I would be interested to know if you went ahead with this purchase. If you did I would encourage you to invest the time to understand the electrical system's behaviors. I have been on somewhat of a crash course since becoming aware of this forum and now understand that there are several operator error's which will quickly create battery issues. These are enabled by the underlying components, not just the wiring.
This for instance should theoretically never happen, but as a new owner I created the situation and did not appreciate it's implication.
Sorry! several failed attempts to insert a picture of the inverter reading a battery level of 44%.
I think the battery balancer may reduce the chance of this happening, but may not prevent it. I don't know, because I don't have one and can't test it.