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D5 Solar
The first DC spherical motor pump for directconnection to
photovoltaic panels with automatic performance optimization using
MPP technology (Maximum Power Point tracking)
Application
The Ecocirc solar pump can be used wherever a highly efficient
circulation pump is needed without a direct connection to AC power.
It can be connected directly to a photovoltaic panel and is
characterized by its small size, high efficiency, very low power
consumption and its MPP tracking. The shaftless spherical motor
technology enables a long, maintenance free and quiet service life.
Areas of application are thermal solar systems for single family
homes.
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Design
The principle of the spherical motor, which was invented by Laing,
is fundamentally different from conventional canned motor pumps. The
only moving part in a spherical motor is a hemispherical
rotor/impeller unit, which sits on an ultra-hard, wear-resistant
ceramic ball. There are no conventional shaft bearings or seals.
This rules out, in effect, the possibility of play in the bearings
and the increase in noise associated with it. These pumps are
particularly robust and give exceptionally long service. The
self-realigning bearing is lubricated and cooled by the media.
Maintenance is not necessary under normal conditions and even after
lengthy shutdown periods a reliable start-up is virtually
guaranteed. The parts exposed to the fluid are completely corrosion
resistant.Soft start-up
The pump has been programmed for a soft start-up. When the
photovoltaic panel provides sufficient power, the pump first goes
through the alignment phase, turning the rotor into the position
required for start-up. Then the processor waits until the built-in
capacitor has recharged sufficiently. This enables a start-up with
minimal power (less than one Watt). Cycling due to unsuccessful
starting attempts is minimized. Even after prolonged shutdown, the
pump will start reliably.
Automatic performance optimization – MPP tracking
The Ecocirc DC pumps are the first and only spherical motor pumps
with self-optimizing software (see diagram). Every three seconds,
the processor will modify its operating point on the voltage-current
curve of the PV panel to find the point of maximum performance. This
is called the “Maximum Power Point” (MPP).
At this point, the pump achieves the maximum rpm and therefore the
maximum performance. There is no need for a separate performance
adaptation, the pump will always find its best operating point under
any given light and temperature conditions by itself.
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Technical Data
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Motor design:
Electronically commutated, spherical motor
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Voltage Range: 8 to
24 V DC
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Maximum system
pressure: 150 PSI (brass housing), 50 PSI (plastic housing)
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Maximum Temperature:
230°F (brass), 140°F (plastic)
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Acceptable media:
Domestic hot water, heating water, water/Glycol mixtures and
other media on request.
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Pump Housing
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Common Applications
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Solar systems
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Computer cooling
systems
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Circulating systems
for homes, RV’s and boats
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Engine block
circulating systems
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Juice machines
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Aquariums and ponds
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Oxygen generating
systems
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Vending machines
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Water fountains
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Process temperature
control
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Remote area fluid
handling
Brochure
D5 Solar
Brochure (413KB PDF)
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Snap-out Design
Snap-out design of motor
drive unit permits motor replacement without draining the pump’s
fluid. No special tools required. The DC motor can easily be swapped
with an AC motor.
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