07-24-2011 07:35 PM
07-24-2011 09:16 PM
07-24-2011 09:39 PM
07-24-2011 10:12 PM
I'll take you at your word that you're not trying to insult. I think there's merely a language issue. If I find your phrasing about the technical stuff, um, "imprecise" then perhaps I shouldn't also take you to task for what might just be the same imprecision in your other words, so my apologies for "jumping down your throat" again. :-)
I don't really want to use my own words, when this stuff is well defined technical material. I prefer just pointing people to Wikipedia and similar online references, where they can learn more for themselves.
In this case, charge is something measured in coulombs, or sometimes amp-hours, and Wikipedia's got lots to say about it. It is directly related to current, but it's not the same thing any more than distance is the same as velocity, and in fact the relationship between the two dimensions in each of those pairs is the same: charge is to current, as distance is to velocity. In each case, one represents "something", and the other the amount of something moving/changing per unit time.
I can't say what the "effect of charge under load" is, since the concept doesn't parse for me... I find it semantically meaningless, or perhaps just confusingly worded. If I had to guess at what you mean by it, I'd say that since batteries store charge, applying a load (causing current flow, i.e. charge to flow out of the battery) results in a reduction in the charge over a period of time. That reduction can be measured as the difference between the voltage (which measures the "pressure" of that charge) at the start and end of that period. There, in my own words, that should say exactly what the wikipedia pages on charge, current, voltage, and such should say...
07-25-2011 08:48 AM
Okay, that helps. So we could say that when the battery has reached the maximum voltage (during charging), it's not "fully charged", and the controllers have to monitor the current to determine when they've shoved enough extra energy in that they can stop charging.
Not really. The voltage you see is the voltage the charger sees around the battery ; it does not materialize the SoC (state of charge). Chargers for Li-Ion batteries can work with constant Voltage (the graphic above shows that) or constant current. Here, the phase 1 is the first phase (where the battery receives a lot of energy), phase 2 is usually said to happen when the battery is charged at around 80% of its capacity, and the battery is considered fully charged when entering phase 3. at that point, the charger should not charge, except from time to time (phase 4) to bump a bit of energy into the battery (the top charging).
About the advise to top charge a battery, I am sorry I am not going to read all the pages of the website just for you
07-25-2011 08:55 AM
07-25-2011 10:19 AM
07-25-2011 10:38 AM
Sorry, I've lost track now what the point of the discussion was.
Well put, Peter.
07-27-2011 07:28 AM
07-27-2011 08:09 AM
Maybe it is the heat that matters? Dont think powerguru monitors battery temp.
MiataMike, it does record the temperature, but it's available only in the export file of historical readings, and not shown live onscreen at the moment.