Electrical Setup questions

[Mountaindog]

I’m setting my 2010 Montana hickory edition fifth wheel up for boondocking.
I have an Onan 5500 generator on board. I installed two Renogy 12 volt, 200 AH battery’s wired in parallel. I then installed a Bogart Engineering TriMetric meter with a 100 amp shunt. ( I’m thinking I should had used a 500 amp) I also installed a Progressive Dynamics PD9280 converter.
Now the questions that maybe someone can help out with.
My usage readings on the meter seem high. I’m showing -1.4 amps with nothing on except the propane detector. I disconnected that and it dropped to -.7 amps. What else could be drawing juice? With the furnace running I’m showing -90 amps. This seems awfully odd since the furnace is on a 15 amp fuse. What am I missing?
I’m considering adding a couple solar panels yet but not sure how much help they would be since the majority of my boondocking camping is in oct and nov.