That or if you have a single speed pump, buy a timer.
Timer helps, but it does not get close to the efficiency of a VSP. It's no a straight line from flow to power, it's a huge curve.
When you install a variable speed pump, you reduce motor speed and flow rate, resulting in reduced energy consumption. The Pump Affinity Law explains how the variable speed pump saves energy:
Speed = rpm (rotations per minute)
Flow = gpm (gallons per minute)
Power = W (watts)
The average single speed pump has a fixed flow rate of 3,450 rpm, while the average pool holds 25,000 gallons of water with an average turnover rate of 24 hours.
Let’s assume that a single speed pump takes 2,000 watts, operates at 3,450 rpm, and has a flow rate of 66 fpm:
(25,000 gallons / 66 gpm) / 60 minutes = 6.3 hours.
The single speed pump can turn over the entire pool in 6.3 hours at this rate, which would consume 12,600-watt-hours per day:
6.4 hours x 2,000 watts = 12,600 watt-hours (12.6 kWh)
A variable speed pump can operate with a flow rate of 22 gpm while only taking 116 watts. It may take longer to turn over the pool’s water, but it saves energy and money:
(25,000 gallons / 22 gpm) / 60 minutes = 19 hours
19 hours x 116 watts = 2,200 watt hours, or 2.2 kWh consumed per day.
10kwh per day improvement = 3650 kwh per year at $.12 per kwh = $438 in savings.
Stick to picking stocks, you are excellent at that.***