The system only requires few components and works in two versions:
The
first version can be completely prepared using commercially available
components.
Components:
rollable PV-cell, inverter, asynchronous motor (230 V AC) with centrifugal pump,
electrical leads, two hoses, a Sieve, two mounts for the pump threads.
A rollable PV-cell feeds the asynchronous motor of the
centrifugal pump. The
DC voltage of the PV-cell(s) (e.g. 24 to 40 V DC) is transformed by an inverter
to 230 V AC. If
the pump power should be reduced, you can just roll up the PV cell a bit or
partly cover it.
Advantage of this system: The 230 V AC can also be used to
feed into a home network or to operate other electrical devices.
The
second version requires a precise selection of components and more accurate
searches. In this
configuration you don’t need an inverter.
Components:
rollable PV-cell synchronous motor (about 30 V DC) with centrifugal pump,
electrical leads, two hoses, a Sieve, two mounts for the pump threads.
The rollable PV-cell directly feeds the synchronous motor (DC)
of the centrifugal pump. If
the pump power should be reduced, you can just roll up the PV cell a bit or
partly cover it.
The
downside of the whole concept is that the power of the pump can’t be higher
than 600 W with a budget of 1100 €. Therefore the flow is limited to about 3500
l/h. A
diesel -powered pump with approximately 3.8 HP has a flowrate of 22000 l/h. Unfortunately the
PV-cell-system can’t keep up with such a power. The main Reason are the
high costs of PV-cells. Currently
the rollable PV cells cost around 150 € per m² and have a minimum capacity of
80 W per square meter. For
my calculation I assumed 100 € per m² because this product is expected to be
ready for the market in about one year. And we will get it cheaper ordering
large quantities.
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