If you have the original converter it only charges at 3 amps. You could run the genny all week and still not top off the battery.
No you don't have room for a bigger battery, I have switched all the lights to LED's to help some. BUT, the refrigerator eyebrow electronics on my 10 year old fridge uses 1/2 amp per hour.
With just the fridge on you are using 1/4 of your usable battery capacity per day. The best I am able to do is 48 hours then I charge a couple hours with the generator to get to about 90%. I have a new three stage 45 amp smart converter/charger.
Another big drain on the battery is the Propane Auto Shut Off Solenoid. If you still have one it is located right next to the LP tank after the rubber hose and before the metal pipes and the wires are connected to the LP detector near the floor somewhere, mine is below the refrigerator. The LP will not flow unless the LP detector is on and reset. Then this solenoid draws power all the time. If the LP detector alarm goes off it close's that valve and no LP will flow until it is reset.
Also if you have the original LP detector it probably is not working, they are only good for about 5-7 years. I tested my original with a lighter on with the flame out and it did not ever go off. My new one goes off in one second. Some people remove that solenoid and by pass it to avoid the power draw.
Some new rigs still use that safety device but I have never seen another one.
BTW Trojan makes a 100 amp hour group 24 deep cycle 12 volt battery. Most of the others are just 80 amps.
I carry a jump box to watch TV with a small inverter to extend my battery time.
Glad all went well with the running gear!
