At 1 hour the battery voltage has only risen to 13.8V at a .2C charge rate. The .4C charge rate had attained 14.4V at 19 minutes.


If this was your alternator it had better be robust enough to deliver its full output for at least 1 hour straight. In this case, as you see next, 1:16 minutes before it starts to catch a break. A charge rate of .2C on a 450Ah bank, a pretty typical bank on a coastal cruiser these days, is an alternator that can deliver 90A continuously even when hot.







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