I have a 24K gal inground pool that is 15 yrs old and has the original Sta-Rite Dynaglass MPRA6F-148L 1.5HP 230v pump, starite dual cartridge filter & gas heater. I have two skimmers and two returns plus a return for a buddy seat with a jacuzzi jet in each one, it also has a return line for a pressure cleaner I am no longer using since I replaced it with electric robot. I am considering adding solar heat, the pump is about 70ft from the house and would like to place the solar panels on the roof which is about 25ft to the roof. I want to replace the pump with either a 2 speed or Variable speed pump. I have no idea how much pressure I am gong to need once the solar panels are installed so I am wondering if it makes sense to spend the extra money on a VS pump to ensure I can dial in whatever I need to make all of this work properly or should I consider buying a separate pump just for the solar and get a 2 speed for the pool. Thank you.