Originally Posted by Zanshin
I beg to differ - 6Kw is a significant generator. Without taking too many factors into consideration, let us take 6000W and de-rate by 10% for various losses. 5400W equates to a charging capacity of 450amps at 12V. Depending upon your battery bank size and battery type and charger you most likely won't be able to use all those amps.
If you have the Fischer Panda soft-start system, you can even crank up a Bauer dive compressor (running it is easy once the system is running). The genset will run 3-4 air conditioning units and could cool a 49 foot boat in the tropics (I had a 49DS in the caribbean with a 5Kw Fischer Panda which did the job).
You misunderstood what I was saying. The OP said he was only getting forty amps charging out of the generator. The standard alternator on the generator has a very small, I believe less than 10 amp alternator designed to maintain it's own starting battery. The generator is fully capable of running a large onboard a/c powered charger or charger/inverter. The boats in our fleet that have this generator are equipped with 2.5 kw inverter chargers capable of putting well over 100 amps DC into the battery banks. My point was that his charging issues with the generator have nothing to do with the generator and everything to do with the charger he has on board.