1. We usually size the system so that it pumps the full volume of water everyday. Thus, an 18,000 gallon pool in an area with 6 hours of full sun equivalent would need a flow rate of 3000 gallons/hour or 50 gallons/minute under full sun. Six hours of full sun equivalent (spread out over the whole day) is typical for much of North America during the summer.


2. Factor that affect the flow rate (and thus the system size) include the type and size of filter and the pressure required to running cleaning equipment. Sand and cartridge filters generally operate at a lower pressure than do DE filters. Suction side cleaners usually require less pressure than pressure-side cleaners including pop-ups. You can usually read the pressure side pressure of the pump at the pressure gauge on the filter. The total pressure is this plus the losses on the suction side.


3. Our pumps are medium speed pumps (2500RPM max) which operate at a variable speeds depending on the amount of sun. At full speed they will produce about 70% the flow (compared to a pump twice its size) at 50% of the pressure and requiring only about 35% of the power. Thus, if the system currently has a 1.5HP (low service factor) pump, it can usually be replaced with 3/4HP. Ditto for a 2HP being replaced by a 1HP and a 1HP being replaced by a 1/2HP.


4. Thus, if the total pressure is kept between 8 and 12 psi and there are 6 hours of full sun equivalent in your location, the following can serve as a rough guide:
   • 1/2 HP  for a pool with a maximum 14,000gallons (at 12psi) to 19,000 (at 8psi)
   • 3/4 HP  for a pool with a maximum 19,000gallons (at 12psi) to 23,000 (at 8psi)
   • 1 HP  for a pool with a maximum 27,000gallons (at 12psi) to 30,000 (at 8psi)

• 1/2 HP standard system with 510Wp of SunTech solar modules:  $3899
• 3/4 HP standard system with 780Wp of Kyocera solar modules:  $5489
• 1  HP standard system with 1020Wp of SunTech solar modules:  $6805

Options:

1. Ground fault interruption device (needed where the solar array is mounted on the roof of a dwelling): $230
2. Tile legs for use on a flat roof or the ground: varies from about $200 - $500.
3. Pole mounting hardware for solar array (pole not included): add $422 (1/2 HP), $569 (3/4 HP), or $928 (1 HP)

Prices are FOB Mesa, AZ (which means you need to add the shipping which is usually by truck) and are subject to change without notice.

Installation in Arizona may be arranged at an additional cost through Dependable Solar Products. Where installation is not required and outside of Arizona the purchase can be made directly from ETA Engineering, Inc.

---

Pool Pumping General

|

Pool Pumping Sizing & Pricing

|

Pool Pumping Product Specifications