Choosing the right geyser solar controller

A Brief Comparison Of The Two Controllers

The Size Of Your Geyser

The starting point when deciding whether to use the Pi2R Micro or the Pi2R iX controller should be the capacity and power of your geyser. The Pi2R Micro would be suitable for a geyser of up to 150 litres with an element of 2 to 3 kW. Above that we recommend using the more powerful Pi2R iX, which can be used with a geyser of up to 300 litres and an element of 2 to 4 kW.

 How Quickly Do You Want It To Heat Up?

The Pi2R iX has close on double the power output capability of the Micro, so if you need it to supply power to heat the water quickly, then the iX is the natural choice. However, bear in mind that even though the controller may only be capable of supplying less power that what one could draw from the grid, it is supplying power continuously while the sun is shining whereas the geyser would normally draw full power from the grid in short spurts. This means that a unit with a lower output may well be more than sufficient for your needs.

Do You Want To Connect The Digital Display Unit?

If you would like to connect the optional programmable digital display touchscreen, then you need to opt for the GeyserTECH Pi2R iX as this option is not available for the Micro.

Do You Want To Use The System In An Off-Grid Setup?

Both units are capable of operating in an off-grid environment. Bear in mind that the Digital Display operates off a rechargeable lithium ion battery which is recharged by power supplied by the controller. This means that the battery of the display could run flat in conditions where there are extended periods without adequate sunshine. The controller itself, will however continue working normally within the parameters of available PV output.

I Would Like To Run Two Geysers Off One Controller 

This is only possible when using the Pi2R iX controller, but with certain restrictions. The main consideration here is that the maximum allowable power consumption is 4kW. This means that the total power consumption of the two geyser elements should not exceed 4kW i.e. both elements should be 2kW each to give a total of 4kW. Please contact us for advice on the best way of achieving a dual setup.

The Size Of The PV Array

The Pi2R Micro is capable of handling a maximum of 1500Wp of PV power at a maximum voltage (Vmp) of 200V. The Pi2R iX can handle up to 325Vmp at up to 15 Amps.