I'm not sure of the right terminology for what I am trying to ask about. Feel free to suggest a better question title.
Lets say that I have a fully charged LiFePO4 battery, which I do not want to charge any further, because it can damage the battery (e.g. float charging).
But the sun is shining, and the MPPT CC can provide 400w of energy, configurable at any voltage.
I want that the load draws as much power as possible from the CC, and the rest from the battery. I think the CC will drop the voltage when it doesn't have sufficient power, until it reaches an equilibrium voltage where the CC voltage is high enough to be the main source of current, but low enough that the battery provides the remaining current.
That solves the problem of load sharing with priority. I just set the CC voltage higher than the battery.
But because I don't want charging to occur, I either need to set the voltage lower (e.g. 12.7), or...?
I was thinking that perhaps I could set the voltage at 14.0V and switch the PMOS at a high frequency, and adjust the pulse-width so that current never flows into the battery (reverse polarity over the shunt). Without load, the pulse-width would be zero. With full load, the pulse-width would be 100%, the CC would automatically reduce its voltage while providing as much current as possible. But I'm also worried that some oscillation would happen, which would alternate between charging and not charging the battery. Perhaps I could program the controller, using averaging, so that an equilibrium state can emerge, with a pulse-width that doesn't allow any current to flow into the battery.
Is my thinking correct?