Quote:
Originally Posted by 3 Dog Nite
You'll find that charging the batteries with generator takes a long time if their power is low. Maybe 12-15 hrs. I start the engine & let it idle around 1000 rpm for 1 hr. This uses the alternator to charge them much faster while using less gas.
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The charge time depends on your converter and what charging algorithm it uses. My WFCO will charge my 4 grp 27 coach batteries from 50% charge to 90+% in about four hours.
I went through several alternators until I figured out that they were being burned out by running at full load for long periods. Now that I have a 220 amp alternator I have not had any problems.
I have a friend with a 40' diesel motorhome with a 120 amp alternator, his owners manual says that if you are going to start driving with discharged coach batteries you should run your generator to avoid burning out the alternator.