After looking at adding a Polaris 280 or a Pentair Legend for some time now I decided to investigate the use of a robot pool cleaner for auxiliary cleaning. I would have to add the 3/4 hp booster pump (I already have the plumbing for pressure side cleaner) to use the Polaris 280 or Pentair Legend and also run the main pump. I did some quick numbers on power consumption.
Main Pool pump is a Pentair 3050 3HP, Booster pump would be 3/4 hp
Assuming only using 1/2 load of the 3hp Pentair 3050 (3.2 kw X .5) = 1.6 kw per hour
Polaris or Pentair 3/4 hp Booster pump approximately 1.472 kw per hour
Assume 3 hour cleaning cycle: ( Main pump 1.6 kw + Polaris booster pump 1.472 kw) times 3 hours per day = 9.216 kw per day
Pumps 9.216 kw per day times 365 days = 3365.8 kw per year
Assume 14 cents per kw then 3365.8 times $0.14 = $471.21 per year electricity cost to run Polaris 280 or Pentair Legend using both pumps an additional 3 hours per day.
Most of the Robots use approximately 0.15 kw per hour
Assume 3 hour clean cycle for the Robot to make the comparison but normally only about 2 hours clean cycle required.
Robot 0.15 kw times 3 hours per day times 365 days = 164.25 kw usage per year
164.25 kw * $0.14 per kw = $22.99 electricity cost per year
Am I missing something here or is the operating cost $471.21 minus $22.99 = $448.22 less per year to operate a robot instead of a pressure side cleaner?
I have been looking at the Dolphin Supreme/Dynamic Plus 5/DX5 Plus, Water Tech Blue Diamond RC, or the Polaris 9400.
What is best bang for the buck with reliability Robot cleaner for gunite pools?
What is the normal life of the robot cleaner vs pressure side cleaner?
What is the normal average repair cost per year of Robot cleaner vs pressure side cleaners (pump and cleaner)?