Diego From Italy, joined Apr 2001, 135 posts, RR: 0 Posted (13 years 1 month 2 weeks 5 days 16 hours ago) and read 1518 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
Cdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 26
Reply 1, posted (13 years 1 month 2 weeks 5 days 12 hours ago) and read 1474 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
Chdmcmanus From United States of America, joined Mar 2001, 374 posts, RR: 2
Reply 7, posted (13 years 1 month 2 weeks 2 days 7 hours ago) and read 1418 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.