My 4.4 kw Westerbeke is acting strangely.
When first started up, it will charge the batteries at the maximum that the charger, Xantrex MS2000 will permit. As the batteries get charged, dropping from Bulk to Acceptance, to Float, the generator will drop voltage, from the 125v that it starts with, to around 100v, which the Xantrex rejects, as that is too low. When that happens, charging stops altogether.
I notice this a few tries in, and then started adding other loads as the charger reduced loads. That kept the voltage up and allowed the charging to continue. Now, with a space heater drawing furiously, out on the foredeck, it works. Until the heater turns itself off. I might have one at home I can substitute, without an automatic overheat shutoff, but I digress.
I need to get this fixed, but I have already taken it in, which I did 2 years ago, but the tech, armed with test equipment, couldn't make it misbehave, so nothing was accomplished. Then I added solar, so the generator saw almost no use last year. This year I added significantly to electrical loads, so needed the generator, so now I have more incentive to get it fixed.
Which part of the genset is malfunctioning, to allow the voltage to drop as the load drops?