accessory controled inverter

hey guys

new to tacomas!

just trying to install a 3 way 12v socket (10A) and 120v (500w 30A) inverter in the bed of my 09. From the battery area i ran two : 12 and 8 gauge wires ti the driver bed storage box. they're in a exterior junction box waiting
but i need to know how to tap in a output that is controlled by accessory only so i don't discharge the battery . I will be installing a fusebox near the battery.

also, what is the "batt chrg" relay socket in the main fuse box?

i plan on passing the accessory feed thru a solar controller/relay to stop loads if battery is too low and maintain a trickle voltage charge on my battery (25watt solar panel) so having the

 

... wholesetup in a waterproof pvc box near the battery is a must.

thanks
sorry for the interrupted message! out in the woods and connection keeps dropping!

 

I was under the impression that the wiring for the oem bed receptacle was already there as part of the factory wiring harness, the only thing missing was the switch, inverter, and plug.

 

ok you are probably right but do you know what the wattage rating is? i want to get more wattage, a real 500w continuous... where can i locate the oem receptacle wiring?

 

Factory location is on the right side of the bed toward the rear.