Having replaced an older vx1 display with an RDP 139 vx2 display, is the latter less susceptible to voltage drops as I may need to replace a failing UPS, not noticed any when using electric winches yet.
Vx2 basically uses the same power circuits as the NN1 with over voltage and under voltage protection. Replacing a NN1 and Vx2 will not change the requirement for good suitable power.