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Overview
I wanted the ability to turn on my inverter when not in the camper, so I added a RF Relay.
Wired switch schematic
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RF Relay
I went with a keychain RF switch that has both a ON and OFF button.
QIACHIP Mini Wireless Remote Control Switch DC 6V 12V 24V 1 Channel RF Relay Latched Switch for LED Light, Car Battery ON/Off

Wiring
One side of the rocker switch has the battery's voltage on it so I used that as my power source for the relay.
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Pairing the Remote
To set this relay in latched mode, click the learning button 3 times on the relay and then push the ON button followed by the OFF button on the remote.
After that, you should be good to go.
References