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10 minutes ago, flamegrilled said:

I would be perfect if I could use a solar tracker for the job of heating. I would use less solar panels for heating.

It is usually a lot cheaper to add more PV panels than erect a tracker.

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  • 2 weeks later...

Got some more info. The evacuated tube and PV install will be about the same price. +- R 21 000. (Yes if I do it myself it will be cheaper but I am afraid when adding the hospital bills it might not be cheaper anymore)

So on avg I use 18-20 KW per day and the geyser is between 4.5-7.5 KW per day. So about 1/3. My problem is I tried to work out my return on

investment and I couldn't see that I would save more than R 2 000 per year making it 10 year return. 

So my question would be is it still worth it or will a normal geyserwise timer save the same amount for cheaper?


Here's the usage broken down per day.


Here when the geyser goes on



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Depends on what you pay for electricity. You seem to be using about 2000 units per year. I pay R2.40 per kW. That would make ROI relatively shorter.

Your controls are in short bursts, you could open up a window of switching on and off.Also, your geyser comes on mostly at night, and neither PV or evacuated tubes will help with that.


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