm not sure, but does the process of electrolysing water into H and O2 intrinsically also create heat? Or is all the heat (as opposed to most of the heat) produced by volt drop? In other words, it is important to remember that current / charge has no dimension of energy or power. 3/ Oh and everything is repeated, which makes it look much more daunting than it is! Got to go, more later maybe! I agree with 1/ and, obviously, the repetition. As for 2/, how does an Ah counter count? Does it calculate the power output and divide by the (constant) voltage, or does it continuously measure current and just add it up? I'd guess the latter, in which case you may be right, but if it's the former then you're not. My guess is that you're correct, so excellent catch π
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Post by tonyqj on Oct 31, 2016 9:00:46 GMT
never understood why peeps shag the pile. Β there are much more comfy things to shag in most homes. Reported. ππ
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Post by tonyqj on Oct 31, 2016 8:58:27 GMT
Sadly at present we don't have either the funds to purchase one nor the time to enjoy it. I'm ashamed to admit that the last year of our ownership of WotEver the longest trip it took was to the brokers. What area are you in? Nuneaton. So our cruising area for day trips was into Cov and back or down to Atherstone flight and back or up the Ashby & back! Longer trips could see us on the Oxford when the bottom wasn't too near the top.
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