v140822
Sun. Water. Life.
BERNT LORENTZ GmbH & Co. KG Kroegerskoppel 7, 24558 Henstedt-Ulzburg, Germany, Tel. +49 (0) 4193 7548 - 0, Fax - 29, www.lorentz.de
All specifi cations and information are given with good intent, errors are possible and products may be subject to change without notice. Pictures may
differ from actual products depending on local market requirements and regulations.
5
2 Introduction
2.1 Solar Pumping System Components
LORENTZ solar pumping systems can be applied to all
forms of daily use, water pumping for drinking water supply
for remote villages and farms without connection to the
water grid, for agricultural use such as livestock watering,
agricultural irrigation, forestry irrigation, pond manage-
ment, desert control, and industrial use such as wastewater
treatment etc. In recent years, with the promotion of the
utilization of renewable energy resources, solar pumping
systems are more and more used in municipal engineering,
city centre squares, parks, tourist sites, resorts and hotels,
and fountain systems in residential areas.
The system is composed of a PV generator, a pump and a
solar pump controller. Based on the design philosophy that
it is more efficient to store water rather than electricity,
there is no energy storing device such as storage battery in
the system. The system is prepared to be combined with a
elevated water storage, e.g. water tower or an uphill tank
installation.
The PV generator, an aggregation of PV modules connected
in series and in parallel, absorbs solar irradiation and
converts it into electrical energy, providing power for the
whole system. The pump controller controls and adjusts the
system operation and converts the DC produced by the PV
module into AC to drive the pump, and adjusts the output
frequency in real-time according to the variation of sunlight
intensity to realize the maximum power point tracking
(MPPT). The pump, driven by 3-phase AC motor, can draw
water from deep wells, rivers and lakes and pour it into
storage tanks or reservoirs, or be connected directly to the
irrigation system, fountain system, etc. According to the
actual system demand and installation condition, different
types of pumps such as centrifugal pump, axial flow pump,
mixed flow pump or deep well pump can be used.
Figure 1: Components of a solar pumping system
2.3 Technical Data
Model Pump motor:
rated power
Pump motor:
rated voltage
Solar input
power
Max. DC input
voltage
MPP voltage output current frequency
[kW] [V] [kWp] [V] [V] [A] [Hz]
PS9k 7.5 380 – 440 10 800 500 – 600 18 0 – 60
PS15k 11 380 – 440 15 800 500 – 600 24 0 – 60
PS21k 15 380 – 440 21 800 500 – 600 30 0 – 60
2.2 Product Features
LORENTZ PSk AC has the following features:
• maximum power point tracking (MPPT) with fast
response speed and stable operation
• digital control for fully automatic operation, data
storage and protective functions
• intelligent power module (IPM) for the main circuit
• LED display operating panel
• low water probe sensor
• protection level IP41
• ambient temperature for using: -10 to +50˚C.
CAUTION: Make sure to select the
appropriate controller model according
to PV module and motor load.
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