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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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