The E-Panel Lites come with a left-hand door, inverter breaker, pre-wired AC input and bypass, 500-amp/50mV shunt, AC terminal blocks, DIN rails, wall mounting brackets, instructions and lots of hardware.
UltraLite comes with a 50-amp AC input disconnect, 125-, 175- or 250-amp inverter breaker, ground busbar and the normal hardware and DC covers typically associated with E-Panels. They do not include an AC Bypass switch or AC and DC busbars.
Nottagutter accepts 2 UltraLites on top and 2 on the bottom, has bypass.