I have a 12 Volt battery, 9.5 Ah that uses a 12 volt charger 1.0 amp.
Assuming the battery is completely discharged, is there a way to determine how long to charge ?
Thanks,
Andy
Charging time for 12 V battery
Started by ●December 24, 2012
Reply by ●December 24, 20122012-12-24
On Mon, 24 Dec 2012 13:02:57 -0800 (PST), andrew_kennedy7@yahoo.com wrote:>I have a 12 Volt battery, 9.5 Ah that uses a 12 volt charger 1.0 amp.I'll assume that it's an SLA (sealed lead acid) or AGM (Absorbed Glass Mat) battery. Makers and model numbers are a good thing to disclose.>Assuming the battery is completely discharged, is there a way to determine how long to charge ?Yep. Math. Incidentally, if your battery is completely discharged (i.e. zero volts), it's probably dead. A new lead acid battery has a Coulombic Efficiency of about 75%. That means for every amp you feed the battery, only 75% of it stays in the battery. 12v * 9.5 Amp-Hr / 0.75 = 152 watt-hrs will be needed to recharge the battery. If your charger actually delivers 1 amp, it will take: 152 watt-hrs / (12v * 1 amp) = 13 hrs This is under ideal and simplified circumstances. Coulombic charge efficiency varies from 50% to 98% depending on battery type and age. Your battery may not be completely discharged. Your 12v 1A charger (maker and model please?) may be capable of delivering a 1 Amp maximum, but will probably deliver much less while charging. SLA batteries just hate going over their rated maximum voltage. So, it's likely that the charger is set to a conservative voltage, that may not fully charge the battery. The charge current is also not constant over the entire charge cycle. Lots of variables, potential errors, and guesswork here. My wild guess(tm) is about 8-10 hours will be about right. Better to undercharge than to go over. I can make a more accurate guess(tm) when you find the makers and model numbers. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
Reply by ●December 25, 20122012-12-25
On Monday, December 24, 2012 3:02:57 PM UTC-6, andrew_...@yahoo.com wrote:> I have a 12 Volt battery, 9.5 Ah that uses a 12 volt charger 1.0 amp. > > > > Assuming the battery is completely discharged, is there a way to determine how long to charge ? > > > > Thanks, > > AndyPower Wheels Charger for Gray 12v Battery 00801-1778
Reply by ●December 25, 20122012-12-25
<andrew_kennedy7@yahoo.com> Power Wheels Charger for Gray 12v Battery 00801-1778 >** Always post links. DO NOT expect others to do the running around for you. And BTW - this is the WRONG NG for such a question. .... Phil
Reply by ●December 25, 20122012-12-25
On 12/25/2012 2:50 AM, Phil Allison wrote:> <andrew_kennedy7@yahoo.com > >> Power Wheels Charger for Gray 12v Battery 00801-1778 >> > > > ** Always post links. > > DO NOT expect others to do the running around for you. > > And BTW - this is the WRONG NG for such a question. > > > > .... Phil > > > > >That number shows up as several different devices. Don't think you have any choice but to measure what your charger does. I think your bigger problem is gonna be sulfation. The kids are gonna ride it until it stops dead. The next time you hear about it is next spring when the battery won't take a charge. I lost a set of electric scooter batteries because it got shuffled around in the garage and the power switch was turned on all winter. It might also be interesting to compare the calculated time to charge against the attention span of kids. Unless you want to pay close attention, you need something automatic.
Reply by ●December 25, 20122012-12-25
On Tuesday, 25 December 2012 11:50:30 UTC+1, Phil Allison wrote:> <andrew_kennedy7@yahoo.com > > > > > Power Wheels Charger for Gray 12v Battery 00801-1778 > > > > > > > > > ** Always post links. > > > > DO NOT expect others to do the running around for you. > > > > And BTW - this is the WRONG NG for such a question. > > > > > > > > .... PhilAutistic?
Reply by ●December 25, 20122012-12-25
orion.osiris@virgin.net wrote:> > Phil Allison wrote: > > > > <andrew_kennedy7@yahoo.com > > > > > Power Wheels Charger for Gray 12v Battery 00801-1778 > > > > ** Always post links. > > > > DO NOT expect others to do the running around for you. > > > > And BTW - this is the WRONG NG for such a question. > > > > .... Phil > > Autistic?Free lobotomy gone bad. Another of Dr. Frankenstein's failed experiments. :(
Reply by ●December 25, 20122012-12-25
> > And BTW - this is the WRONG NG for such a question.> .... PhilYes, this is the newsgroup for people down under to go on a Tourettes rant.
Reply by ●December 25, 20122012-12-25
On Tue, 25 Dec 2012 01:46:34 -0800 (PST), andrew_kennedy7@yahoo.com wrote:>Power Wheels Charger for Gray 12v Battery 00801-1778This might help: <http://www.modifiedpowerwheels.com/forum/topic.asp?TOPIC_ID=15855> About 14 hrs and no more, assuming a totally discharged battery. Looks like the Power Wheels fans are going for replacement chargers. I can see why as the stock charger appears to be a constant current charge with no automatic shutoff. Leave it on for extended periods, and you have a dead battery. <http://www.modifiedpowerwheels.com/forum/topic.asp?TOPIC_ID=695> <http://www.modifiedpowerwheels.com/forum/topic.asp?TOPIC_ID=4156> There's also some advice on batteries and chargers on the FAQ: <http://www.modifiedpowerwheels.com/forum/forum.asp?FORUM_ID=12> Looks like a good place to start reading. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
Reply by ●December 25, 20122012-12-25
On Tue, 25 Dec 2012 21:50:30 +1100, "Phil Allison" <phil_a@tpg.com.au> wrote:><andrew_kennedy7@yahoo.com >> Power Wheels Charger for Gray 12v Battery 00801-1778>** Always post links. > DO NOT expect others to do the running around for you.Yeah, that would be nice. However, I have a different formula for asking questions: 1. What problem are you trying to solve? A one sentence description is sufficient. Details can come later. 2. What do you have to work with? Hardware, software, versions, makers, models, photos, etc. Numbers please, not prose. Also test equipment available, level of expertiese, and such. 3. What have you done so far and what happened? There are plenty of other things that would be helpful, but these are the basics.> And BTW - this is the WRONG NG for such a question.Yeah, but I like off topic questions. It suggests that the OP is either clueless, lazy, or both. That makes it easier for them to accept my guesswork and pontifications. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
