The batteries, which should be a matched pair, should show the same state of charge. You could always disconnect one at a time and eyeball your monitor to see if one of your batteries is not behaving properly.
There is a solar forum here that will tell you all you need to know though you may get a bit overwhelmed.
For reference, this is what I've done. I bought a 130W monocrystalline panel, Z brackets to hold it to the roof, a cheap PWM 20A controller, and some solar wire connectors--all from ebay. I bought 12 guage low voltage landscape wire from Lowes to hook everything together--the single conductor solar wire seemed inconvenient and a bit of a ripoff.
This gives me enough power for led lights, 2 showers every day, phone charging, occasional furnace just before bed (not all night), occasional radio, fridge on propane, and whatever other miscellaneous parasitic draws the TT has. I'm usually charged back up again by mid afternoon, longer if there's clouds. I've never had a problem, think I spent about $200 for everything.
Hope this gives you something to go on!
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2009 Jayco Jay Feather 17C 130W Solar, 2021 F150 2.7L Eco Boost, 2021 Toyota Highlander
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