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SGSC-02 Solar Hotwater Controller

NOTICE: SPLat Controls has moved. We are now at 1/85 Brunel Rd, Seaford, 3198. map


This is the Solar Hot Water controller that was originally manufactured for Solar Power Australia but has since been taken over by Astivita Renewables. By agreement, SPLat have been authorised to sell replacement controllers.

SPLat are not plumbers. We do not make hot water systems. We were only asked to design and manufacture this controller by Solar Power Australia. We don't know how to replace your pump. We don't even know what a pump looks like. If you have a problem with your controller, we can sell you a new one but we can't fit it. We want to help you though, so here is some stuff that may help you or your electrician or your plumber figure out the problem.

By the way, please ensure any work done with the controller is performed by a licensed electrician. Mains voltages are present and dangerous.

This controller is not for new designs. It is only intended to be used as a spare part and is fully interchangeable with the SGSC-01. If you're an OEM seeking a new control solution, we have experience and can help.


The controller measures the temperature of a roof mounted collector and the temperature of a water storage tank. When the tank temperature is low and the collector is hot, the controller will turn on the pump to recirculate water from the tank through the collector. Water passing through the collector will be heated from the sun.

If the water in the tank is already hot, then the pump will not run regardless of how sunny and lovely the day is.

This system is not a pure solar system. It is a boost system that aims to reduce but not eliminate gas or electricity use. It is most cost effective with paired with an off-peak electric system, where solar will be the only source of heat during the day and electricity will be used at night.

Temperature Sensor Inputs

The controller requires either 2 or 3 temperature sensors, depending upon the type of tank.

The required sensors are_NTC 10K Ohm 1% 3435 Thermistors. These are available from a varienty of sources including eBay , Alibaba, etc.

Indicator LED

The indicator LED may help diagnose faults. It indicates the following things:

Solar Hot Water Controller
  • 1+AUD68exGSTUSD≈52

Shipping weight:
150g / 5.3oz