Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Battery Vs Alternator  
User currently offlineDiego From Italy, joined Apr 2001, 135 posts, RR: 0
Posted (13 years 4 months 2 weeks 5 days 7 hours ago) and read 1575 times:

hi folks here I got another question that bugs me:
given for granted that the alternator feeds the electrical system and recharges the storage battery after start up once the engine is cranked, what is the purpose of recharging constantly the battery once it has been completely recharged and does the battery looses its charging by feeding somehow the electrical system during normal alternator operations?
Thanks REGARDS DIEGO

8 replies: All unread, jump to last
 
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 1, posted (13 years 4 months 2 weeks 5 days 3 hours ago) and read 1531 times:

OK..first for this conversation - let's call the alternator an AC generator/IDG. The battery charger is charged using AC power, so External Power or any AC generated power source can power the charger.
The charger can completely charge a dead battery, so lets say, we walk on an aircraft with a dead battery. It takes this aircraft an hour to completely recharge the battery. The charger will charge this battery at a certain rate. When its senses that this battery is fully charged, it will reduce the rate of its pulse to maintain 100 percent charge. It will not overheat the battery.

I think I spit out alot right there. I hope you can understand

Cdf


User currently offlineBoeingfan4life From , joined Dec 1969, posts, RR:
Reply 2, posted (13 years 4 months 2 weeks 5 days 2 hours ago) and read 1527 times:

try typing this in "search" this has been talked about before.

User currently offlineDc10hound From United States of America, joined Dec 2000, 463 posts, RR: 5
Reply 3, posted (13 years 4 months 2 weeks 4 days 6 hours ago) and read 1509 times:

>>The charger can completely charge a dead battery, so lets say, we walk on an aircraft with a dead battery. It takes this aircraft an hour to completely recharge the battery<<

On the A300, once the batteries are dead, it's over. The batteries must go to the shop for maintenance.
I believe it's the same on a DC-10, also.







"Eagles soar. But weasels never get sucked into jet intakes.."
User currently offlineKlaus From Germany, joined Jul 2001, 21520 posts, RR: 53
Reply 4, posted (13 years 4 months 2 weeks 4 days 3 hours ago) and read 1514 times:

Dc10hound: On the A300, once the batteries are dead, it's over. The batteries must go to the shop for maintenance.

Are you sure? Why is that? (Curious)


User currently offlineUkair From United Kingdom, joined Mar 2001, 284 posts, RR: 0
Reply 5, posted (13 years 4 months 2 weeks 2 days 1 hour ago) and read 1484 times:

Aircraft rely completely on their batteries for dc current so as the power in the battery is used up it is replaced by power from the ac generator get it?

User currently offlineKlaus From Germany, joined Jul 2001, 21520 posts, RR: 53
Reply 6, posted (13 years 4 months 2 weeks 2 days 1 hour ago) and read 1482 times:

Ukair: Aircraft rely completely on their batteries for dc current so as the power in the battery is used up it is replaced by power from the ac generator get it?

That´s what I was thinking and that´s why DC10hound´s remark baffled me. Shouldn´t it be possible to just recharge the dead battery in-site?

Unless by "dead" DC10hound meant DEAD, of course...  Wink/being sarcastic


User currently offlineChdmcmanus From United States of America, joined Mar 2001, 374 posts, RR: 2
Reply 7, posted (13 years 4 months 2 weeks 1 day 21 hours ago) and read 1475 times:

AC power is rectified into DC power through a Transformer-rectifier before charging the battery. There are two methods of recharging Lead acid and NiCad Batteries, constant voltage and constant current. Constant Voltage Re-charging is most commonly used in acft. When a Lead-acid battery is completely discharged, excess sulphation and plate shedding occurs which can lead to over charging and excessive heat. In NiCad batteries, full discharge may cause individual cells to reverse polarity and create an internal short. Most acft have a battery or charging relay in the DC elec system with a pre-determined minimum voltage to prevent the battery from being re-charged once the voltage falls too low.

Regards,
Chd



"Never trust a clean Crew Chief"
User currently offlineKlaus From Germany, joined Jul 2001, 21520 posts, RR: 53
Reply 8, posted (13 years 4 months 2 weeks 1 day 13 hours ago) and read 1478 times:

Ah, ok. So it was about deep-discharged batteries... Then it´s clear.

Thanks!


Top Of Page
Forum Index

Reply To This Topic Battery Vs Alternator
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
Vzrc Vs Vso: Attn. Bellerophon posted Sun Dec 10 2006 17:45:39 by Redcordes
Aircraft Vs Race Cars: Temps, Wear And Tear, Etc posted Thu Nov 2 2006 07:34:20 by TimePilot
DC-8 Vs 707 Today posted Tue Oct 31 2006 05:49:17 by DLKAPA
Airport Design - Arrival Vs. Departure Floor posted Wed Oct 25 2006 05:08:15 by Abrelosojos
HF Vs VHF Vs UHF R/T Frequencies Useage posted Fri Oct 20 2006 08:28:34 by BOACVC10
757 Vs 767 posted Tue Oct 17 2006 23:57:59 by Freight400
Rwy Capacity: Mixed Use Vs. Non-mixed posted Wed Sep 27 2006 02:27:28 by BuyantUkhaa
Engine Thrust: Rating Vs. Real Differences posted Sun Sep 24 2006 20:49:42 by A342
747 Vs A380-School Project; Need Help posted Tue Sep 19 2006 03:07:29 by Speedbird747BA
Skydrol Vs 5606 posted Sat Sep 16 2006 22:44:44 by DC8FriendShip

Sponsor Message:
Printer friendly format