simi trucks run 12 hours at near full load, idle all night and then go again for 12 hours. Have for years with smaller alternators back then and bigger ones now. Although lately the led bulbs are lowering the load. They have run 150 to 200 amp alternators on them... Ambulances run a very very very heavy load... all the time... dual a/c units, inverters, and lots of lights.. They even leave lights on, engine off while at scene.. in the house, treating and loading the patients... then they restart on the second battery and the alternator then has to charge two batteries and run the 100 amp plus load... and in Texas heat.
On surburbans with dual ac units, seat heaters, mirror defrosters can run a 40 amp blower, 15 amp headlight, seat and mirror heaters of another 20 amp load plus engine all day while pulling a 15 amp high power stereo load.
Dont even get into buses with their 200 amp systems and huge triple a/c loads. Manufacturers have gone to two alternators when you start to exceed 200 amps. Its has shown up on fords on the ambulance packages now.
AND yes. alternators are made to charge batteries..
Using bulk mode, then trickle mode... however they dont have the third stage of maintenance or pulse mode ... temperature sensors allow even the charge voltage to change based on temps, that most home chargers dont have. This allows most modern cars to charge to a higher voltage when colder as needed to fully bring the batteries up to full charge. And.. if the battery is good.. max current will not usually exceed 20 minutes as the voltage will build up and the current will taper long before... The vehicle load however may not taper...
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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