seraphim wrote:
I'm looking for upgradable efficiency, and I think the higher voltage panel and mppt controller will help offer that. If I'm understanding things correctly.
The MS MPPT 15 will be maxxed out with any array over 200W. It will keep working but discard any charging Amps over 15A. So NO, not expandable. Not every MPPT is that smart. Some will shut down and others may even burn up if overloaded by the array.
Go larger with the MPPT controller if you plan on expanding the array Watts.
In my case, the 200+ panel would take all my roof real estate leaving no possibility of expansion.
HTH;
John