What’s the difference between On-grid inverter and Off-grid inverter?

Off-grid inverter(Figure 1 shows), by name of view, it is a kind of Inverter that not linked with Power Grid.
Solar modules will be sent electricity stored in the battery, and then through the off grid inverter to convert the DC power in the battery into AC 220V to load.
Similarly, On-grid inverter(Figure 2 shows)is that convert DC power sources from solar panels to high –voltage power, and then flow into the grid, but without the need of battery storage, this is the difference between them.http://www.jinhuasunrise.com/en/article/On-gridandOff-gridinverter.html
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