Lorentz PS2-1800 Solar Borehole Pump and Controller

Lorentz PS2-1800 Solar Borehole Pump: Centrifugal and Helical Rotor Options

The Lorentz PS2-1800 is the most versatile system in the PS2 range, with 20 pump ends covering lifts from 8 m up to 250 m and flows from under half a cubic metre an hour up to 53 m³/h. That makes it suitable for everything from a deep livestock supply to a high volume irrigation lift, wherever there is no mains power. The controller runs from solar panels and has built-in MPPT, which keeps the pump working in poor light, and the pump has a maintenance-free, water-filled brushless DC motor in stainless steel. We supply the PS2-1800 in the UK as authorised Lorentz sales and service partners, and we size every system with Lorentz's own selection software.

The eight centrifugal ends (C-SJ) are the high flow choice, giving 3.0 to 53 m³/h at lifts of 8 to 140 m. The twelve helical rotor ends (HRE) are for deeper water and smaller flows, and reach up to 250 m. With this many options the right end is easy to get wrong by guesswork, so it is worth sending us your site details and letting the sizing software choose it.

The PS2-1800 costs from £2,565.17 ex VAT with a centrifugal pump end, and from £2,565.94 ex VAT with a helical rotor (HRE) pump end.

Which PS2-1800 pump end do I need?

The eight centrifugal pump ends cover heads from 8 m up to 140 m and flows from 3.0 to 53 m³/h. The twelve helical rotor pump ends reach heads of up to 250 m, at flows between 0.43 and 5.9 m³/h. The C-SJ17-2, C-SJ30-1 and C-SJ42-1 pump ends need a borehole of at least 6 inches (150 mm), and all the others fit 4 inches (100 mm).

Figures are the maximum for each pump end, from the current Lorentz datasheets (version 310270). The "H" ends are the high-head versions.

PS2-1800 controller and solar array

The controller handles up to 1.8 kW and accepts up to 200 V from the array, with a motor current of up to 14 A. It needs a maximum power voltage above 102 V, so the panels are normally wired in series strings. It is rated IP68 and works in ambient temperatures from -40 to 50 °C, and the pump can handle water up to 50 °C. The controller has inputs for dry running protection and remote control, an integrated sun sensor, and it is protected against reverse polarity, overload and over-temperature.

The PS2-1800 can also run from a battery, with a built-in low voltage disconnect, although about 99% of the pump systems we supply run direct from the panels with no battery. The controller is roughly 350 mm high, 207 mm wide and 124 mm deep, and weighs 4.4 kg. The pump unit, which is the motor and pump end, weighs between 11 and 15 kg depending on the pump end. The size of the array depends on the pump end, the head and the volume of water you need each day.

What is included, and what you need to add

The PS2-1800 price covers the controller and the pump unit, which is the motor and your chosen pump end. You will also need solar panels and mounting, a rising main and a storage tank, and we can quote for the panels and mounting as well. Cable between the controller and the pump is supplied if you need it, and is quoted by length. Sensors are optional extras. The Lorentz PS2 installation manual is available to download as a PDF.

Pump sizing with Lorentz software

Sizing is free. We size every pump with Lorentz's own selection software, using the details you give us, and the result is an estimate of performance based on that data. It is not a guarantee of output. We supply the equipment, and the installation is carried out by you or your installer.

To size your pump we need the borehole depth and internal diameter, the water level, the height the water must be lifted to and how far it travels, and the volume of water you need each day. Send those details through our solar pump enquiry form. For more on choosing a pump, see our guide to solar borehole and well pumps.

PS2-1800 solar pump FAQs

Which of the 20 pump ends do I need?

That depends on how deep the water is, how high it must be lifted and the volume of water you need each day. We run those figures through Lorentz's selection software and recommend the pump end for you.

How much water can a PS2-1800 deliver?

Up to 53 m³/h with the C-SJ42-1 at a lift of 8 m, falling as the lift goes up. For bigger flows, the PS2-4000 reaches 78 m³/h. For smaller flows, the PS2-600 is the usual choice.

Does the pump end change the price?

A little. The PS2-1800 starts at £2,565.17 ex VAT, and a few pump ends cost more, so we confirm the price once we know which one you need.

When is the PS2-1800 too small?

If you need more than 53 m³/h, or a lift beyond 250 m, the PS2-4000 reaches 78 m³/h and 450 m.