First, for the battery indicator with the row of LED's.. That can plug in to the booster-power supply, socket with no problem, it sips power (Few mA) and will not even be noticed by the booster or it's power supply.. DO NOT, however, plug in a trouble light, inverter or anything drawing more than a few amps.
The 50 amps, reffers to yoru 120 volt service, 120/240 volt at 50 amps is POSSIBLE if the park provides it, that's 12000 watts of power. So I use up to four 1500 watt "Cube" heaters (These are what about six by 10 or inches or so)
NOTE: I put in heavy duty outlets for them however, I seriously do not trust what came with the RV for that kind of load save for the washer/dryer socket (Which I use for one of 'em)
If you want to know how much battery you have.. You are going to have to tell us
Size of battery
How many
