System components
6
Grundfos RSI
3
3. System components
An RSI system consists of a three-phase Grundfos
motor, an RSI solar inverter, and various protection
accessories.
The RSI system components include the following
components:
• a Grundfos motor
•an RSI
• a circuit breaker, AC (optional)
• a circuit breaker, DC
• a surge protection, DC
• a solar panel
• a dry-running switch
• a level switch (optional)
• a sine wave filter (optional)
• a combiner box.
Pumps
Pump requirements for an RSI system:
• The rated frequency can be either 50 or 60 Hz.
• The pump must be able to operate with a voltage
supply of 3 x 380 VAC or 3 x 220 VAC.
As standard, Grundfos three-phase pumps can only be
operated via an AC voltage supply. Therefore, the
solar panels must not be connected directly to the
pump but must be connected via an RSI.
Fig. 2 Grundfos pumps suitable for RSI systems
Renewable Solar Inverter
For a general product description, see section
1. Product introduction.
Fig. 3 RSI inverter
RSI combined with various sensors can offer the
following functions:
• maximum power point tracking (MPPT)
• DC to three-phase AC conversion
• connection to dry-running switch
• connection to level switch
• operating history inquiry.
Circuit breaker, AC (optional)
An AC circuit breaker is a standard circuit breaker
used for normal three-phase power connection
between the RSI output and the motor.
Sine wave filter (optional)
A sine wave filter is primarily used for protecting the
motor against overvoltage and increased operating
temperature. Output filters can also be used for
reduction of motor acoustics.
Solar panel
The solar panel offered by Grundfos is specially
selected for Grundfos RSI.
All Grundfos solar panels are equipped with plugs and
sockets enabling easy connection. The number of
solar panels required depends on the water quantity
required, water pressure required and installation
location.
Dry-running switch
The dry-running switch is recommended for
submersible pump operation. The switch can prevent
the risk of the pump operating in a dry well, which
could result in damage of the pump.
TM05 7729 1513 - TM06 1253 1914
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