Solar borehole pump technical specifications

Our range of solar borehole pumps consists of positive displacement and centrifugal pumps. All of these pumps come with a Maximum Power Point Tracking (MPPT) pump controller.

Centrifugal pumps are well known to deliver high liquid volumes at lower pressures than positive displacement pumps. Positive displacement type pumps are known for their high pressure, low flow applications.

Available models:

Motor:

DC brushless synchronous motor with permanent magnet.

Warranty:

1- year warranty

Controller features:

• Automatic stop/start.
• Soft start.
• Waterproof.
• Can withstand high temperatures.
• LED displays for power, current, rpm and error codes.
• The MPPT controller adjusts the pump's frequency and speed according to the sunlight available to optimize the pump efficiency.
• Automatic or manual rpm adjustment.
• If the well runs dry, the pump will stop for 10 minutes. Then it will start automatically to test again. No float switch needed for the centrifugal pumps. Float switch is included with the screw pumps
• Automatic dry-run (Centrifugal pumps only), low or high input voltage, high-current and high-temperature protection.
• Optional float switches can be installed to stop the pump automatically if the storage tank is full.

Maintenance:

Recommended maintenance after 3000 hours' working (500 days at 6 hours per day)

Pump Sizing:

The following spreadsheet tool can be used to determine which pump is required for a given borehole setup. Input the data required in the orange fields and choose the pump model from the drop-down list. The estimated flow rates will be given together with error messages if the pump will not work.

- Pump Sizing Tool

Solar Panel Configurations:

Each solar pump has a power rating which is the maximum power the electrical motor can supply for the selected pump controller. Each pump controller has a minimum and maximum voltage requirement in order for the pump to work. Hence, careful selection and configuration of solar panels is required in order to obtain the required power specification which not exceeding the maximum voltages.

The table below is a guide for (1) Maximum power and (2) economical options. All scenarios consider the pump required power, min/max voltage and a 66% usable capacity on the solar panels.

Panels are assumed to be placed in series (S) unless stated otherwise, two in parallel (2P).

Submersible Cable Selection:

Each solar borehole pump will require a specific submersible cable. The cable type (3-core / 4-core) will depend on whether it is a screw pump (3-core) or a centrifugal pump (4-core). The cable thickness (in mm2) is also dependent on the motor size and the total length of the cable. The total length of the cable will be the submersed depth of the pump and also the distance to the pump controller. 

The table below can be used as a guide on submersible cable selection. It is recommended to stay in the "green" zones for cable lengths.