With additional batteries I get a few hours max out of Skyview while soaring... Even with many devices powered off (such as ADSB470, servos, etc).
On long flights I sometimes even turn off the XPNDR, but only in class G e.g when running along ridges where radar doesn't see me anyway.
Wish list for Dynon:
1. Dim screen to very low. Dynon removed the ability to dim the screen a whole lot more, please bring it back for us power-challenged customers! Maybe via a setting that allows adjusting 'min. Dim level', high enough by default for power-pilots to not accidentally adjust screen to illegible levels...
2. Low-power Mode for SV e.g. Reducing the refresh rates of things to "glider pace" LOW speeds, or turning off the EMS (but not battery readings!) or similar
3. Maybe a bigger SV backup battery... I did resort to running down that emergency battery to extend my soaring :-?