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P a g e
About
The Solatherm control unit regulates DC electricity generated by a photovoltaic
array and applies it to a resistive heating element, located in a storage hot
water vessel, to generate hot water. The microprocessor constantly monitors
the water temperature in the storage vessel and energizes the heating element
when sufficient power is available from the array and the water stored in the
vessel is below the set temperature.
(Factory set temperature 60
0
or 70
0
Celsius)
When the temperature is reached the unit will turn the element off until the
water temperature falls.
Once the water is up to temperature, Solatherm units with diversion are able to
divert surplus power for another purpose such as battery storage. The
controller monitors the temperature of the stored water to ensure maximum
hot water is maintained.
Solatherm Control Units are independent from the grid and require no mains
power connection to operate, hence, the unit will only operate and display user
information when there is sufficient energy from the sun. It is normal for the
LCD display and lights to flicker or not fully display in low light conditions.
During periods of low solar input where there is insufficient power available to
heat the stored water to 60
0
C the independent 240V AC boost element will top
up the temperature of the water in the storage vessel.
NB: Generally the independent AC boost element is connected to an off peak
(controlled load) power supply. If only peak is available it is recommended to install a
din rail timer and set a heating period during the early evening and/or early morning
depending on the household demand. If the water in the storage vessel is higher than
the 60
0
C thermostat setting the unit will not draw any power as there is no need. If the
water is below 60
0
C during the set periods the boost element will top up the
temperature to ensure hot water is available. The boost element heats approximately
125L of water. Connection via a timer will maximise solar gain during the day, minimise
energy consumption and allow for ease of use. High usage households may require
extended boost periods or continuous mains connection to meet high demand.
