Inverter In Caravan

Hi I have purchased a 380 Watt inverter from Jaycar for my caravan and the manual states " Connect an earth cable to the earth lug on the inverter "
Is the earth to the Ground (dirt) or the battery earth ??
The wiring diagram only shows the Inverter with Positive and Negative wires connected to the battery no earth wire !!
How have others earthed there inverters.

Cheers
Barry - Southern Cross Dreaming.
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