The HIS (Delta Inverter) has multiple MPPT inputs. Just know that its output on most models is 4kW on grid / 9kW off grid. Check your model number as most people have E4_BDI, but some people have E10_BDI.
The system will also work with existing solar inverters (AC coupled).
Now if you don't already have the HIS, do not purchase it. There are much better options for solar and truck backup. Sigenergy is the best that is currently on the market and purchasable. Others are coming soon.
There were several options if you went to the sunrun site. What is or is not available any given day is another matter. I believe they had 4,6,8, and 10 kw inverters.