Not seeing any posts that could answer my question, I contacted Magnum technical support. They said no further separation is required. The Magnum will know to only put in any additional power required to maintain the charging profile (whether bulk, absorb or float) while on a generator, so it will share the charging/inverting energy input requirements with the Victron solar controller. That is what I thought would happen, but it was good to get a confirmation from an expert.