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DaveGood

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DaveGood last won the day on June 14 2014

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  1. Just so you all know, After sixty plus responses and no useful information ( I'm investigating dmr's hints as to another thread where the holy grail may be found ). I can state that the majority of you have been well meaning, some of you have promoted yourself as bearers of knowledge you don't poessess, none of you have been useful ( with the possible, still to be determined status of dmr ). I consider this thread closed and will not look at it again. It has been of no use at all. DaveGood.
  2. dmr, I'm keeping an (amused) eye on you. This is a sixty plus thread, most of it we!l meaning waffle, some of it outright bull####, and the rest of it faux outrage that I dare question thier wisdom and knowledge. It's sixty plus waffle, BS, and grandstanding, zero on info and answers so far. I forget who it was who used the term "Non-Linear Relationship", a few posts back, (like he works at CERN ) in some kind of effort to demonstrate he knew what he was talking about, but I bet if whoever that was, if out of their sight for more then five days.... .....his mother, his wife, and his children will have forgotten him too. DaveGood
  3. Rob, I live aboard, off grid. No shorepower, on a boat where it is a complete b*****d to get at the batteries to measure SG and confirm the state of charge that way. My boat is my home, it's either under charge or providing power. I have to rip out the back cabin to get at the batteries. To begin with I assumed that the voltage drop of X amps on Y amphours of lead acid batteries, within reasonable limits, would be easily found info. After all, it's technology over a hundred years old. Try finding it! So far I've tried four major battery manufacturers, two won't answer, one thanked me for my interest, and the fourth told me it was "proprietary information". Next I went to a number of websites that concern themselves with (among other things) battery usage. Look back through this entire thread, there's something like sixty responses, not one of them an answer. A lot of them deploy carefully worded explanations as to why a simple, straightforward physcal\chemical process is far too complicated for me to worry my pretty little head about. Oh, and the people saying this don't have the slightest clue what they are talking about. So they'll start referencing stuff they've never measured but heard mentioned, "magnetic fields" or, "non-linear relationship" is a dead giveaway. If you wanted to know, say, the equivalent question in an equally old technology. Such as.... " How much fuel does a diesel engine, (something built from scores of moving parts) burn per hour to produce 1 HP?" You'd get a correct answer delivered in one short sentence from dozens of people in a few minutes. DaveGood
  4. Dmr, started the search, a shed load of possible threads. I'll work my way through every last one, And in advance, Thank you, DaveGood
  5. Dave Clinton If I place a fully charged battery bank of 440 amp hours under a ten amp load, what voltage drop will I see? If you know, tell us, if you don't, can you find out and tell us? If you can't do either,any contribution you make to this thread should have a higher entertainment quotient. DaveGood PS if the mods don't ban me soon, Betty Boo will as soon as she sees this thread.
  6. Loddon I read what you wrote, " roughly With no load and least two hours after charging..." Nicknorman, you made a very eloquent series of statements, which while useful, did not contribute anything I wasn't already aware of from my own reading, but utterly failed to answer the simplest of questions, if a battery bank of given amp hours is placed under a given amp load how much will the voltage drop? We all know batteries drop under load because we've all seen it. That must follow some basic physical law. But no, apparently I'll need access to a supercomputer to work it out while all smartgauge needs to work out SOC,a much more complex equation, is one number, voltage over time. You don't know now much a battery drops under load and you want me to believe it's fantastically difficult to work out, and would have no significance when calculating SOC if I did. DaveGood
  7. Good info Loddon, thank you, But now consider the case of livesboards who, for whatever reason, cannot shut down thier electrical systems for two hours, this time of year. I've met some. DaveGood
  8. Loddon, I know, or, not having one myself, accept from the evidence of others, that it is highly accurate, also highly expensive, there are useful solar panel systems out there that cost less. And I know there are many people on this forum who are not sure where to find the price of another two bags of coal to carry them through April, never mind be in a position to buy either a PV system or smartgauge. If I can work out a rough, rule of thumb method that will allow them to better manage their battery bank, without cost to them ,I will do so, but I'm getting no help here. DaveGood
  9. Loddon, Naughty Cal, Do either of you know how much fuel your engine will use on half power for eight hours? I bet you do, and if you don't it'll take you less then ten minutes online to find out what your engine should burn in that time. My question is the same, but applied to batteries. This is stuff we all should know. DaveGood
  10. If voltage drop under load is an inaccurate measure of battery SOC why believe the Merlin II or Smartgauge are accurate? They both take their main reference for judging battery SOC from the battery voltage whether under load or not. The arguement that you can take one or at most, two, parameters of any physical system and by subjecting that parameter to intense scrutiny over a long period of time you will gain a full understanding of the health of that system is a flawed one. I can monitor your blood pressure and your temperature second by second, it wouldn't tell me you were blind. All, I've done, here and other forums, is ask if anyone had any info on what voltage drop is normal for x amps applied to y battery bank. I've met with little but ignorance and disapproval. DaveGood
  11. I agree with you PaulC, and with Nicknorman. What I don't understand is why one of the most basic parameters of battery performance, voltage drop when under load, is regarded as a taboo subject, dangerous to bring up, and absolutely noone had any idea what the answer is. Not one person has come here, or on other forums I've posted to with an answer. But there have been plenty of people who, while, not knowing the answer themselves, have told me it's pointless to know and seem offended I asked. DaveGood
  12. By,eck The smartgauge gives a state of charge reading under dynamic load, so for that matter does your volt meter, your rev counter, and your temperature gauge. Which ones do you not trust when under "dynamic load", all, some, none? DaveGood
  13. Nicknorman, If monitoring voltage alone, and peforming repeated calculations on that single piece of data , is sufficient to give an accurate reading of SOC, (which is what Smartbauge does). Why does monitoring voltage and amps and temperature and voltage drop when under load give a less accurate or misleading result? Why does more information and greater knowledge lead to a worse outcome? DaveGood
  14. Perhaps so Keeping up. A piece of string can be any length, but an amp, a volt, an ohm, a watt cannot be changed to suit anyone's whim, or win an argument. DaveGood
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