and, with a 20amp internal breaker, it basically means that's the amps you'll be limited to on the output, whenever you are off-grid and using the Inverter. If you have a sub-panel with two circuits, each 15amp, you'll be fine, as usually neither is using all of the 15amps at one time anyway, and it gives you the ability to split the outlets within two circuits.
(the same happens in your Main Panel, as the sum of all of the breaker AMPS total more than your 30amps that you normally plug into, or for larger coaches the 100amps they normally have access to.)
Since most breakers are of the minimum 15amp, it makes sense that our total of breakers will probably not ever equal exactly the maximum amps.
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