User Manual

PowerOptimal Elon® 100 User Manual

Version date: 2022/06/28

Page 9 of 24

Version number: 2.15

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If you set the control dial to “SOLAR ONLY”, you can increase the geyser thermostat temperature

to 60 ºC to get maximum benefit from your solar array installation. We do not recommend setting

the thermostat temperature above 60 °C. Remember to reduce the thermostat temperature again

if you reduce the efficiency setting.

Warning: Do not set thermostat temperature above 65 ºC due to increased scalding

risk. Be careful when opening hot water taps located close to your geyser. You can install

a thermostatic mixing valve to reduce the risk of scalding – ask your plumber.

Please note: DO NOT install a separate timer on the AC side to try and regulate mains power use.

Use only the Elon’s control dial to control mains power use. If you install a second timer, it will work

at cross-purposes with the Elon and you will reduce performance and hot water availability.

2.4 Holiday settings

What setting should I use when I go on holiday?

You can either switch off both solar and mains power OR you can switch off mains power.

Setting

How to set it

Benefits & comments

Mains power

off

Turn dial to SOLAR ONLY

You will have hot water on your return,

and it will cost you nothing. It will also

prevent Legionella growth in your geyser.

Both Mains &

Solar power off

Turn dial to MAINS ONLY

and switch off geyser at

distribution board

Remember to switch system on when you

return.

2.5 How to maximise your savings

Control dial

The best way to maximise your savings is to set the Elon® control dial to “SOLAR ONLY”. This will

ensure that the unit will never use grid (mains) power for heating water. You can still boost with

mains power (for example on a cloudy day) by turning the dial to "MAINS ONLY" if needed.

However, the "SOLAR ONLY" setting will only be feasible if you have enough solar PV modules

for your household (see the table in Section 1.3 above).

For most people, setting the dial at "3" will yield the most savings whilst maintaining hot water

availability mornings and evenings.