I need assistance with a system question…
I have a combination pool (25k) and spa (4 jets) with ground mounted solar panels (7 FAFCO panels (4' x 8') -top of solar panels are 10' above pool level)
System currently uses :
1 HP Northstar pump (SF is 1.85) with
Single 2” suction line (~20’ length to skimmer) and
Single 2” discharge line (~ 40’ to pool) with 5 eyeball outlets.
Solar panels are directly adjacent to the pump equipment - overall size is roughly 28 ft by 8 ft-
System includes a Pentair cartridge filter (300 or 400 sf), check valve and Lars heater
To reduce energy costs, I am considering replacing the single speed pump with a 2 speed pump; I am considering a Whisperflo WFDS 3 and 4 (or 24/26)
I am designing system for ~30 gpm in the filter mode (with solar) and 60+ gpm in the spa mode
My concern is related whether low speed pump discharge will have enough volume/head to overcome the static head to reach the solar panels.
Pump curves show shutoff head is ~20 ft which appears to show sufficient head to reach the top solar header
Your thoughts/concerns would be most appreciated-
Note: I am not ready to go to variable speed pump due to initial costs (would need any expensive upgrade of RS system to use these pumps)