I have 9 4x12 Heliocol solar panels in one single row on my flat roof about 16 foot off the ground. I have a Ecostar 3400 VS pump and 2" PVC lines to and from the panels. I would like to add 5 more panels in a new row to this system. Is the pump powerful enough to do this? How do I figure how many panels the pump will support? How do I figure out what speed to run the pump at?