SV-D1000 displays with a serial number of 6000 and above (including all SkyView Touches) draw 6W, or about .5A at 13.5V, less than ones with lower serial numbers. We started shipping these roughly last summer. The lower power displays are part of the reason Van's was able to offer the dual screen option. Additionally, some earlier serial numbers that have SETUP MENU > LOCAL DISPLAY SETUP ? DISPLAY HARDWARE INFORMATION > HARDWARE VERSION 2 would also have the lower power draw (this is rare but worth checking).
Vans' engineering of the dual screen option is based on having two of the newer, lower-powered displays in the aircraft, as all new aircraft would have. In that configuration (with other changes like relocating the voltage regulator, as mentioned above), they've determined that they have the power overhead available to support the second screen in the RV-12
If you have one of the earlier serial numbers with the higher power draw and added a second new SV-D1000 or SV-D1000T SkyView Touch display, you would have be pulling 6W more than the design that Van's characterized.
Whether or not that extra half amp makes a critical difference against the RV-12's power budget is not something I can directly answer. I do know that it's not the tested configuration at Van's. One thing that OEMs such as Van's do is not use the "book values" for power consumption, but test actual installed configurations. In SkyView's case, for example, SkyView Network devices are powered by SkyView, and system configurations vary, the values we list in the manual for power consumption reflect the worst case configuration, but in a sport aircraft like the RV-12 that doesn't have every available option, the ACTUAL power consumption will likely be less. Additionally, know that adding the second display doesn't strictly double the power consumption, again because some SkyView Network components like the ADAHRS and EMS are already accounted for in the single screen configuration.
Michael Schofield
Marketing Manager
Dynon Avionics