Backward compatibility with legacy pre-VE.Bus units
The control panel is backwards compatible with legacy (pre-VE.Bus) inverter/chargers running firmware versions 15xxyyy, 17xxyyy, and 18xxyyy. The transition from pre-VE.Bus to VE.Bus occurred from late 2007 to mid-2008.
For pre-VE.Bus systems, the control panel operation and setup align with the manual, except that the control panel does not automatically adapt to the system. The default setting is for a standalone inverter/charger with a 16A transfer switch, but if a different AC transfer current applies, the Scaling factor needs to be adjusted.