Hi dstygar,
A picture of someone else's panel won't necessarily help you because there's no uniform layout.
The 20A breaker could be for the Power Converter. Check the battery indicator on your test panel with the breaker ON and again with it OFF. If it's the Power Converter, the indicator lights will go from 4 to 3 when the breaker is switched off.
The 15A breaker might be for something like the fireplace outlet. If you don't have a fireplace, you might not see any difference with the breaker on or off.