dwh
Tail-End Charlie
Is this sittuation bad?????????? or ok?
Non-issue.
They are only tied when the voltage is being pushed up above their normal resting voltage. It won't hurt the batteries to get some extra absorb time, and it would happen anyway if you were just driving.
The solar doesn't change that, it just increases the available amps a bit while driving. Whether or not the batteries can absorb more amps than the alternator can supply is a different question, and the solar might (probably will) end up doing nothing much with the engine running.
With a small solar system, it's when the engine is idling or off that the solar matters.