Sluggish Genset Start from Panel

The two new 6-volt house batteries were fully charged as indicated by the charge wizard pendant on the new PD9245 converter. After four unsuccessful attempts to start generator from the panel near the kitchen sink, the charge wizard indicated that house batteries were in boost mode (solid green LED) I used the emergency start switch on the dash and the generator reluctantly started. Maybe the generator starter is actually connected to the house batteries and the emergency switch on dash connects the chassis/engine starting battery momentarily in parallel. I have noticed that IF the generator does not start quickly from the panel, AND if I try two or three times more, the starter stops turning over. If the genset has been run recently, it may start quickly from the panel. Generator carb has been serviced and oil changed a few months ago. Generator starter turns over much more vigorously from the starter switch on the genset itself. Have been motorhoming since the late 50's but need better understanding of my Onan 4000 micro quiet generator.