What is the difference between X1-Hybrid-G3 “I Version” and “E Version”?

For X1-Hybrid series inverter provides two versions for customer to choose based on the local rules.
“I Version”means inverter has an build-in changeover switch. This version applies to the wiring rules which requires Neutral line of alternative supply must not be
isolated or switched.(applies to wiring rules AS/NZS3000:2014 of Australia and New Zealand.)
“E Version”means inverter needs to install an external changeover device for EPS function. This version applies to the wiring rules which allows Neutral line of alternative supply can be isolated or switched.( applies to most of the countries)