An "alternative coupling"?
Is it possible to "couple" (typically) grid tied and off-grid equipment at the DC PV panel connection(s)? Is there equipment that would allow simultaneous/parallel connectivity of both a typical off-grid charge controller AND an on-grid inverter to the same set of panels. This is not a theoretical musing as it is being done in the electric vehicle arena to provide V2G functionality - for bi-directional energy transfer to/from large EV batteries from solar and back to grid.
3850 watts - 14 - 275SW SolarWorld Panels, 4000 TL-US SMA Sunny Boy Grid tied inverter. 2760 Watts - 8 - 345XL Solar World Panels, 3000 TL-US SMA Sunny Boy GT inverter. 3000 watts SMA/SPS power. PV "switchable" to MidNite Classic 250ks based charging of Golf cart + spare battery array of 8 - 155 AH 12V Trojans with an APC SMT3000 - 48 volt DC=>120 Volt AC inverter for emergency off-grid. Also, "PriUPS" backup generator with APC SURT6000/SURT003 => 192 volt DC/240 volt split phase AC inverter.