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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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