Hi. Old pump is 1 HP, 1.65 Service Factor, 17,000 gallon in ground pool, 1.5 inch plumbing, Four 4X10 solar panels at ground level I recently installed with 2 inch plumbing to and from panels, old cartridge style filter (100 sq ft I think). Pump went out soon after panels installed. Pump lost prime and ran dry for some time, although it was working fine for several days prior. I couldn't get the pump to stop leaking so I think it's best to replace the whole thing, rather than just replace the motor portion.
If my pump uses 1.65 KwH per hour I figure I currently spend maybe $600 per year as the pump runs perhaps 3-4 hours per day average over the year. I am very happy with my water quality.
Pool store guy says that a 1/2 horsepower pump will move as much water as my very old 1.65 HP pump (15-20 years?) . Further, he says that the only pump which will work for me is a 1/2 HP pump due to the 1 1/2 inch water line. Anything larger he says is wasted because you can only suck so much water from the front of the pump.
Pool guy says he wants to talk me into variable speed pump. $1600 including installation (ouch). He says it will pay for itself fast but I don't think he realizes that I only run my pump a few hours each day and am happy with that.
Any help most appreciated!!