Here is my new system I'll test out:
12 hour run (8am-8pm), relying on solar cover heating, so running during day will hopefully improve sun heat...
RPM: 1800, power ~ 300W, flow ~ 28 GPM, total power 3.6 KW*hr/day
SWG Cell: 35% (Aquarite T-15)
target FC in morning ~ 4/5 ppm