I have a Powerpack 300, which is a 12v battery at 12Ah.
Using the AC adapter with the house outlet (20amp at 120v) it takes 17 hours to fully charge the battery. How would I calculate the (approximate) time it would take to charge the battery, using a solar panel that draws 1amp at 15v?
I have a Powerpack 300, which is a 12v battery at 12Ah.
Using the AC adapter with the house outlet (20amp at 120v) it takes 17 hours to fully charge the battery. How would I calculate the (approximate) time it would take to charge the battery, using a solar panel that draws 1amp at 15v (DC)?
"Northern Night Sky"
** Don't solar panels only work when the sun shineth brightly ??Any such predictions would have to involve detailed knowledge of the local weather, cloud cover and solar illumination levels.
Wouldn't it ?
.... Phil
The specs give a max expected charging time of 24 hours with nominal wall voltage and the supplied AC adapter. Since it looks like the adapter puts out DC and also that the charging circuit is a "smart" charger, then the time using the solar panel would be similar.
-- Rich Webb Norfolk, VA
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You still can get an approximate time of how long it would take to charge the battery, giving the variables I've provided...Duh! If I get 5 hours of sunshine/day, then I'll do the math in consequence. I'm still interested on getting the FORMULA, as per my original question.
"Northern Night Sky" "Phil Allison"
You still can get an approximate time of how long it would take to charge the battery, giving the variables I've provided...
** No you cannot.Fuck off, imbecile.
.... Phil
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The 12Ah is the capacity of the battery. 12 amp x hours. So if your solar charger provides 1 amp, then it will take about 12 hours. (Assuming the battery is fully discharged at the start.) What was the current rating on your AC adapter that took 17 hours?
george h.
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wow, what a typical answer from a Google Group! Your first answer was passive-aggressive, at best. Then, your second is even worst. Instead of telling me WHY it cannot work and educate me, you thought it was a more logical and rational ideal to tell me to "f*ck off". I don't think you know nearly as much about the subject, as you claim.
If the Maximum charging power is 1amp at 15v, on a 12Ah battery, I'm sure you can calculate the charging time.
Maybe I should go to some place more professional!
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THANK YOU George! The specs of my adapter are:
Input: AC120V 60Hz 16W Output: 13.5VDC 500mA
on 10/02/2011, George Herold supposed :
The charger according to the sales blurb supplies 500ma. The 20 amp 120 volt house outlet is useless and probably wrong information. Is not the normal US outlet limited to 15 amps?
-- John G
"Northern Night Sky"
** Drop dead - you PSYCHO f****it !!!17 r
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I neglected to consider the adapter rating. You're right, it's a 15 amp outlet, in a 20 amp circuit.
This a Usenet newsgroup, not a 'Google Group'. Just because you access it through Google doesn't make it theirs.
Phil is mentaly ill, but once in a while he's right to tell people off.
-- You can't fix stupid. You can't even put a band-aid on it, because it's Teflon coated.
Not necessarily. You can't just stuff a constant current into a lead-acid battery and expect it to be happy -- the usual method is to charge it at a constant current (depending on the charger's capabilities) until the voltage rises to about 2.4V/cell (with the exact amount depending on the battery and the ambient temperature) then holding the voltage constant and allowing the battery to accept as much charge as it can at that voltage.
Actual charge time then varies with both the charger's ability to deliver high current at first, and the battery's ability to absorb it later.
-- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html
I assume you mean that the solar panel _delivers_ (not draws) 1 amp in bright sun. If so, it can probably deliver 6 - 8 Ah on a sunny day.
If the battery is 12 Ah, and fully discharged, it will require about
15 Ah to fully charge it (batteries are not 100% efficient.). So, if the battery is fully discharged, it would take the solar panel two sunny days to recharge it. If you have cloudy days, it may take three or four days.-- Peter Bennett, VE7CEI peterbb4 (at) interchange.ubc.ca GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver.powersquadron.ca
"Peter Bennett"
** Congrats - the only reply that is even close to sensible.But the OP is a pig and deserves only swill.
.... Phil
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No problem, At 1/2 an amp times 17 hours you put a bit more than
8Ahrs into your battery. It wasn't discharged all the way. Which is fine if it's a lead acid .Phil A, knows a lot more than I do about electronics, but he's a bit.....
George H.
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Thanks Tim, I didn't know that. I figured his charger would take care of the messy details.
George H.
-- Sorry, but since there's no free lunch, that's just not true. Rule of thumb, as I recall, is that the charging efficiency of a lead-acid cell/battery is about 60%, so to get 12Ah into the battery using a 1A constant-current source which will take it to its terminal voltage will take about 20 hours.
local
-- Half an amp times 17 hours is 8-1/2 amp hours out of the charger, but due to efficiency considerations, that's not what you can get out of the battery at that point. Assuming a charging efficiency of 60%, in order to get 12Ah out of the battery you'd have to put in 20, and at a constant half an amp that would be 40 hours.
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