Do not connect the clips to your 50 amp shore power cord. They should connect to your batteries like jumper cables, plus to plus, negative to negative.
You mention a three battery bank. Does this mean two house batteries and one chassis battery or three house batteries and one chassis batteries? In any case, the solar system should be connected to your house batteries unless you specifically want to charge your chassis (starter) battery. Just make sure you connect the clips to the battery terminals where the main cable to your rig are connected and not to the terminals that are used to connect your batteries to each other.
The solar suitcase doesn't have anything to do with your inverter/charger or your alternator.
In the future it would be helpful if you identify the model and year of your rig. It's a good idea to set up a signature similar to mine that contains this info so you don't have to input it each time you post.
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Bob C
2002 Itasca Suncruiser 35U
Workhorse Chassis
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