Welcome to the forum, Tim.
I'm not a fan of tying in at the power distribution panel or any other place, other than directly to the battery.
I know guys that have taken the easy way and everyone of them went back to rewire it direct to the battery.
May be completely of the make, but it seems to me tying in at the distribution panel your solar will be trying to meet the 12V load and the battery will be deprived of a charge.
When I did my solar I built in expandability as well by sizing the wire I used from the controller to the battery. Paid off as I've added another panel and still have room to spare.
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Jim
When I was a kid I was going nowhere fast, now I'm an old man I'm going everywhere slow.
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