[bennelson]

Well, I don't have the right parts to do that right now.

I thought I would sit down and figure out what valves, drains, etc. I would need for charging the system. Then I would thread/solder them all together, and mount them on a hunk of plywood or something else that I could mount up later for the finished system.

I would then just have the pump hooked up to the "solar in/solar out" of the tank, and pressurize the system using the the Harbor Freight pump and water.

Then I...... Doh!
I see what you are saying. I really need to dig up a flow measurement device, as I can no longer use a bucket and stopwatch.

I thought I would find the original version of that solar instal video and go through the system charging part, so I could remember all the components that are built together in their kit for charging the system.