The solar collector
The solar hot water system power supply
provides both controller and pump with 21 volts DC. The pump will start when
there is enough sunlight, which is measured by a sensor within the solar
collector. The signal is interpreted by a microprocessor controller, which also
controls the safety functions and a time delay.
Because the control operates on low voltage DC
it is suitable for operating from a small PV (photovoltaic) panel (see picture).
Deltasol controller for use
with mains powered systems
Control unit for use with PV powered systems
See a photo with