A couple more things to consider. 10 PSI at the solar pipe input does not include dynamic head loss which will drop the pressure at the VRV even further so you need to add a couple of PSI for that as well. As an example from my system, When the filter pressure is 15 PSI, the VRV pressure on top of the panels is about 2 PSI. I have a bypass in my plumbing system and when I bypass enough water to lower the pressure in the filter to 14 PSI, the VRV is about 1 PSI which is about a low as I would want to go. In fact, if I bypass any more water, the panels will not prime. So I would target 14-15 PSI at the filter.

Also, most IG pumps have enough lift to prime solar panels but not all AG pumps do so you have to be careful about looking at the pump's head curve to make sure the pump has enough flow at high enough head for priming. Based upon my own system, the pump needs to produce at least 45 GPM at 50' of head to prime 25' high panels.